From: Jens Axboe <axboe@fb.com>
Date: Mon, 8 Dec 2014 15:49:06 +0000 (-0700)
Subject: blk-mq: re-check for available tags after running the hardware queue
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~92^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=080ff3511450fd73948697fef34a3cc382675b59;p=pandora-kernel.git

blk-mq: re-check for available tags after running the hardware queue

If we run out of tags and have to sleep, we run the hardware queue
to kick pending IO into gear. During that run, we may have completed
requests, so re-check if we have free tags before going to sleep.

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