[PATCH 4.20 106/145] f2fs: fix missing unlock(sbi->gc_mutex)

[Greg Kroah-Hartman]

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>

commit 8f31b4665c14fe19593601a250275e58c7ad0ef1 upstream.

This fixes missing unlock call.

Cc: <stable@xxxxxxxxxxxxxxx>
Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/f2fs/super.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1457,19 +1457,16 @@ static int f2fs_disable_checkpoint(struc
 
 	sbi->sb->s_flags |= SB_ACTIVE;
 
-	mutex_lock(&sbi->gc_mutex);
 	f2fs_update_time(sbi, DISABLE_TIME);
 
 	while (!f2fs_time_over(sbi, DISABLE_TIME)) {
+		mutex_lock(&sbi->gc_mutex);
 		err = f2fs_gc(sbi, true, false, NULL_SEGNO);
 		if (err == -ENODATA)
 			break;
-		if (err && err != -EAGAIN) {
-			mutex_unlock(&sbi->gc_mutex);
+		if (err && err != -EAGAIN)
 			return err;
-		}
 	}
-	mutex_unlock(&sbi->gc_mutex);
 
 	err = sync_filesystem(sbi->sb);
 	if (err)