From: Jens Axboe <axboe@fb.com>
Date: Fri, 9 May 2014 20:54:08 +0000 (-0600)
Subject: blk-mq: fix race in IO start accounting
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~49^2~43
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cf4b50afc28cc4629f82f5591bef1db2ce129fdc;p=pandora-kernel.git

blk-mq: fix race in IO start accounting

Commit c6d600c6 opened up a small race where we could attempt to
account IO completion on a request, racing with IO start accounting.
Fix this up by ensuring that we've accounted for IO start before
inserting the request.

Signed-off-by: Jens Axboe <axboe@fb.com>
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