From: Jens Axboe <jaxboe@fusionio.com>
Date: Tue, 19 Apr 2011 07:10:35 +0000 (+0200)
Subject: cfq-iosched: read_lock() does not always imply rcu_read_lock()
X-Git-Tag: v2.6.39-rc5~38^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f45c69589b7d2953584e6cd0b31e35dbe960ad0;p=pandora-kernel.git

cfq-iosched: read_lock() does not always imply rcu_read_lock()

For some configurations of CONFIG_PREEMPT that is not true. So
get rid of __call_for_each_cic() and always uses the explicitly
rcu_read_lock() protected call_for_each_cic() instead.

This fixes a potential bug related to IO scheduler removal or
online switching.

Thanks to Paul McKenney for clarifying this.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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