USB: usbmon: fix bug in mon_buff_area_shrink

[safe/jmp/linux-2.6] / kernel / futex.c

diff --git a/kernel/futex.c b/kernel/futex.c
index 5c88839..fb65e82 100644 (file)
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -150,7 +150,8 @@ static struct futex_hash_bucket *hash_futex(union futex_key *key)
  */
 static inline int match_futex(union futex_key *key1, union futex_key *key2)
 {
-       return (key1->both.word == key2->both.word
+       return (key1 && key2
+               && key1->both.word == key2->both.word
                && key1->both.ptr == key2->both.ptr
                && key1->both.offset == key2->both.offset);
 }
@@ -1028,7 +1029,6 @@ static inline
 void requeue_pi_wake_futex(struct futex_q *q, union futex_key *key,
                           struct futex_hash_bucket *hb)
 {
-       drop_futex_key_refs(&q->key);
        get_futex_key_refs(key);
        q->key = *key;
 
@@ -1226,6 +1226,7 @@ retry_private:
                 */
                if (ret == 1) {
                        WARN_ON(pi_state);
+                       drop_count++;
                        task_count++;
                        ret = get_futex_value_locked(&curval2, uaddr2);
                        if (!ret)
@@ -1304,6 +1305,7 @@ retry_private:
                        if (ret == 1) {
                                /* We got the lock. */
                                requeue_pi_wake_futex(this, &key2, hb2);
+                               drop_count++;
                                continue;
                        } else if (ret) {
                                /* -EDEADLK */
@@ -2125,7 +2127,7 @@ int handle_early_requeue_pi_wakeup(struct futex_hash_bucket *hb,
                plist_del(&q->list, &q->list.plist);
 
                /* Handle spurious wakeups gracefully */
-               ret = -EAGAIN;
+               ret = -EWOULDBLOCK;
                if (timeout && !timeout->task)
                        ret = -ETIMEDOUT;
                else if (signal_pending(current))
@@ -2206,7 +2208,6 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
        debug_rt_mutex_init_waiter(&rt_waiter);
        rt_waiter.task = NULL;
 
-retry:
        key2 = FUTEX_KEY_INIT;
        ret = get_futex_key(uaddr2, fshared, &key2, VERIFY_WRITE);
        if (unlikely(ret != 0))
@@ -2301,9 +2302,6 @@ out_put_keys:
 out_key2:
        put_futex_key(fshared, &key2);
 
-       /* Spurious wakeup ? */
-       if (ret == -EAGAIN)
-               goto retry;
 out:
        if (to) {
                hrtimer_cancel(&to->timer);