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[PATCH] CFQ io scheduler: scheduler switch oops

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If cfq is managing a queue and a new scheduler is later selected, it is
possible for the cfqd unplug_work work to be queued after the kblockd
work struct has been flushed.  The problem is the ordering of
cfq_shutdown_timer_wq() and blk_put_queue() in cfq_put_cfqd().  The
latter may rearm the work, leaving cfq_kick_queue() with dead data.

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jens Axboe 2005-06-27 14:49:39 +02:00 committed by Linus Torvalds
parent 52a5e15f66
commit 96c51ce94e
1 changed files with 3 additions and 2 deletions
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5
drivers/block/cfq-iosched.c
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@ -2249,10 +2249,11 @@ static void cfq_put_cfqd(struct cfq_data *cfqd)
if (!atomic_dec_and_test(&cfqd->ref)) if (!atomic_dec_and_test(&cfqd->ref))
return; return;
cfq_shutdown_timer_wq(cfqd);
blk_put_queue(q); blk_put_queue(q);
cfq_shutdown_timer_wq(cfqd);
q->elevator->elevator_data = NULL;
mempool_destroy(cfqd->crq_pool); mempool_destroy(cfqd->crq_pool);
kfree(cfqd->crq_hash); kfree(cfqd->crq_hash);
kfree(cfqd->cfq_hash); kfree(cfqd->cfq_hash);