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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>
hifive-unleashed-5.1
Kiyoshi Ueda 2010-09-08 18:07:01 +02:00 committed by Jens Axboe
parent 6a8736d10c
commit 05447420f9
1 changed files with 4 additions and 2 deletions
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6
drivers/md/dm.c
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@ -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);
}