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authorVivek Goyal <vgoyal@redhat.com>2009-12-07 19:37:15 +0100
committerJens Axboe <axboe@carl.(none)>2009-12-07 19:37:15 +0100
commit878eaddd05d251cefa9632c2b8046833c5eead66 (patch)
treea5bf9b6c1856969ff7a7cd0d676ea2b419072103 /block
parentaccee7854b378a8ab5995d8f5dc5d8abc3b3d23a (diff)
downloadvexpress-lsk-878eaddd05d251cefa9632c2b8046833c5eead66.tar.gz
cfq-iosched: Do not access cfqq after freeing it
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)>
Diffstat (limited to 'block')
-rw-r--r--block/cfq-iosched.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 3815f9789b6..cfb0b2f5f63 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -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);
}
/*