From 7c8a3679e3d8e9d92d58f282161760a0e247df97 Mon Sep 17 00:00:00 2001
From: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
Date: Tue, 15 Oct 2013 16:42:19 -0600
Subject: [PATCH] elevator: acquire q->sysfs_lock in elevator_change()

Add locking of q->sysfs_lock into elevator_change() (an exported function)
to ensure it is held to protect q->elevator from elevator_init(), even if
elevator_change() is called from non-sysfs paths.
sysfs path (elv_iosched_store) uses __elevator_change(), non-locking
version, as the lock is already taken by elv_iosched_store().

Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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