}
if (__rt_mutex_futex_trylock(&pi_state->pi_mutex)) {
- /* We got the lock after all, nothing to fix. */
- ret = 0;
+ /* We got the lock. pi_state is correct. Tell caller. */
+ ret = 1;
goto out_unlock;
}
* We raced against a concurrent self; things are
* already fixed up. Nothing to do.
*/
- ret = 0;
+ ret = 1;
goto out_unlock;
}
newowner = argowner;
raw_spin_unlock(&newowner->pi_lock);
raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock);
- return 0;
+ return argowner == current;
/*
* In order to reschedule or handle a page fault, we need to drop the
* Check if someone else fixed it for us:
*/
if (pi_state->owner != oldowner) {
- ret = 0;
+ ret = argowner == current;
goto out_unlock;
}
*/
static int fixup_owner(u32 __user *uaddr, struct futex_q *q, int locked)
{
- int ret = 0;
-
if (locked) {
/*
* Got the lock. We might not be the anticipated owner if we
* stable state, anything else needs more attention.
*/
if (q->pi_state->owner != current)
- ret = fixup_pi_state_owner(uaddr, q, current);
- return ret ? ret : locked;
+ return fixup_pi_state_owner(uaddr, q, current);
+ return 1;
}
/*
* Another speculative read; pi_state->owner == current is unstable
* but needs our attention.
*/
- if (q->pi_state->owner == current) {
- ret = fixup_pi_state_owner(uaddr, q, NULL);
- return ret;
- }
+ if (q->pi_state->owner == current)
+ return fixup_pi_state_owner(uaddr, q, NULL);
/*
* Paranoia check. If we did not take the lock, then we should not be
q->pi_state->owner);
}
- return ret;
+ return 0;
}
/**
if (q.pi_state && (q.pi_state->owner != current)) {
spin_lock(q.lock_ptr);
ret = fixup_pi_state_owner(uaddr2, &q, current);
- if (ret && rt_mutex_owner(&q.pi_state->pi_mutex) == current) {
+ if (ret < 0 && rt_mutex_owner(&q.pi_state->pi_mutex) == current) {
pi_state = q.pi_state;
get_pi_state(pi_state);
}
*/
put_pi_state(q.pi_state);
spin_unlock(q.lock_ptr);
+ /*
+ * Adjust the return value. It's either -EFAULT or
+ * success (1) but the caller expects 0 for success.
+ */
+ ret = ret < 0 ? ret : 0;
}
} else {
struct rt_mutex *pi_mutex;