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Diffstat (limited to 'kernel/futex.c')
-rw-r--r--kernel/futex.c30
1 files changed, 14 insertions, 16 deletions
diff --git a/kernel/futex.c b/kernel/futex.c
index cc1034038285..af022919933a 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -916,7 +916,7 @@ void exit_pi_state_list(struct task_struct *curr)
pi_state->owner = NULL;
raw_spin_unlock_irq(&curr->pi_lock);
- rt_mutex_unlock(&pi_state->pi_mutex);
+ rt_mutex_futex_unlock(&pi_state->pi_mutex);
spin_unlock(&hb->lock);
@@ -1364,20 +1364,18 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *top_waiter
pi_state->owner = new_owner;
raw_spin_unlock(&new_owner->pi_lock);
- raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock);
-
- deboost = rt_mutex_futex_unlock(&pi_state->pi_mutex, &wake_q);
-
/*
- * First unlock HB so the waiter does not spin on it once he got woken
- * up. Second wake up the waiter before the priority is adjusted. If we
- * deboost first (and lose our higher priority), then the task might get
- * scheduled away before the wake up can take place.
+ * We've updated the uservalue, this unlock cannot fail.
*/
+ deboost = __rt_mutex_futex_unlock(&pi_state->pi_mutex, &wake_q);
+
+ raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock);
spin_unlock(&hb->lock);
- wake_up_q(&wake_q);
- if (deboost)
+
+ if (deboost) {
+ wake_up_q(&wake_q);
rt_mutex_adjust_prio(current);
+ }
return 0;
}
@@ -2253,7 +2251,7 @@ static int fixup_owner(u32 __user *uaddr, struct futex_q *q, int locked)
* task acquired the rt_mutex after we removed ourself from the
* rt_mutex waiters list.
*/
- if (rt_mutex_trylock(&q->pi_state->pi_mutex)) {
+ if (rt_mutex_futex_trylock(&q->pi_state->pi_mutex)) {
locked = 1;
goto out;
}
@@ -2568,7 +2566,7 @@ retry_private:
if (!trylock) {
ret = rt_mutex_timed_futex_lock(&q.pi_state->pi_mutex, to);
} else {
- ret = rt_mutex_trylock(&q.pi_state->pi_mutex);
+ ret = rt_mutex_futex_trylock(&q.pi_state->pi_mutex);
/* Fixup the trylock return value: */
ret = ret ? 0 : -EWOULDBLOCK;
}
@@ -2591,7 +2589,7 @@ retry_private:
* it and return the fault to userspace.
*/
if (ret && (rt_mutex_owner(&q.pi_state->pi_mutex) == current))
- rt_mutex_unlock(&q.pi_state->pi_mutex);
+ rt_mutex_futex_unlock(&q.pi_state->pi_mutex);
/* Unqueue and drop the lock */
unqueue_me_pi(&q);
@@ -2898,7 +2896,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
spin_lock(q.lock_ptr);
ret = fixup_pi_state_owner(uaddr2, &q, current);
if (ret && rt_mutex_owner(&q.pi_state->pi_mutex) == current)
- rt_mutex_unlock(&q.pi_state->pi_mutex);
+ rt_mutex_futex_unlock(&q.pi_state->pi_mutex);
/*
* Drop the reference to the pi state which
* the requeue_pi() code acquired for us.
@@ -2938,7 +2936,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
* userspace.
*/
if (ret && rt_mutex_owner(pi_mutex) == current)
- rt_mutex_unlock(pi_mutex);
+ rt_mutex_futex_unlock(pi_mutex);
/* Unqueue and drop the lock. */
unqueue_me_pi(&q);