diff --git a/[refs] b/[refs]
index 99c9d4ae5cb2..73c945743e9a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f5c8f7dae75e1e6bb3200fc61302e4d5e2df3dc2
+refs/heads/master: 4d04e4fbf8fc9f5136a64d45e2c20de095c08efb
diff --git a/trunk/fs/ext4/super.c b/trunk/fs/ext4/super.c
index cb96f127c366..02bf24343979 100644
--- a/trunk/fs/ext4/super.c
+++ b/trunk/fs/ext4/super.c
@@ -3337,8 +3337,10 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
 		blk++;
 	}
 out:
-	if (len == towrite)
+	if (len == towrite) {
+		mutex_unlock(&inode->i_mutex);
 		return err;
+	}
 	if (inode->i_size < off+len-towrite) {
 		i_size_write(inode, off+len-towrite);
 		EXT4_I(inode)->i_disksize = inode->i_size;