[PATCH 1/4] void unregister_blkdev - do WARN_ON failure

[Akinobu Mita <akinobu.mita@gmail.com>]

When unregister_blkdev() has failed, something wrong happened.
This patch adds WARN_ON to notify such badness.

Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>

---
 block/genhd.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Index: 2.6-mm/block/genhd.c
===================================================================
--- 2.6-mm.orig/block/genhd.c
+++ 2.6-mm/block/genhd.c
@@ -120,9 +120,10 @@ int unregister_blkdev(unsigned int major
 	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;
 	}