[PATCH 3/3] writeback: mm/backing-dev.c:bdi_start_fn() should use bh disabling locks

[Jens Axboe]

bdi_lock is grabbed from softirq context, so we need to always use
bh disabling spinlocks. All the other callsites are OK, but this one
missed the _bh() postfix.

Signed-off-by: Jens Axboe <jens.axboe@xxxxxxxxxx>
---
 mm/backing-dev.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index d45251f..60578bc 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -365,9 +365,9 @@ static int bdi_start_fn(void *ptr)
 	/*
 	 * Make us discoverable on the bdi_list again
 	 */
-	spin_lock(&bdi_lock);
+	spin_lock_bh(&bdi_lock);
 	list_add_tail_rcu(&bdi->bdi_list, &bdi_list);
-	spin_unlock(&bdi_lock);
+	spin_unlock_bh(&bdi_lock);
 
 	ret = bdi_writeback_task(wb);
 
-- 
1.6.3.9.g6345


--cWoXeonUoKmBZSoM--
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