From: Jens Axboe <axboe@fb.com>
Date: Wed, 10 Jun 2015 14:01:20 +0000 (-0600)
Subject: cfq-iosched: fix the setting of IOPS mode on SSDs
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~120^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0bb979472a7401022109e81dd89d777adea58710;p=pandora-kernel.git

cfq-iosched: fix the setting of IOPS mode on SSDs

A previous commit wanted to make CFQ default to IOPS mode on
non-rotational storage, however it did so when the queue was
initialized and the non-rotational flag is only set later on
in the probe.

Add an elevator hook that gets called off the add_disk() path,
at that point we know that feature probing has finished, and
we can reliably check for the various flags that drivers can
set.

Fixes: 41c0126b ("block: Make CFQ default to IOPS mode on SSDs")
Tested-by: Romain Francoise <romain@orebokech.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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