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cfq-iosched: Do not access cfqq after freeing it

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Fix a crash during boot reported by Jeff Moyer. Fix the issue of accessing
cfqq after freeing it.

Reported-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@carl.(none)>
This commit is contained in:
Vivek Goyal 2009-12-07 19:37:15 +01:00 committed by Jens Axboe
parent accee7854b
commit 878eaddd05
1 changed files with 4 additions and 3 deletions
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7
block/cfq-iosched.c
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@ -2368,7 +2368,7 @@ static int cfq_dispatch_requests(struct request_queue *q, int force)
static void cfq_put_queue(struct cfq_queue *cfqq)
{
struct cfq_data *cfqd = cfqq->cfqd;
struct cfq_group *cfqg;
struct cfq_group *cfqg, *orig_cfqg;
BUG_ON(atomic_read(&cfqq->ref) <= 0);
@ -2379,6 +2379,7 @@ static void cfq_put_queue(struct cfq_queue *cfqq)
BUG_ON(rb_first(&cfqq->sort_list));
BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]);
cfqg = cfqq->cfqg;
orig_cfqg = cfqq->orig_cfqg;
if (unlikely(cfqd->active_queue == cfqq)) {
__cfq_slice_expired(cfqd, cfqq, 0);
@ -2388,8 +2389,8 @@ static void cfq_put_queue(struct cfq_queue *cfqq)
BUG_ON(cfq_cfqq_on_rr(cfqq));
kmem_cache_free(cfq_pool, cfqq);
cfq_put_cfqg(cfqg);
if (cfqq->orig_cfqg)
cfq_put_cfqg(cfqq->orig_cfqg);
if (orig_cfqg)
cfq_put_cfqg(orig_cfqg);
}
/*