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s390/ccwgroup: add get_ccwgroupdev_by_busid()

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Provide function to find a ccwgroup device by its busid.

Acked-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Julian Wiedmann 2018-09-14 13:47:41 +02:00 committed by Martin Schwidefsky
parent 00fab2350e
commit 346e485d42
2 changed files with 32 additions and 0 deletions
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2
arch/s390/include/asm/ccwgroup.h
View File

@ -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);

30
drivers/s390/cio/ccwgroup.c
View File

@ -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