diff options
Diffstat (limited to 'kernel/futex/waitwake.c')
-rw-r--r-- | kernel/futex/waitwake.c | 80 |
1 files changed, 47 insertions, 33 deletions
diff --git a/kernel/futex/waitwake.c b/kernel/futex/waitwake.c index ba01b9408203..37860f794bf7 100644 --- a/kernel/futex/waitwake.c +++ b/kernel/futex/waitwake.c @@ -145,16 +145,19 @@ int futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset) struct futex_hash_bucket *hb; struct futex_q *this, *next; union futex_key key = FUTEX_KEY_INIT; - int ret; DEFINE_WAKE_Q(wake_q); + int ret; if (!bitset) return -EINVAL; - ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &key, FUTEX_READ); + ret = get_futex_key(uaddr, flags, &key, FUTEX_READ); if (unlikely(ret != 0)) return ret; + if ((flags & FLAGS_STRICT) && !nr_wake) + return 0; + hb = futex_hash(&key); /* Make sure we really have tasks to wakeup */ @@ -245,10 +248,10 @@ int futex_wake_op(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2, DEFINE_WAKE_Q(wake_q); retry: - ret = get_futex_key(uaddr1, flags & FLAGS_SHARED, &key1, FUTEX_READ); + ret = get_futex_key(uaddr1, flags, &key1, FUTEX_READ); if (unlikely(ret != 0)) return ret; - ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, FUTEX_WRITE); + ret = get_futex_key(uaddr2, flags, &key2, FUTEX_WRITE); if (unlikely(ret != 0)) return ret; @@ -419,11 +422,11 @@ static int futex_wait_multiple_setup(struct futex_vector *vs, int count, int *wo */ retry: for (i = 0; i < count; i++) { - if ((vs[i].w.flags & FUTEX_PRIVATE_FLAG) && retry) + if (!(vs[i].w.flags & FLAGS_SHARED) && retry) continue; ret = get_futex_key(u64_to_user_ptr(vs[i].w.uaddr), - !(vs[i].w.flags & FUTEX_PRIVATE_FLAG), + vs[i].w.flags, &vs[i].q.key, FUTEX_READ); if (unlikely(ret)) @@ -435,7 +438,7 @@ retry: for (i = 0; i < count; i++) { u32 __user *uaddr = (u32 __user *)(unsigned long)vs[i].w.uaddr; struct futex_q *q = &vs[i].q; - u32 val = (u32)vs[i].w.val; + u32 val = vs[i].w.val; hb = futex_q_lock(q); ret = futex_get_value_locked(&uval, uaddr); @@ -599,7 +602,7 @@ int futex_wait_setup(u32 __user *uaddr, u32 val, unsigned int flags, * while the syscall executes. */ retry: - ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &q->key, FUTEX_READ); + ret = get_futex_key(uaddr, flags, &q->key, FUTEX_READ); if (unlikely(ret != 0)) return ret; @@ -629,20 +632,18 @@ retry_private: return ret; } -int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val, ktime_t *abs_time, u32 bitset) +int __futex_wait(u32 __user *uaddr, unsigned int flags, u32 val, + struct hrtimer_sleeper *to, u32 bitset) { - struct hrtimer_sleeper timeout, *to; - struct restart_block *restart; - struct futex_hash_bucket *hb; struct futex_q q = futex_q_init; + struct futex_hash_bucket *hb; int ret; if (!bitset) return -EINVAL; + q.bitset = bitset; - to = futex_setup_timer(abs_time, &timeout, flags, - current->timer_slack_ns); retry: /* * Prepare to wait on uaddr. On success, it holds hb->lock and q @@ -650,18 +651,17 @@ retry: */ ret = futex_wait_setup(uaddr, val, flags, &q, &hb); if (ret) - goto out; + return ret; /* futex_queue and wait for wakeup, timeout, or a signal. */ futex_wait_queue(hb, &q, to); /* If we were woken (and unqueued), we succeeded, whatever. */ - ret = 0; if (!futex_unqueue(&q)) - goto out; - ret = -ETIMEDOUT; + return 0; + if (to && !to->task) - goto out; + return -ETIMEDOUT; /* * We expect signal_pending(current), but we might be the @@ -670,24 +670,38 @@ retry: if (!signal_pending(current)) goto retry; - ret = -ERESTARTSYS; - if (!abs_time) - goto out; + return -ERESTARTSYS; +} - restart = ¤t->restart_block; - restart->futex.uaddr = uaddr; - restart->futex.val = val; - restart->futex.time = *abs_time; - restart->futex.bitset = bitset; - restart->futex.flags = flags | FLAGS_HAS_TIMEOUT; +int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val, ktime_t *abs_time, u32 bitset) +{ + struct hrtimer_sleeper timeout, *to; + struct restart_block *restart; + int ret; - ret = set_restart_fn(restart, futex_wait_restart); + to = futex_setup_timer(abs_time, &timeout, flags, + current->timer_slack_ns); -out: - if (to) { - hrtimer_cancel(&to->timer); - destroy_hrtimer_on_stack(&to->timer); + ret = __futex_wait(uaddr, flags, val, to, bitset); + + /* No timeout, nothing to clean up. */ + if (!to) + return ret; + + hrtimer_cancel(&to->timer); + destroy_hrtimer_on_stack(&to->timer); + + if (ret == -ERESTARTSYS) { + restart = ¤t->restart_block; + restart->futex.uaddr = uaddr; + restart->futex.val = val; + restart->futex.time = *abs_time; + restart->futex.bitset = bitset; + restart->futex.flags = flags | FLAGS_HAS_TIMEOUT; + + return set_restart_fn(restart, futex_wait_restart); } + return ret; } |