From: Christoph Hellwig <hch@lst.de>
Date: Sat, 13 Sep 2014 23:40:09 +0000 (-0700)
Subject: blk-mq: call blk_mq_start_request from ->queue_rq
X-Git-Tag: fixes-against-v3.18-rc2~51^2~46
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e2490073cd7c3d6f6ef6e029a208edd4d38efac4;p=pandora-kernel.git

blk-mq: call blk_mq_start_request from ->queue_rq

When we call blk_mq_start_request from the core blk-mq code before calling into
->queue_rq there is a racy window where the timeout handler can hit before we've
fully set up the driver specific part of the command.

Move the call to blk_mq_start_request into the driver so the driver can start
the request only once it is fully set up.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
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