tree 438312dda8a63e0704c2ddbdea958f0d729c6c7e
parent c461a973118346d5c103aaaddd62e53939fd7c67
author Jens Axboe <jens.axboe@oracle.com> 1212046328 +0200
committer Jens Axboe <jens.axboe@oracle.com> 1215084072 +0200

cfq-iosched: properly protect ioc_gone and ioc count

If we have multiple tasks freeing cfq_io_contexts when cfq-iosched
is being unloaded, we could complete() ioc_gone twice. Fix that by
protecting ioc_gone complete() and clearing with a spinlock for
just that purpose. Doesn't matter from a performance perspective,
since it'll only enter that path when ioc_gone != NULL (when cfq-iosched
is being rmmod'ed).

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