dm: fix locking context in queue_io()

Now queue_io() is called from dec_pending(), which may be called with
interrupts disabled, so queue_io() must not enable interrupts
unconditionally and must save/restore the current interrupts status.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 2011704b8ba0..cd2f7e77b625 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -512,9 +512,11 @@ static void end_io_acct(struct dm_io *io)
  */
 static void queue_io(struct mapped_device *md, struct bio *bio)
 {
-        spin_lock_irq(&md->deferred_lock);
+        unsigned long flags;
+
+        spin_lock_irqsave(&md->deferred_lock, flags);
         bio_list_add(&md->deferred, bio);
-        spin_unlock_irq(&md->deferred_lock);
+        spin_unlock_irqrestore(&md->deferred_lock, flags);
         queue_work(md->wq, &md->work);
 }