Commit 346e485d authored by Julian Wiedmann's avatar Julian Wiedmann Committed by Martin Schwidefsky
Browse files

s390/ccwgroup: add get_ccwgroupdev_by_busid() 



Provide function to find a ccwgroup device by its busid.

Acked-by: default avatarSebastian Ott <sebott@linux.ibm.com>
Signed-off-by: default avatarJulian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 00fab235

arch/s390/include/asm/ccwgroup.h

+2 −0
Original line number Diff line number Diff line
@@ -64,6 +64,8 @@ extern int ccwgroup_driver_register (struct ccwgroup_driver *cdriver); 
extern void ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver);

int ccwgroup_create_dev(struct device *root, struct ccwgroup_driver *gdrv,

			int num_devices, const char *buf);

struct ccwgroup_device *get_ccwgroupdev_by_busid(struct ccwgroup_driver *gdrv,

						 char *bus_id);



extern int ccwgroup_set_online(struct ccwgroup_device *gdev);

extern int ccwgroup_set_offline(struct ccwgroup_device *gdev);

drivers/s390/cio/ccwgroup.c

+30 −0
Original line number Diff line number Diff line
@@ -608,6 +608,36 @@ void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver) 
}

EXPORT_SYMBOL(ccwgroup_driver_unregister);



static int __ccwgroupdev_check_busid(struct device *dev, void *id)

{

	char *bus_id = id;



	return (strcmp(bus_id, dev_name(dev)) == 0);

}



/**

 * get_ccwgroupdev_by_busid() - obtain device from a bus id

 * @gdrv: driver the device is owned by

 * @bus_id: bus id of the device to be searched

 *

 * This function searches all devices owned by @gdrv for a device with a bus

 * id matching @bus_id.

 * Returns:

 *  If a match is found, its reference count of the found device is increased

 *  and it is returned; else %NULL is returned.

 */

struct ccwgroup_device *get_ccwgroupdev_by_busid(struct ccwgroup_driver *gdrv,

						 char *bus_id)

{

	struct device *dev;



	dev = driver_find_device(&gdrv->driver, NULL, bus_id,

				 __ccwgroupdev_check_busid);



	return dev ? to_ccwgroupdev(dev) : NULL;

}

EXPORT_SYMBOL_GPL(get_ccwgroupdev_by_busid);



/**

 * ccwgroup_probe_ccwdev() - probe function for slave devices

 * @cdev: ccw device to be probed