dm: remove superfluous irq disablement in dm_request_fn

This patch changes spin_lock_irq() to spin_lock() in dm_request_fn().
This patch is just a clean-up and no functional change.

The spin_lock_irq() was leftover from the early request-based dm code,
where map_request() used to enable interrupts.
Since current map_request() never enables interrupts, we can change it
to spin_lock() to match the prior spin_unlock().

Auditing through the dm and block-layer code called from
map_request(), I confirmed all functions save/restore interrupt
status, so no function returning with interrupts enabled.
Also I haven't observed any problem on my test environment which
uses scsi and lpfc driver after heavy I/O testing with occasional
path down/up.

Added BUG_ON() to detect breakage in future.

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: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index e504bb4..eaa3af0 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1637,13 +1637,15 @@ static void dm_request_fn(struct request_queue *q)
                if (map_request(ti, clone, md))
                        goto requeued;
 
-               spin_lock_irq(q->queue_lock);
+               BUG_ON(!irqs_disabled());
+               spin_lock(q->queue_lock);
        }
 
        goto out;
 
 requeued:
-       spin_lock_irq(q->queue_lock);
+       BUG_ON(!irqs_disabled());
+       spin_lock(q->queue_lock);
 
 plug_and_out:
        if (!elv_queue_empty(q))