tree b889df9e26458c134a909c9ada51fa961fbf1291
parent 5d67aa2366ccb8257d103d0b43df855605c3c086
author Kiyoshi Ueda <k-ueda@ct.jp.nec.com> 1245661957 +0100
committer Alasdair G Kergon <agk@redhat.com> 1245661957 +0100

dm: disable interrupt when taking map_lock

This patch disables interrupt when taking map_lock to avoid
lockdep warnings in request-based dm.

request-based dm takes map_lock after taking queue_lock with
disabling interrupt:
  spin_lock_irqsave(queue_lock)
  q->request_fn() == dm_request_fn()
    => dm_get_table()
         => read_lock(map_lock)
while queue_lock could be (but isn't) taken in interrupt context.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Acked-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Acked-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>