Driver core: Remove unneeded routines from driver core
This patch (as783) simplifies the driver core slightly by removing four unnecessary _get and _put methods. It is vital that when a driver is removed from its bus's klist of registered drivers, or when a device is removed from a driver's klist of bound devices, that the klist updates complete synchronously. Otherwise the kernel might try binding an unregistered driver to a newly-registered device, or adding a device to the klist for a new driver before it has been removed from the old driver's klist. Since the removals must be synchronous, they don't need to update any reference counts. Hence the _get and _put methods can be dispensed with. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -696,22 +696,6 @@ static void klist_devices_put(struct klist_node *n)
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put_device(dev);
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}
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static void klist_drivers_get(struct klist_node *n)
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{
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struct device_driver *drv = container_of(n, struct device_driver,
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knode_bus);
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get_driver(drv);
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}
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static void klist_drivers_put(struct klist_node *n)
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{
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struct device_driver *drv = container_of(n, struct device_driver,
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knode_bus);
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put_driver(drv);
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}
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/**
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* bus_register - register a bus with the system.
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* @bus: bus.
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@ -747,7 +731,7 @@ int bus_register(struct bus_type * bus)
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goto bus_drivers_fail;
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klist_init(&bus->klist_devices, klist_devices_get, klist_devices_put);
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klist_init(&bus->klist_drivers, klist_drivers_get, klist_drivers_put);
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klist_init(&bus->klist_drivers, NULL, NULL);
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bus_add_attrs(bus);
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pr_debug("bus type '%s' registered\n", bus->name);
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@ -142,20 +142,6 @@ void put_driver(struct device_driver * drv)
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kobject_put(&drv->kobj);
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}
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static void klist_devices_get(struct klist_node *n)
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{
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struct device *dev = container_of(n, struct device, knode_driver);
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get_device(dev);
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}
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static void klist_devices_put(struct klist_node *n)
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{
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struct device *dev = container_of(n, struct device, knode_driver);
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put_device(dev);
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}
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/**
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* driver_register - register driver with bus
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* @drv: driver to register
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@ -175,7 +161,7 @@ int driver_register(struct device_driver * drv)
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(drv->bus->shutdown && drv->shutdown)) {
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printk(KERN_WARNING "Driver '%s' needs updating - please use bus_type methods\n", drv->name);
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}
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klist_init(&drv->klist_devices, klist_devices_get, klist_devices_put);
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klist_init(&drv->klist_devices, NULL, NULL);
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init_completion(&drv->unloaded);
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return bus_add_driver(drv);
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}
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