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authorDarren Hart <dvhltc@us.ibm.com>2009-10-07 11:46:54 -0700
committerThomas Gleixner <tglx@linutronix.de>2009-10-07 21:22:03 +0200
commitda085681014fb43d67d9bf6d14bc068e9254bd49 (patch)
treea044706690151ad641ce8beee4d798248b962230
parentf8d1e548931cfa5ea9a082e020c2a47d27e5d793 (diff)
downloadop-kernel-dev-da085681014fb43d67d9bf6d14bc068e9254bd49.zip
op-kernel-dev-da085681014fb43d67d9bf6d14bc068e9254bd49.tar.gz
futex: fix requeue_pi key imbalance
If futex_wait_requeue_pi() wakes prior to requeue, we drop the reference to the source futex_key twice, once in handle_early_requeue_pi_wakeup() and once on our way out. Remove the drop from the handle_early_requeue_pi_wakeup() and keep the get/drops together in futex_wait_requeue_pi(). Reported-by: Helge Bahmann <hcb@chaoticmind.net> Signed-off-by: Darren Hart <dvhltc@us.ibm.com> Cc: Helge Bahmann <hcb@chaoticmind.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Dinakar Guniguntala <dino@in.ibm.com> Cc: John Stultz <johnstul@us.ibm.com> Cc: stable-2.6.31 <stable@kernel.org> LKML-Reference: <4ACCE21E.5030805@us.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--kernel/futex.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/futex.c b/kernel/futex.c
index 1e176f3..c3bb2fc 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2111,7 +2111,6 @@ int handle_early_requeue_pi_wakeup(struct futex_hash_bucket *hb,
* Unqueue the futex_q and determine which it was.
*/
plist_del(&q->list, &q->list.plist);
- drop_futex_key_refs(&q->key);
if (timeout && !timeout->task)
ret = -ETIMEDOUT;
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