writeback: fix bdi_writeback iteration in wakeup_dirtytime_writeback()

wakeup_dirtytime_writeback() walks and wakes up all wb's of all bdi's;
unfortunately, it was always waking up bdi->wb instead of the wb being
walked.  Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: 001fe6f617b1 ("writeback: make wakeup_dirtytime_writeback() handle multiple bdi_writeback's")
Reviewed-by: Jan Kara <jack@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 091a36444972..d0da30668e98 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1897,8 +1897,8 @@ static void wakeup_dirtytime_writeback(struct work_struct *w)
                 struct wb_iter iter;
 
                 bdi_for_each_wb(wb, bdi, &iter, 0)
-                        if (!list_empty(&bdi->wb.b_dirty_time))
-                                wb_wakeup(&bdi->wb);
+                        if (!list_empty(&wb->b_dirty_time))
+                                wb_wakeup(wb);
         }
         rcu_read_unlock();
         schedule_delayed_work(&dirtytime_work, dirtytime_expire_interval * HZ);