unregister_blkdev(): do WARN_ON on failure
When unregister_blkdev() has failed, something wrong happened. This patch
adds WARN_ON to notify of such badness.
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/block/genhd.c b/block/genhd.c
index b321cad..7f71b2c 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -120,9 +120,10 @@
for (n = &major_names[index]; *n; n = &(*n)->next)
if ((*n)->major == major)
break;
- if (!*n || strcmp((*n)->name, name))
+ if (!*n || strcmp((*n)->name, name)) {
+ WARN_ON(1);
ret = -EINVAL;
- else {
+ } else {
p = *n;
*n = p->next;
}