tree d1e42b31f9a66582096e9548fc90cc069d6f39e2
parent 9c56187d3c345cc0e7a2f162b8c32543175d7bf7
author Tejun Heo  <htejun@gmail.com> 1118919451 +0200
committer Jens Axboe <axboe@suse.de> 1118919451 +0200

 This patch fixes q->unplug_thresh condition check in
__elv_add_request().  rq.count[READ] + rq.count[WRITE] can increase
more than one if another thread has allocated a request after the
current request is allocated or in_flight could have changed resulting
in larger-than-one change of nrq, thus breaking the threshold
mechanism.

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Tejun Heo <htejun@gmail.com>