Semaphore should be released in get_super

[sdrb <sdrb@xxxxxxx>]

Hello,

Probably I found a bug in get_super() proc. I think there should be 
semaphore released before return sb.
I attached diff file.

regards,
sdrb

diff --git a/fs/super.c b/fs/super.c
index c04f7e0..361bbec 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -473,8 +473,10 @@ rescan:
 			spin_unlock(&sb_lock);
 			down_read(&sb->s_umount);
 			/* still alive? */
-			if (sb->s_root)
+			if (sb->s_root) {
+				up_read(&sb->s_umount);
 				return sb;
+			}
 			up_read(&sb->s_umount);
 			/* nope, got unmounted */
 			spin_lock(&sb_lock);