From: Tejun Heo <tj@kernel.org>
Date: Mon, 5 Mar 2012 21:14:57 +0000 (-0800)
Subject: elevator: make elevator_init_fn() return 0/-errno
X-Git-Tag: v3.5-rc1~42^2~89
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b2fab5acd28ead6f0dd6c3996ba23f0ef1772f15;p=pandora-kernel.git

elevator: make elevator_init_fn() return 0/-errno

elevator_ops->elevator_init_fn() has a weird return value.  It returns
a void * which the caller should assign to q->elevator->elevator_data
and %NULL return denotes init failure.

Update such that it returns integer 0/-errno and sets elevator_data
directly as necessary.

This makes the interface more conventional and eases further cleanup.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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