pwm: imx: support output polarity inversion

[karo-tx-linux.git] / kernel / wait.c

diff --git a/kernel/wait.c b/kernel/wait.c
index d550920e040c4515c7c865bb6ba2ab884f7ef7bd..de21c6305a44fe913f84bcbf8115d3ae4f1b2335 100644 (file)
--- a/kernel/wait.c
+++ b/kernel/wait.c
@@ -92,6 +92,30 @@ prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int state)
 }
 EXPORT_SYMBOL(prepare_to_wait_exclusive);
 
+long prepare_to_wait_event(wait_queue_head_t *q, wait_queue_t *wait, int state)
+{
+       unsigned long flags;
+
+       if (signal_pending_state(state, current))
+               return -ERESTARTSYS;
+
+       wait->private = current;
+       wait->func = autoremove_wake_function;
+
+       spin_lock_irqsave(&q->lock, flags);
+       if (list_empty(&wait->task_list)) {
+               if (wait->flags & WQ_FLAG_EXCLUSIVE)
+                       __add_wait_queue_tail(q, wait);
+               else
+                       __add_wait_queue(q, wait);
+       }
+       set_current_state(state);
+       spin_unlock_irqrestore(&q->lock, flags);
+
+       return 0;
+}
+EXPORT_SYMBOL(prepare_to_wait_event);
+
 /**
  * finish_wait - clean up after waiting in a queue
  * @q: waitqueue waited on