From c374f127e4ff17a318b9ae95a5bf65f370c2d0b1 Mon Sep 17 00:00:00 2001
From: Tejun Heo <htejun@gmail.com>
Date: Thu, 16 Jun 2005 12:57:31 +0200
Subject: [PATCH]  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>
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