[PATCH] writeback: Fix lock imbalance in writeback_sb_inodes()

[Jan Kara]

Fix bug introduced by 169ebd90.  We have to have wb_list_lock locked when
restarting writeback loop after having waited for inode writeback.

Signed-off-by: Jan Kara <jack@xxxxxxx>
---
 fs/fs-writeback.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 8d2fb8c..41a3ccf 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -664,6 +664,7 @@ static long writeback_sb_inodes(struct super_block *sb,
 			/* Wait for I_SYNC. This function drops i_lock... */
 			inode_sleep_on_writeback(inode);
 			/* Inode may be gone, start again */
+			spin_lock(&wb->list_lock);
 			continue;
 		}
 		inode->i_state |= I_SYNC;
-- 
1.7.1


--XMCwj5IQnwKtuyBG--
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