Driver core: Add BUS_NOTIFY_BIND_DRIVER (45daef0f) · Commits · 戴 / test

Add BUS_NOTIFY_BIND_DRIVER as a bus notifier event. For driver binding/unbinding we with this in place have the following bus notifier events: - BUS_NOTIFY_BIND_DRIVER - before ->probe() - BUS_NOTIFY_BOUND_DRIVER - after ->probe() - BUS_NOTIFY_UNBIND_DRIVER - before ->remove() - BUS_NOTIFY_UNBOUND_DRIVER - after ->remove() The event BUS_NOTIFY_BIND_DRIVER allows bus code to be notified that ->probe() is about to be called. Useful for bus code that needs to setup hardware before the driver gets to run. With this in place platform drivers can be loaded and unloaded as modules and the new BIND event allows bus code to control for instance device clocks that must be enabled before the driver can be executed. Without this patch there is no way for the bus code to get notified that a modular driver is about to be probed. Signed-off-by:

Magnus Damm <damm@opensource.se> Signed-off-by:

Greg Kroah-Hartman <gregkh@suse.de>

drivers/base/dd.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -51,6 +51,10 @@ static int driver_sysfs_add(struct device *dev)
		{
		int ret;

		if (dev->bus)
		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
		BUS_NOTIFY_BIND_DRIVER, dev);

		ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj,
		kobject_name(&dev->kobj));
		if (ret == 0) {

include/linux/device.h

+5 −3

Original line number	Diff line number	Diff line
		@@ -109,10 +109,12 @@ extern int bus_unregister_notifier(struct bus_type *bus,
		*/
		#define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
		#define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
		#define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
		#define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
		#define BUS_NOTIFY_BIND_DRIVER 0x00000003 /* driver about to be
		bound */
		#define BUS_NOTIFY_BOUND_DRIVER 0x00000004 /* driver bound to device */
		#define BUS_NOTIFY_UNBIND_DRIVER 0x00000005 /* driver about to be
		unbound */
		#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000005 /* driver is unbound
		#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000006 /* driver is unbound
		from the device */

		extern struct kset bus_get_kset(struct bus_type bus);

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