From cf4b50afc28cc4629f82f5591bef1db2ce129fdc Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@fb.com>
Date: Fri, 9 May 2014 14:54:08 -0600
Subject: [PATCH] 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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