From: Jens Axboe <axboe@fb.com>
Date: Tue, 16 Sep 2014 16:37:37 +0000 (-0600)
Subject: blk-mq: request deadline must be visible before marking rq as started
X-Git-Tag: fixes-for-v3.18-merge-window~80^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=538b75341835e3c2041ff066408de10d24fdc830;p=pandora-kernel.git

blk-mq: request deadline must be visible before marking rq as started

When we start the request, we set the deadline and flip the bits
marking the request as started and non-complete. However, it's
important that the deadline store is ordered before flipping the
bits, otherwise we could have a small window where the request is
marked started but with an invalid deadline. This can confuse the
timeout handling.

Suggested-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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