From 6b55e1f2d0a5e462e52678278ab749468f1db81c Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@fb.com>
Date: Fri, 19 Sep 2014 08:04:53 -0600
Subject: [PATCH] blk-mq: fix potential oops on out-of-memory in
 __blk_mq_alloc_rq_maps()

__blk_mq_alloc_rq_maps() can be invoked multiple times, if we scale
back the queue depth if we are low on memory. So don't clear
set->tags when we fail, this is handled directly in
the parent function, blk_mq_alloc_tag_set().

Reported-by: Robert Elliott  <Elliott@hp.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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