From: Ming Lei <ming.lei@canonical.com>
Date: Wed, 3 Dec 2014 11:38:04 +0000 (+0800)
Subject: blk-mq: prevent unmapped hw queue from being scheduled
X-Git-Tag: omap-for-v3.19/fixes-rc1~95^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=19c66e59ce57e7b181625cbb408d48eb10837763;p=pandora-kernel.git

blk-mq: prevent unmapped hw queue from being scheduled

When one hardware queue has no mapped software queues, it
shouldn't have been scheduled. Otherwise WARNING or OOPS
can triggered.

blk_mq_hw_queue_mapped() helper is introduce for fixing
the problem.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
---

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