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cfq-iosched: fix RCU problem in cfq_cic_lookup()
authorJens Axboe <jens.axboe@oracle.com>
Wed, 28 May 2008 12:46:59 +0000 (14:46 +0200)
committerJens Axboe <jens.axboe@oracle.com>
Wed, 28 May 2008 12:49:28 +0000 (14:49 +0200)
cfq_cic_lookup() needs to properly protect ioc->ioc_data before
dereferencing it and also exclude updaters of ioc->ioc_data as well.

Also add a number of comments documenting why the existing RCU usage
is OK.

Thanks a lot to "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> for
review and comments!

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

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