From: Bart Van Assche <bvanassche@acm.org>
Date: Mon, 8 Dec 2014 15:46:34 +0000 (-0700)
Subject: blk-mq: fix hang in bt_get()
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~92^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b32232073e80;p=pandora-kernel.git

blk-mq: fix hang in bt_get()

Avoid that if there are fewer hardware queues than CPU threads that
bt_get() can hang. The symptoms of the hang were as follows:

* All tags allocated for a particular hardware queue.
* (nr_tags) pending commands for that hardware queue.
* No pending commands for the software queues associated with that
  hardware queue.

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