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Input: max8925_onkey - avoid accessing input device too early 

Input device must be allocated (but not necessarily registered) before
requesting IRQs, otherwise there is a chance that IRQ handler fires and
tries to reference not yet allocated input device.

Also it makes sense to store relative IRQ numbers in max8925_onkey_info
structure as they are needed in suspend/resume which we expect to be
called more often than probe and remove.

Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2012-03-06 09:10:21 -08:00
Родитель adab30d738
Коммит 104a5f3cad
1 изменённых файлов: 43 добавлений и 46 удалений
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89
drivers/input/misc/max8925_onkey.c
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@ -1,5 +1,5 @@
/**
* max8925_onkey.c - MAX8925 ONKEY driver
* MAX8925 ONKEY driver
*
* Copyright (C) 2009 Marvell International Ltd.
* Haojian Zhuang <haojian.zhuang@marvell.com>
@ -35,7 +35,7 @@ struct max8925_onkey_info {
struct input_dev *idev;
struct i2c_client *i2c;
struct device *dev;
int irq[2];
unsigned int irq[2];
};
/*
@ -46,17 +46,14 @@ struct max8925_onkey_info {
static irqreturn_t max8925_onkey_handler(int irq, void *data)
{
struct max8925_onkey_info *info = data;
int ret, event;
int state;
ret = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS);
if (ret & SW_INPUT)
event = 1;
else
event = 0;
input_report_key(info->idev, KEY_POWER, event);
state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS);
input_report_key(info->idev, KEY_POWER, state & SW_INPUT);
input_sync(info->idev);
dev_dbg(info->dev, "onkey event:%d\n", event);
dev_dbg(info->dev, "onkey state:%d\n", state);
/* Enable hardreset to halt if system isn't shutdown on time */
max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
@ -69,6 +66,7 @@ static int __devinit max8925_onkey_probe(struct platform_device *pdev)
{
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct max8925_onkey_info *info;
struct input_dev *input;
int irq[2], error;
irq[0] = platform_get_irq(pdev, 0);
@ -76,6 +74,7 @@ static int __devinit max8925_onkey_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "No IRQ resource!\n");
return -EINVAL;
}
irq[1] = platform_get_irq(pdev, 1);
if (irq[1] < 0) {
dev_err(&pdev->dev, "No IRQ resource!\n");
@ -83,11 +82,24 @@ static int __devinit max8925_onkey_probe(struct platform_device *pdev)
}
info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
input = input_allocate_device();
if (!info || !input) {
error = -ENOMEM;
goto err_free_mem;
}
info->idev = input;
info->i2c = chip->i2c;
info->dev = &pdev->dev;
info->irq[0] = irq[0];
info->irq[1] = irq[1];
input->name = "max8925_on";
input->phys = "max8925_on/input0";
input->id.bustype = BUS_I2C;
input->dev.parent = &pdev->dev;
input_set_capability(input, EV_KEY, KEY_POWER);
irq[0] += chip->irq_base;
irq[1] += chip->irq_base;
@ -96,61 +108,46 @@ static int __devinit max8925_onkey_probe(struct platform_device *pdev)
if (error < 0) {
dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
irq[0], error);
goto out;
goto err_free_mem;
}
error = request_threaded_irq(irq[1], NULL, max8925_onkey_handler,
IRQF_ONESHOT, "onkey-up", info);
if (error < 0) {
dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
irq[1], error);
goto out_irq;
goto err_free_irq0;
}
info->idev = input_allocate_device();
if (!info->idev) {
dev_err(chip->dev, "Failed to allocate input dev\n");
error = -ENOMEM;
goto out_input;
}
info->idev->name = "max8925_on";
info->idev->phys = "max8925_on/input0";
info->idev->id.bustype = BUS_I2C;
info->idev->dev.parent = &pdev->dev;
info->irq[0] = irq[0];
info->irq[1] = irq[1];
info->idev->evbit[0] = BIT_MASK(EV_KEY);
info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
device_init_wakeup(&pdev->dev, 1);
error = input_register_device(info->idev);
if (error) {
dev_err(chip->dev, "Can't register input device: %d\n", error);
goto out_reg;
goto err_free_irq1;
}
platform_set_drvdata(pdev, info);
device_init_wakeup(&pdev->dev, 1);
return 0;
out_reg:
input_free_device(info->idev);
out_input:
free_irq(info->irq[1], info);
out_irq:
free_irq(info->irq[0], info);
out:
err_free_irq1:
free_irq(irq[1], info);
err_free_irq0:
free_irq(irq[0], info);
err_free_mem:
input_free_device(input);
kfree(info);
return error;
}
static int __devexit max8925_onkey_remove(struct platform_device *pdev)
{
struct max8925_onkey_info *info = platform_get_drvdata(pdev);
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
free_irq(info->irq[0], info);
free_irq(info->irq[1], info);
free_irq(info->irq[0] + chip->irq_base, info);
free_irq(info->irq[1] + chip->irq_base, info);
input_unregister_device(info->idev);
kfree(info);
@ -167,8 +164,8 @@ static int max8925_onkey_suspend(struct device *dev)
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
if (device_may_wakeup(dev)) {
chip->wakeup_flag |= 1 << (info->irq[0] - chip->irq_base);
chip->wakeup_flag |= 1 << (info->irq[1] - chip->irq_base);
chip->wakeup_flag |= 1 << info->irq[0];
chip->wakeup_flag |= 1 << info->irq[1];
}
return 0;
@ -181,8 +178,8 @@ static int max8925_onkey_resume(struct device *dev)
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
if (device_may_wakeup(dev)) {
chip->wakeup_flag &= ~(1 << (info->irq[0] - chip->irq_base));
chip->wakeup_flag &= ~(1 << (info->irq[1] - chip->irq_base));
chip->wakeup_flag &= ~(1 << info->irq[0]);
chip->wakeup_flag &= ~(1 << info->irq[1]);
}
return 0;