From: Jens Axboe <axboe@fb.com>
Date: Tue, 27 May 2014 23:46:48 +0000 (-0600)
Subject: blk-mq: allow non-softirq completions
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~49^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=95f096849932fe5eaa7bfec887530cf556744a76;p=pandora-kernel.git

blk-mq: allow non-softirq completions

Right now we export two ways of completing a request:

1) blk_mq_complete_request(). This uses an IPI (if needed) and
   completes through q->softirq_done_fn(). It also works with
   timeouts.

2) blk_mq_end_io(). This completes inline, and ignores any timeout
   state of the request.

Let blk_mq_complete_request() handle non-softirq_done_fn completions
as well, by just completing inline. If a driver has enough completion
ports to place completions correctly, it need not define a
mq_ops->complete() and we can avoid an indirect function call by
doing the completion inline.

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