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Merge branch 'for-linus' of git://git.kernel.dk/linux-block

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* 'for-linus' of git://git.kernel.dk/linux-block:
  cfq-iosched: fix use-after-free of cfqq
This commit is contained in:
Linus Torvalds 2012-01-17 12:41:10 -08:00
parent 00b1d444af 54b466e44b
commit 5e5997849a
1 changed files with 3 additions and 4 deletions
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7
block/cfq-iosched.c
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@ -3117,18 +3117,17 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
*/
static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq)
{
struct cfq_queue *old_cfqq = cfqd->active_queue;
cfq_log_cfqq(cfqd, cfqq, "preempt");
cfq_slice_expired(cfqd, 1);
/*
* workload type is changed, don't save slice, otherwise preempt
* doesn't happen
*/
if (cfqq_type(old_cfqq) != cfqq_type(cfqq))
if (cfqq_type(cfqd->active_queue) != cfqq_type(cfqq))
cfqq->cfqg->saved_workload_slice = 0;
cfq_slice_expired(cfqd, 1);
/*
* Put the new queue at the front of the of the current list,
* so we know that it will be selected next.