tree 9170df5fb0e26d77d45017069b7756f7c80afde5
parent 9a11b4ed0e7c44bca7c939aa544c3c47aae40c12
author Jens Axboe <jens.axboe@oracle.com> 1212046522 +0200
committer Jens Axboe <jens.axboe@oracle.com> 1215084072 +0200

as-iosched: properly protect ioc_gone and ioc count

If we have multiple tasks freeing io contexts when as-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 as-iosched
is being rmmod'ed).

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