diff options
| -rw-r--r-- | arch/s390/include/asm/ccwgroup.h | 2 | ||||
| -rw-r--r-- | drivers/s390/cio/ccwgroup.c | 30 |
2 files changed, 32 insertions, 0 deletions
diff --git a/arch/s390/include/asm/ccwgroup.h b/arch/s390/include/asm/ccwgroup.h index 860cab7479c3..7293c139dd79 100644 --- a/arch/s390/include/asm/ccwgroup.h +++ b/arch/s390/include/asm/ccwgroup.h @@ -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); diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c index 93b2862bd3fa..4ebf6d4fc66c 100644 --- a/drivers/s390/cio/ccwgroup.c +++ b/drivers/s390/cio/ccwgroup.c @@ -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 |