From: Tejun Heo <tj@kernel.org>
Date: Wed, 19 Oct 2011 12:32:38 +0000 (+0200)
Subject: block: reorganize queue draining
X-Git-Tag: v3.2-rc1~49^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e3c78ca524d230bc145e902625e88c392a58ddf3;p=pandora-kernel.git

block: reorganize queue draining

Reorganize queue draining related code in preparation of queue exit
changes.

* Factor out actual draining from elv_quiesce_start() to
  blk_drain_queue().

* Make elv_quiesce_start/end() responsible for their own locking.

* Replace open-coded ELVSWITCH clearing in elevator_switch() with
  elv_quiesce_end().

This patch doesn't cause any visible functional difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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