linux-kernel - fix queue_lock usage in blk-mq and nvme

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Date:	Thu,  7 May 2015 09:38:12 +0200
From:	Christoph Hellwig <hch@....de>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: fix queue_lock usage in blk-mq and nvme

Historically we always take queue_lock with irqs disabled.  Blk-mq doesn't really
use the queue_lock much, but when it does it needs to follow this rules to make
lockdep happy.

The first patch removes a queue_lock usage instead of fixing things properly,
and the second is a bad-aid for nvme.  In the long run I'd prefer to remove
other users of the queue_lock from blk-mq and blk-mq based driver entirely,
but that will require a bit more work.

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