From 49fd524f95cb4cc699d435e0ebb08b1c6220da6d Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@fb.com>
Date: Wed, 16 Apr 2014 10:57:18 -0600
Subject: [PATCH] bsg: update check for rq based driver for blk-mq

bsg currently checks ->request_fn to check whether a queue can
handle struct request. But with blk-mq, we don't have a request_fn
yet are request based. Add a queue_is_rq_based() helper and use
that in bsg, I'm guessing this is not the last place we need to
update for this. Besides, it better explains what is being
checked.

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