tree 7f920cebcbbe6a1435975e355cee15289ddbc428
parent bd900d4580107c899d43b262fbbd995f11097a43
author Jens Axboe <jaxboe@fusionio.com> 1303197035 +0200
committer Jens Axboe <jaxboe@fusionio.com> 1303197035 +0200

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>