[PATCH 03/15] genhd: Return error from blk_register_region

Fam Zheng
2016-08-17T07:15:03Z

blk_register_region can fail (-ENOMEM), return the error to the caller.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
block/genhd.c | 4 ++--
include/linux/genhd.h | 10 +++++-----
2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 3dcecaa..8c7510d 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -474,11 +474,11 @@ static char *bdevt_str(dev_t devt, char *buf)
* range must be nonzero
* The hash chain is sorted on range, so that subranges can override.
*/
-void blk_register_region(dev_t devt, unsigned long range, struct module *module,
+int blk_register_region(dev_t devt, unsigned long range, struct module *module,
struct kobject *(*probe)(dev_t, int *, void *),
int (*lock)(dev_t, void *), void *data)
{
- kobj_map(bdev_map, devt, range, module, probe, lock, data);
+ return kobj_map(bdev_map, devt, range, module, probe, lock, data);
}

EXPORT_SYMBOL(blk_register_region);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 889b1bb..b6fd666 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -617,11 +617,11 @@ extern struct gendisk *alloc_disk_node(int minors, int node_id);
extern struct gendisk *alloc_disk(int minors);
extern struct kobject *get_disk(struct gendisk *disk);
extern void put_disk(struct gendisk *disk);
-extern void blk_register_region(dev_t devt, unsigned long range,
- struct module *module,
- struct kobject *(*probe)(dev_t, int *, void *),
- int (*lock)(dev_t, void *),
- void *data);
+extern int blk_register_region(dev_t devt, unsigned long range,
+ struct module *module,
+ struct kobject *(*probe)(dev_t, int *, void *),
+ int (*lock)(dev_t, void *),
+ void *data);
extern void blk_unregister_region(dev_t devt, unsigned long range);

extern ssize_t part_size_show(struct device *dev,
--
2.7.4