/*
* Same as __wtd_down, but sem->sleepers is not incremented when
* coming from a wakeup.
*/
void wtd_down_common(struct semaphore * sem, struct worktodo *wtd,
int do_incr)
{
int gotit;
int sleepers;
init_waitqueue_func_entry(&wtd->wait, __wtd_down_waiter);
wtd->data = sem;
spin_lock_irq(&semaphore_lock);
sem->sleepers += do_incr;
sleepers = sem->sleepers;
gotit = add_wait_queue_exclusive_cond(&sem->wait, &wtd->wait,
atomic_add_negative(sleepers - 1, &sem->count));
if (gotit)
sem->sleepers = 0;
else
sem->sleepers = 1;
spin_unlock_irq(&semaphore_lock);
if (gotit) {
wake_up(&sem->wait);
wtd_queue(wtd);
}
}
void __wtd_down_waiter(wait_queue_t *wait)
{
struct worktodo *wtd = (struct worktodo *)wait;
struct semaphore *sem = wtd->data;
__remove_wait_queue(&sem->wait, &wtd->wait);
wtd_push(wtd, __wtd_down_action, wtd);
wtd_queue(wtd);
}
static void skb_async_read_waiter(wait_queue_t *wait)
{
struct skb_async_info *info = (void *)wait;
__remove_wait_queue(info->sk->sleep, &info->wtd.wait);
wtd_queue(&info->wtd);
}
