pinctrl: move subsystem mutex to pinctrl_dev struct
This mutex avoids deadlock in case of use of multiple pin controllers. Before this modification, by using a global mutex, deadlock appeared when, for example, a call to pinctrl_pins_show() locked the pinctrl_mutex, called the ops->pin_dbg_show of a particular pin controller. If this pin controller needs I2C access to retrieve configuration information and I2C driver is using pinctrl to drive its pins, a call to pinctrl_select_state() try to lock again pinctrl_mutex which leads to a deadlock. Notice that the mutex grab from the two direction functions was moved into pinctrl_gpio_direction(). For several cases, we can't replace pinctrl_mutex by pctldev->mutex, because at this stage, pctldev is not accessible : - pinctrl_get()/pinctrl_put() - pinctrl_register_maps() So add respectively pinctrl_list_mutex and pinctrl_maps_mutex in order to protect pinctrl_list and pinctrl_maps list instead. Reintroduce pinctrldev_list_mutex in find_pinctrl_by_of_node(), pinctrl_find_and_add_gpio_range() pinctrl_request_gpio(), pinctrl_free_gpio(), pinctrl_gpio_direction(), pinctrl_devices_show(), pinctrl_register() and pinctrl_unregister() to protect pinctrldev_list. Changes v2->v3: - Fix a missing EXPORT_SYMBOL_GPL() for pinctrl_select_state(). Changes v1->v2: - pinctrl_select_state_locked() is removed, all lock mechanism is located inside pinctrl_select_state(). When parsing the state->setting list, take the per-pin-controller driver lock. (Patrice). - Introduce pinctrldev_list_mutex to protect pinctrldev_list in all functions which parse or modify pictrldev_list. (Patrice). - move find_pinctrl_by_of_node() from pinctrl/devicetree.c to pinctrl/core.c in order to protect pinctrldev_list. (Patrice). - Sink mutex:es into some functions and remove some _locked variants down to where the lists are actually accessed to make things simpler. (Linus) - Drop *all* mutexes completely from pinctrl_lookup_state() and pinctrl_select_state() - no relevant mutex was taken and it was unclear what this was protecting against. (Linus) Reported by : Seraphin Bonnaffe <seraphin.bonnaffe@stericsson.com> Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Patrice Chotard
Linus Walleij
Родитель
cb6d315dc3
Коммит
42fed7ba44
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@ -40,11 +40,17 @@
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static bool pinctrl_dummy_state;
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/* Mutex taken by all entry points */
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DEFINE_MUTEX(pinctrl_mutex);
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/* Mutex taken to protect pinctrl_list */
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DEFINE_MUTEX(pinctrl_list_mutex);
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/* Mutex taken to protect pinctrl_maps */
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DEFINE_MUTEX(pinctrl_maps_mutex);
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/* Mutex taken to protect pinctrldev_list */
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DEFINE_MUTEX(pinctrldev_list_mutex);
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/* Global list of pin control devices (struct pinctrl_dev) */
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LIST_HEAD(pinctrldev_list);
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static LIST_HEAD(pinctrldev_list);
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/* List of pin controller handles (struct pinctrl) */
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static LIST_HEAD(pinctrl_list);
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@ -111,6 +117,23 @@ struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
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return found ? pctldev : NULL;
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}
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struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np)
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{
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struct pinctrl_dev *pctldev;
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mutex_lock(&pinctrldev_list_mutex);
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list_for_each_entry(pctldev, &pinctrldev_list, node)
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if (pctldev->dev->of_node == np) {
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mutex_unlock(&pinctrldev_list_mutex);
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return pctldev;
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}
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mutex_lock(&pinctrldev_list_mutex);
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return NULL;
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}
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/**
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* pin_get_from_name() - look up a pin number from a name
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* @pctldev: the pin control device to lookup the pin on
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@ -170,9 +193,9 @@ bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
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if (pin < 0)
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return false;
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mutex_lock(&pinctrl_mutex);
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mutex_lock(&pctldev->mutex);
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pindesc = pin_desc_get(pctldev, pin);
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mutex_unlock(&pinctrl_mutex);
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mutex_unlock(&pctldev->mutex);
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return pindesc != NULL;
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}
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@ -269,15 +292,17 @@ pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
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{
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struct pinctrl_gpio_range *range = NULL;
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mutex_lock(&pctldev->mutex);
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/* Loop over the ranges */
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list_for_each_entry(range, &pctldev->gpio_ranges, node) {
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/* Check if we're in the valid range */
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if (gpio >= range->base &&
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gpio < range->base + range->npins) {
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mutex_unlock(&pctldev->mutex);
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return range;
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}
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}
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mutex_unlock(&pctldev->mutex);
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return NULL;
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}
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@ -361,9 +386,9 @@ static int pinctrl_get_device_gpio_range(unsigned gpio,
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void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range)
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{
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mutex_lock(&pinctrl_mutex);
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mutex_lock(&pctldev->mutex);
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list_add_tail(&range->node, &pctldev->gpio_ranges);
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mutex_unlock(&pinctrl_mutex);
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mutex_unlock(&pctldev->mutex);
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}
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EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
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@ -381,17 +406,25 @@ EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
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struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
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struct pinctrl_gpio_range *range)
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{
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struct pinctrl_dev *pctldev = get_pinctrl_dev_from_devname(devname);
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struct pinctrl_dev *pctldev;
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mutex_lock(&pinctrldev_list_mutex);
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pctldev = get_pinctrl_dev_from_devname(devname);
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/*
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* If we can't find this device, let's assume that is because
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* it has not probed yet, so the driver trying to register this
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* range need to defer probing.
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*/
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if (!pctldev)
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if (!pctldev) {
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mutex_unlock(&pinctrldev_list_mutex);
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return ERR_PTR(-EPROBE_DEFER);
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}
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pinctrl_add_gpio_range(pctldev, range);
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mutex_unlock(&pinctrldev_list_mutex);
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return pctldev;
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}
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EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range);
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@ -407,14 +440,17 @@ pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
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{
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struct pinctrl_gpio_range *range = NULL;
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mutex_lock(&pctldev->mutex);
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/* Loop over the ranges */
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list_for_each_entry(range, &pctldev->gpio_ranges, node) {
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/* Check if we're in the valid range */
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if (pin >= range->pin_base &&
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pin < range->pin_base + range->npins) {
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mutex_unlock(&pctldev->mutex);
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return range;
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}
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}
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mutex_unlock(&pctldev->mutex);
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return NULL;
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}
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@ -428,9 +464,9 @@ EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);
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void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range)
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{
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mutex_lock(&pinctrl_mutex);
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mutex_lock(&pctldev->mutex);
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list_del(&range->node);
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mutex_unlock(&pinctrl_mutex);
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mutex_unlock(&pctldev->mutex);
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}
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EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);
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@ -481,13 +517,13 @@ int pinctrl_request_gpio(unsigned gpio)
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int ret;
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int pin;
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mutex_lock(&pinctrl_mutex);
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mutex_lock(&pinctrldev_list_mutex);
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ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
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if (ret) {
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if (pinctrl_ready_for_gpio_range(gpio))
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ret = 0;
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mutex_unlock(&pinctrl_mutex);
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mutex_unlock(&pinctrldev_list_mutex);
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return ret;
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}
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@ -496,7 +532,7 @@ int pinctrl_request_gpio(unsigned gpio)
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ret = pinmux_request_gpio(pctldev, range, pin, gpio);
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mutex_unlock(&pinctrl_mutex);
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mutex_unlock(&pinctrldev_list_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
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@ -516,20 +552,22 @@ void pinctrl_free_gpio(unsigned gpio)
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int ret;
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int pin;
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mutex_lock(&pinctrl_mutex);
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mutex_lock(&pinctrldev_list_mutex);
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ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
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if (ret) {
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mutex_unlock(&pinctrl_mutex);
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mutex_unlock(&pinctrldev_list_mutex);
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return;
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}
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mutex_lock(&pctldev->mutex);
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/* Convert to the pin controllers number space */
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pin = gpio - range->base + range->pin_base;
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pinmux_free_gpio(pctldev, pin, range);
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mutex_unlock(&pinctrl_mutex);
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mutex_unlock(&pctldev->mutex);
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mutex_unlock(&pinctrldev_list_mutex);
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}
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EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
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@ -540,14 +578,24 @@ static int pinctrl_gpio_direction(unsigned gpio, bool input)
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int ret;
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int pin;
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mutex_lock(&pinctrldev_list_mutex);
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ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
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if (ret)
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if (ret) {
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mutex_unlock(&pinctrldev_list_mutex);
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return ret;
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}
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mutex_lock(&pctldev->mutex);
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/* Convert to the pin controllers number space */
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pin = gpio - range->base + range->pin_base;
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ret = pinmux_gpio_direction(pctldev, range, pin, input);
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return pinmux_gpio_direction(pctldev, range, pin, input);
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mutex_unlock(&pctldev->mutex);
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mutex_unlock(&pinctrldev_list_mutex);
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return ret;
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}
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/**
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@ -560,11 +608,7 @@ static int pinctrl_gpio_direction(unsigned gpio, bool input)
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*/
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int pinctrl_gpio_direction_input(unsigned gpio)
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{
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int ret;
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mutex_lock(&pinctrl_mutex);
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ret = pinctrl_gpio_direction(gpio, true);
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mutex_unlock(&pinctrl_mutex);
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return ret;
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return pinctrl_gpio_direction(gpio, true);
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}
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EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
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@ -578,11 +622,7 @@ EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
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*/
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int pinctrl_gpio_direction_output(unsigned gpio)
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{
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int ret;
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mutex_lock(&pinctrl_mutex);
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ret = pinctrl_gpio_direction(gpio, false);
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mutex_unlock(&pinctrl_mutex);
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return ret;
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return pinctrl_gpio_direction(gpio, false);
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}
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EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
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@ -685,14 +725,18 @@ static struct pinctrl *find_pinctrl(struct device *dev)
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{
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struct pinctrl *p;
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mutex_lock(&pinctrl_list_mutex);
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list_for_each_entry(p, &pinctrl_list, node)
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if (p->dev == dev)
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if (p->dev == dev) {
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mutex_unlock(&pinctrl_list_mutex);
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return p;
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}
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mutex_unlock(&pinctrl_list_mutex);
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return NULL;
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}
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static void pinctrl_put_locked(struct pinctrl *p, bool inlist);
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static void pinctrl_free(struct pinctrl *p, bool inlist);
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static struct pinctrl *create_pinctrl(struct device *dev)
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{
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@ -725,6 +769,7 @@ static struct pinctrl *create_pinctrl(struct device *dev)
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devname = dev_name(dev);
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mutex_lock(&pinctrl_maps_mutex);
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/* Iterate over the pin control maps to locate the right ones */
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for_each_maps(maps_node, i, map) {
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/* Map must be for this device */
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@ -746,13 +791,16 @@ static struct pinctrl *create_pinctrl(struct device *dev)
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* an -EPROBE_DEFER later, as that is the worst case.
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*/
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if (ret == -EPROBE_DEFER) {
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pinctrl_put_locked(p, false);
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pinctrl_free(p, false);
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mutex_unlock(&pinctrl_maps_mutex);
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return ERR_PTR(ret);
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}
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}
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mutex_unlock(&pinctrl_maps_mutex);
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if (ret < 0) {
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/* If some other error than deferral occured, return here */
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pinctrl_put_locked(p, false);
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pinctrl_free(p, false);
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return ERR_PTR(ret);
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}
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@ -764,7 +812,11 @@ static struct pinctrl *create_pinctrl(struct device *dev)
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return p;
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}
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static struct pinctrl *pinctrl_get_locked(struct device *dev)
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/**
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* pinctrl_get() - retrieves the pinctrl handle for a device
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* @dev: the device to obtain the handle for
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*/
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struct pinctrl *pinctrl_get(struct device *dev)
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{
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struct pinctrl *p;
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@ -785,21 +837,6 @@ static struct pinctrl *pinctrl_get_locked(struct device *dev)
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return create_pinctrl(dev);
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}
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/**
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* pinctrl_get() - retrieves the pinctrl handle for a device
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* @dev: the device to obtain the handle for
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*/
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struct pinctrl *pinctrl_get(struct device *dev)
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{
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struct pinctrl *p;
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mutex_lock(&pinctrl_mutex);
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p = pinctrl_get_locked(dev);
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mutex_unlock(&pinctrl_mutex);
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return p;
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}
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EXPORT_SYMBOL_GPL(pinctrl_get);
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static void pinctrl_free_setting(bool disable_setting,
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@ -820,11 +857,12 @@ static void pinctrl_free_setting(bool disable_setting,
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}
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}
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static void pinctrl_put_locked(struct pinctrl *p, bool inlist)
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static void pinctrl_free(struct pinctrl *p, bool inlist)
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{
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struct pinctrl_state *state, *n1;
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struct pinctrl_setting *setting, *n2;
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mutex_lock(&pinctrl_list_mutex);
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list_for_each_entry_safe(state, n1, &p->states, node) {
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list_for_each_entry_safe(setting, n2, &state->settings, node) {
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pinctrl_free_setting(state == p->state, setting);
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@ -840,6 +878,7 @@ static void pinctrl_put_locked(struct pinctrl *p, bool inlist)
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if (inlist)
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list_del(&p->node);
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kfree(p);
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mutex_unlock(&pinctrl_list_mutex);
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}
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/**
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@ -850,7 +889,7 @@ static void pinctrl_release(struct kref *kref)
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{
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struct pinctrl *p = container_of(kref, struct pinctrl, users);
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pinctrl_put_locked(p, true);
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pinctrl_free(p, true);
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}
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/**
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@ -859,14 +898,17 @@ static void pinctrl_release(struct kref *kref)
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*/
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void pinctrl_put(struct pinctrl *p)
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{
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mutex_lock(&pinctrl_mutex);
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kref_put(&p->users, pinctrl_release);
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mutex_unlock(&pinctrl_mutex);
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}
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EXPORT_SYMBOL_GPL(pinctrl_put);
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static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p,
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const char *name)
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/**
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* pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
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* @p: the pinctrl handle to retrieve the state from
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* @name: the state name to retrieve
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*/
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struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p,
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const char *name)
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{
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struct pinctrl_state *state;
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@ -883,26 +925,14 @@ static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p,
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return state;
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}
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/**
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* pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
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* @p: the pinctrl handle to retrieve the state from
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* @name: the state name to retrieve
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*/
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struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, const char *name)
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{
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struct pinctrl_state *s;
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mutex_lock(&pinctrl_mutex);
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s = pinctrl_lookup_state_locked(p, name);
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mutex_unlock(&pinctrl_mutex);
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return s;
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}
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EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
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static int pinctrl_select_state_locked(struct pinctrl *p,
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struct pinctrl_state *state)
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/**
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* pinctrl_select_state() - select/activate/program a pinctrl state to HW
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* @p: the pinctrl handle for the device that requests configuration
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* @state: the state handle to select/activate/program
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*/
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int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
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||||
{
|
||||
struct pinctrl_setting *setting, *setting2;
|
||||
struct pinctrl_state *old_state = p->state;
|
||||
|
|
@ -956,8 +986,9 @@ static int pinctrl_select_state_locked(struct pinctrl *p,
|
|||
break;
|
||||
}
|
||||
|
||||
if (ret < 0)
|
||||
if (ret < 0) {
|
||||
goto unapply_new_state;
|
||||
}
|
||||
}
|
||||
|
||||
p->state = state;
|
||||
|
|
@ -983,23 +1014,7 @@ unapply_new_state:
|
|||
|
||||
/* There's no infinite recursive loop here because p->state is NULL */
|
||||
if (old_state)
|
||||
pinctrl_select_state_locked(p, old_state);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* pinctrl_select() - select/activate/program a pinctrl state to HW
|
||||
* @p: the pinctrl handle for the device that requests configuratio
|
||||
* @state: the state handle to select/activate/program
|
||||
*/
|
||||
int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
|
||||
{
|
||||
int ret;
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
ret = pinctrl_select_state_locked(p, state);
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
pinctrl_select_state(p, old_state);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -1129,10 +1144,10 @@ int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
|
|||
}
|
||||
|
||||
if (!locked)
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
mutex_lock(&pinctrl_maps_mutex);
|
||||
list_add_tail(&maps_node->node, &pinctrl_maps);
|
||||
if (!locked)
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pinctrl_maps_mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1154,12 +1169,15 @@ void pinctrl_unregister_map(struct pinctrl_map const *map)
|
|||
{
|
||||
struct pinctrl_maps *maps_node;
|
||||
|
||||
mutex_lock(&pinctrl_maps_mutex);
|
||||
list_for_each_entry(maps_node, &pinctrl_maps, node) {
|
||||
if (maps_node->maps == map) {
|
||||
list_del(&maps_node->node);
|
||||
mutex_unlock(&pinctrl_maps_mutex);
|
||||
return;
|
||||
}
|
||||
}
|
||||
mutex_unlock(&pinctrl_maps_mutex);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -1196,7 +1214,7 @@ static int pinctrl_pins_show(struct seq_file *s, void *what)
|
|||
|
||||
seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
mutex_lock(&pctldev->mutex);
|
||||
|
||||
/* The pin number can be retrived from the pin controller descriptor */
|
||||
for (i = 0; i < pctldev->desc->npins; i++) {
|
||||
|
|
@ -1218,7 +1236,7 @@ static int pinctrl_pins_show(struct seq_file *s, void *what)
|
|||
seq_puts(s, "\n");
|
||||
}
|
||||
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1229,8 +1247,9 @@ static int pinctrl_groups_show(struct seq_file *s, void *what)
|
|||
const struct pinctrl_ops *ops = pctldev->desc->pctlops;
|
||||
unsigned ngroups, selector = 0;
|
||||
|
||||
mutex_lock(&pctldev->mutex);
|
||||
|
||||
ngroups = ops->get_groups_count(pctldev);
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
|
||||
seq_puts(s, "registered pin groups:\n");
|
||||
while (selector < ngroups) {
|
||||
|
|
@ -1251,7 +1270,7 @@ static int pinctrl_groups_show(struct seq_file *s, void *what)
|
|||
for (i = 0; i < num_pins; i++) {
|
||||
pname = pin_get_name(pctldev, pins[i]);
|
||||
if (WARN_ON(!pname)) {
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
return -EINVAL;
|
||||
}
|
||||
seq_printf(s, "pin %d (%s)\n", pins[i], pname);
|
||||
|
|
@ -1261,7 +1280,7 @@ static int pinctrl_groups_show(struct seq_file *s, void *what)
|
|||
selector++;
|
||||
}
|
||||
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1273,7 +1292,7 @@ static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
|
|||
|
||||
seq_puts(s, "GPIO ranges handled:\n");
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
mutex_lock(&pctldev->mutex);
|
||||
|
||||
/* Loop over the ranges */
|
||||
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
|
||||
|
|
@ -1284,7 +1303,7 @@ static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
|
|||
(range->pin_base + range->npins - 1));
|
||||
}
|
||||
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1295,7 +1314,7 @@ static int pinctrl_devices_show(struct seq_file *s, void *what)
|
|||
|
||||
seq_puts(s, "name [pinmux] [pinconf]\n");
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
mutex_lock(&pinctrldev_list_mutex);
|
||||
|
||||
list_for_each_entry(pctldev, &pinctrldev_list, node) {
|
||||
seq_printf(s, "%s ", pctldev->desc->name);
|
||||
|
|
@ -1310,7 +1329,7 @@ static int pinctrl_devices_show(struct seq_file *s, void *what)
|
|||
seq_puts(s, "\n");
|
||||
}
|
||||
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pinctrldev_list_mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1339,8 +1358,7 @@ static int pinctrl_maps_show(struct seq_file *s, void *what)
|
|||
|
||||
seq_puts(s, "Pinctrl maps:\n");
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
|
||||
mutex_lock(&pinctrl_maps_mutex);
|
||||
for_each_maps(maps_node, i, map) {
|
||||
seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n",
|
||||
map->dev_name, map->name, map_type(map->type),
|
||||
|
|
@ -1364,8 +1382,7 @@ static int pinctrl_maps_show(struct seq_file *s, void *what)
|
|||
|
||||
seq_printf(s, "\n");
|
||||
}
|
||||
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pinctrl_maps_mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1378,7 +1395,7 @@ static int pinctrl_show(struct seq_file *s, void *what)
|
|||
|
||||
seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
mutex_lock(&pinctrl_list_mutex);
|
||||
|
||||
list_for_each_entry(p, &pinctrl_list, node) {
|
||||
seq_printf(s, "device: %s current state: %s\n",
|
||||
|
|
@ -1410,7 +1427,7 @@ static int pinctrl_show(struct seq_file *s, void *what)
|
|||
}
|
||||
}
|
||||
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pinctrl_list_mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1596,6 +1613,7 @@ struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
|
|||
INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
|
||||
INIT_LIST_HEAD(&pctldev->gpio_ranges);
|
||||
pctldev->dev = dev;
|
||||
mutex_init(&pctldev->mutex);
|
||||
|
||||
/* check core ops for sanity */
|
||||
if (pinctrl_check_ops(pctldev)) {
|
||||
|
|
@ -1625,38 +1643,37 @@ struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
|
|||
goto out_err;
|
||||
}
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
|
||||
mutex_lock(&pinctrldev_list_mutex);
|
||||
list_add_tail(&pctldev->node, &pinctrldev_list);
|
||||
mutex_unlock(&pinctrldev_list_mutex);
|
||||
|
||||
pctldev->p = pinctrl_get(pctldev->dev);
|
||||
|
||||
pctldev->p = pinctrl_get_locked(pctldev->dev);
|
||||
if (!IS_ERR(pctldev->p)) {
|
||||
pctldev->hog_default =
|
||||
pinctrl_lookup_state_locked(pctldev->p,
|
||||
PINCTRL_STATE_DEFAULT);
|
||||
pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT);
|
||||
if (IS_ERR(pctldev->hog_default)) {
|
||||
dev_dbg(dev, "failed to lookup the default state\n");
|
||||
} else {
|
||||
if (pinctrl_select_state_locked(pctldev->p,
|
||||
if (pinctrl_select_state(pctldev->p,
|
||||
pctldev->hog_default))
|
||||
dev_err(dev,
|
||||
"failed to select default state\n");
|
||||
}
|
||||
|
||||
pctldev->hog_sleep =
|
||||
pinctrl_lookup_state_locked(pctldev->p,
|
||||
pinctrl_lookup_state(pctldev->p,
|
||||
PINCTRL_STATE_SLEEP);
|
||||
if (IS_ERR(pctldev->hog_sleep))
|
||||
dev_dbg(dev, "failed to lookup the sleep state\n");
|
||||
}
|
||||
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
|
||||
pinctrl_init_device_debugfs(pctldev);
|
||||
|
||||
return pctldev;
|
||||
|
||||
out_err:
|
||||
mutex_destroy(&pctldev->mutex);
|
||||
kfree(pctldev);
|
||||
return NULL;
|
||||
}
|
||||
|
|
@ -1674,12 +1691,13 @@ void pinctrl_unregister(struct pinctrl_dev *pctldev)
|
|||
if (pctldev == NULL)
|
||||
return;
|
||||
|
||||
mutex_lock(&pinctrldev_list_mutex);
|
||||
mutex_lock(&pctldev->mutex);
|
||||
|
||||
pinctrl_remove_device_debugfs(pctldev);
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
|
||||
if (!IS_ERR(pctldev->p))
|
||||
pinctrl_put_locked(pctldev->p, true);
|
||||
pinctrl_put(pctldev->p);
|
||||
|
||||
/* TODO: check that no pinmuxes are still active? */
|
||||
list_del(&pctldev->node);
|
||||
|
|
@ -1690,9 +1708,10 @@ void pinctrl_unregister(struct pinctrl_dev *pctldev)
|
|||
list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
|
||||
list_del(&range->node);
|
||||
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
mutex_destroy(&pctldev->mutex);
|
||||
kfree(pctldev);
|
||||
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pinctrldev_list_mutex);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pinctrl_unregister);
|
||||
|
||||
|
|
|
|||
|
|
@ -33,6 +33,7 @@ struct pinctrl_gpio_range;
|
|||
* @p: result of pinctrl_get() for this device
|
||||
* @hog_default: default state for pins hogged by this device
|
||||
* @hog_sleep: sleep state for pins hogged by this device
|
||||
* @mutex: mutex taken on each pin controller specific action
|
||||
* @device_root: debugfs root for this device
|
||||
*/
|
||||
struct pinctrl_dev {
|
||||
|
|
@ -46,6 +47,7 @@ struct pinctrl_dev {
|
|||
struct pinctrl *p;
|
||||
struct pinctrl_state *hog_default;
|
||||
struct pinctrl_state *hog_sleep;
|
||||
struct mutex mutex;
|
||||
#ifdef CONFIG_DEBUG_FS
|
||||
struct dentry *device_root;
|
||||
#endif
|
||||
|
|
@ -168,6 +170,7 @@ struct pinctrl_maps {
|
|||
};
|
||||
|
||||
struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);
|
||||
struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np);
|
||||
int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
|
||||
const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin);
|
||||
int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
|
||||
|
|
@ -186,8 +189,7 @@ void pinctrl_unregister_map(struct pinctrl_map const *map);
|
|||
extern int pinctrl_force_sleep(struct pinctrl_dev *pctldev);
|
||||
extern int pinctrl_force_default(struct pinctrl_dev *pctldev);
|
||||
|
||||
extern struct mutex pinctrl_mutex;
|
||||
extern struct list_head pinctrldev_list;
|
||||
extern struct mutex pinctrl_maps_mutex;
|
||||
extern struct list_head pinctrl_maps;
|
||||
|
||||
#define for_each_maps(_maps_node_, _i_, _map_) \
|
||||
|
|
|
|||
|
|
@ -95,22 +95,11 @@ static int dt_remember_or_free_map(struct pinctrl *p, const char *statename,
|
|||
return pinctrl_register_map(map, num_maps, false, true);
|
||||
}
|
||||
|
||||
static struct pinctrl_dev *find_pinctrl_by_of_node(struct device_node *np)
|
||||
{
|
||||
struct pinctrl_dev *pctldev;
|
||||
|
||||
list_for_each_entry(pctldev, &pinctrldev_list, node)
|
||||
if (pctldev->dev->of_node == np)
|
||||
return pctldev;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
struct pinctrl_dev *of_pinctrl_get(struct device_node *np)
|
||||
{
|
||||
struct pinctrl_dev *pctldev;
|
||||
|
||||
pctldev = find_pinctrl_by_of_node(np);
|
||||
pctldev = get_pinctrl_dev_from_of_node(np);
|
||||
if (!pctldev)
|
||||
return NULL;
|
||||
|
||||
|
|
@ -138,7 +127,7 @@ static int dt_to_map_one_config(struct pinctrl *p, const char *statename,
|
|||
/* OK let's just assume this will appear later then */
|
||||
return -EPROBE_DEFER;
|
||||
}
|
||||
pctldev = find_pinctrl_by_of_node(np_pctldev);
|
||||
pctldev = get_pinctrl_dev_from_of_node(np_pctldev);
|
||||
if (pctldev)
|
||||
break;
|
||||
/* Do not defer probing of hogs (circular loop) */
|
||||
|
|
|
|||
|
|
@ -89,14 +89,14 @@ int pin_config_get(const char *dev_name, const char *name,
|
|||
struct pinctrl_dev *pctldev;
|
||||
int pin;
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
|
||||
pctldev = get_pinctrl_dev_from_devname(dev_name);
|
||||
if (!pctldev) {
|
||||
pin = -EINVAL;
|
||||
goto unlock;
|
||||
return pin;
|
||||
}
|
||||
|
||||
mutex_lock(&pctldev->mutex);
|
||||
|
||||
pin = pin_get_from_name(pctldev, name);
|
||||
if (pin < 0)
|
||||
goto unlock;
|
||||
|
|
@ -104,7 +104,7 @@ int pin_config_get(const char *dev_name, const char *name,
|
|||
pin = pin_config_get_for_pin(pctldev, pin, config);
|
||||
|
||||
unlock:
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
return pin;
|
||||
}
|
||||
EXPORT_SYMBOL(pin_config_get);
|
||||
|
|
@ -145,14 +145,14 @@ int pin_config_set(const char *dev_name, const char *name,
|
|||
struct pinctrl_dev *pctldev;
|
||||
int pin, ret;
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
|
||||
pctldev = get_pinctrl_dev_from_devname(dev_name);
|
||||
if (!pctldev) {
|
||||
ret = -EINVAL;
|
||||
goto unlock;
|
||||
return ret;
|
||||
}
|
||||
|
||||
mutex_lock(&pctldev->mutex);
|
||||
|
||||
pin = pin_get_from_name(pctldev, name);
|
||||
if (pin < 0) {
|
||||
ret = pin;
|
||||
|
|
@ -162,7 +162,7 @@ int pin_config_set(const char *dev_name, const char *name,
|
|||
ret = pin_config_set_for_pin(pctldev, pin, config);
|
||||
|
||||
unlock:
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(pin_config_set);
|
||||
|
|
@ -174,13 +174,14 @@ int pin_config_group_get(const char *dev_name, const char *pin_group,
|
|||
const struct pinconf_ops *ops;
|
||||
int selector, ret;
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
|
||||
pctldev = get_pinctrl_dev_from_devname(dev_name);
|
||||
if (!pctldev) {
|
||||
ret = -EINVAL;
|
||||
goto unlock;
|
||||
return ret;
|
||||
}
|
||||
|
||||
mutex_lock(&pctldev->mutex);
|
||||
|
||||
ops = pctldev->desc->confops;
|
||||
|
||||
if (!ops || !ops->pin_config_group_get) {
|
||||
|
|
@ -200,7 +201,7 @@ int pin_config_group_get(const char *dev_name, const char *pin_group,
|
|||
ret = ops->pin_config_group_get(pctldev, selector, config);
|
||||
|
||||
unlock:
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(pin_config_group_get);
|
||||
|
|
@ -217,13 +218,14 @@ int pin_config_group_set(const char *dev_name, const char *pin_group,
|
|||
int ret;
|
||||
int i;
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
|
||||
pctldev = get_pinctrl_dev_from_devname(dev_name);
|
||||
if (!pctldev) {
|
||||
ret = -EINVAL;
|
||||
goto unlock;
|
||||
return ret;
|
||||
}
|
||||
|
||||
mutex_lock(&pctldev->mutex);
|
||||
|
||||
ops = pctldev->desc->confops;
|
||||
pctlops = pctldev->desc->pctlops;
|
||||
|
||||
|
|
@ -279,7 +281,7 @@ int pin_config_group_set(const char *dev_name, const char *pin_group,
|
|||
ret = 0;
|
||||
|
||||
unlock:
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -487,7 +489,7 @@ static int pinconf_pins_show(struct seq_file *s, void *what)
|
|||
seq_puts(s, "Pin config settings per pin\n");
|
||||
seq_puts(s, "Format: pin (name): configs\n");
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
mutex_lock(&pctldev->mutex);
|
||||
|
||||
/* The pin number can be retrived from the pin controller descriptor */
|
||||
for (i = 0; i < pctldev->desc->npins; i++) {
|
||||
|
|
@ -507,7 +509,7 @@ static int pinconf_pins_show(struct seq_file *s, void *what)
|
|||
seq_printf(s, "\n");
|
||||
}
|
||||
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -608,7 +610,7 @@ static int pinconf_dbg_config_print(struct seq_file *s, void *d)
|
|||
bool found = false;
|
||||
unsigned long config;
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
mutex_lock(&pctldev->mutex);
|
||||
|
||||
/* Parse the pinctrl map and look for the elected pin/state */
|
||||
for_each_maps(maps_node, i, map) {
|
||||
|
|
@ -657,7 +659,7 @@ static int pinconf_dbg_config_print(struct seq_file *s, void *d)
|
|||
confops->pin_config_config_dbg_show(pctldev, s, config);
|
||||
|
||||
exit:
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -747,7 +749,7 @@ static int pinconf_dbg_config_write(struct file *file,
|
|||
return -EINVAL;
|
||||
strncpy(config, token, MAX_NAME_LEN);
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
mutex_lock(&pinctrl_maps_mutex);
|
||||
|
||||
/* Parse the pinctrl map and look for the selected dev/state/pin */
|
||||
for_each_maps(maps_node, i, map) {
|
||||
|
|
@ -785,7 +787,7 @@ static int pinconf_dbg_config_write(struct file *file,
|
|||
}
|
||||
|
||||
exit:
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pinctrl_maps_mutex);
|
||||
|
||||
return count;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -506,7 +506,7 @@ static int pinmux_functions_show(struct seq_file *s, void *what)
|
|||
if (!pmxops)
|
||||
return 0;
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
mutex_lock(&pctldev->mutex);
|
||||
nfuncs = pmxops->get_functions_count(pctldev);
|
||||
while (func_selector < nfuncs) {
|
||||
const char *func = pmxops->get_function_name(pctldev,
|
||||
|
|
@ -530,7 +530,7 @@ static int pinmux_functions_show(struct seq_file *s, void *what)
|
|||
func_selector++;
|
||||
}
|
||||
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -548,7 +548,7 @@ static int pinmux_pins_show(struct seq_file *s, void *what)
|
|||
seq_puts(s, "Pinmux settings per pin\n");
|
||||
seq_puts(s, "Format: pin (name): mux_owner gpio_owner hog?\n");
|
||||
|
||||
mutex_lock(&pinctrl_mutex);
|
||||
mutex_lock(&pctldev->mutex);
|
||||
|
||||
/* The pin number can be retrived from the pin controller descriptor */
|
||||
for (i = 0; i < pctldev->desc->npins; i++) {
|
||||
|
|
@ -583,7 +583,7 @@ static int pinmux_pins_show(struct seq_file *s, void *what)
|
|||
seq_printf(s, "\n");
|
||||
}
|
||||
|
||||
mutex_unlock(&pinctrl_mutex);
|
||||
mutex_unlock(&pctldev->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
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Ссылка в новой задаче