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Commit b23530eb authored by Ming Lei's avatar Ming Lei Committed by Greg Kroah-Hartman
Browse files

driver core: remove polling for driver_probe_done(v5) 



This patch removes 100ms polling for driver_probe_done in
wait_for_device_probe(), and uses wait_event() instead.
Removing polling in fs initialization may lead to
a faster boot.

This patch also changes the return type of wait_for_device_done()
from int to void.

This patch is against Arjan's patch in linux-next tree.

Signed-off-by: default avatarMing Lei <tom.leiming@gmail.com>
Acked-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: default avatarArjan van de Ven <arjan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 04256b4a

drivers/base/dd.c

+2 −6
Original line number Diff line number Diff line
@@ -172,16 +172,12 @@ int driver_probe_done(void) 
/**

 * wait_for_device_probe

 * Wait for device probing to be completed.

 *

 * Note: this function polls at 100 msec intervals.

 */

int wait_for_device_probe(void)

void wait_for_device_probe(void)

{

	/* wait for the known devices to complete their probing */

	while (driver_probe_done() != 0)

		msleep(100);

	wait_event(probe_waitqueue, atomic_read(&probe_count) == 0);

	async_synchronize_full();

	return 0;

}



/**

include/linux/device.h

+1 −1
Original line number Diff line number Diff line
@@ -147,7 +147,7 @@ extern void put_driver(struct device_driver *drv); 
extern struct device_driver *driver_find(const char *name,

					 struct bus_type *bus);

extern int driver_probe_done(void);

extern int wait_for_device_probe(void);

extern void wait_for_device_probe(void);





/* sysfs interface for exporting driver attributes */