From: Matthew Wilcox <matthew@wil.cx>
Date: Thu, 6 Dec 2007 17:29:54 +0000 (-0500)
Subject: Add wait_for_completion_killable
X-Git-Tag: firefly_0821_release~23618^2~2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=009e577e079656d51d0fe9b15e61e41b00816c29;p=firefly-linux-kernel-4.4.55.git

Add wait_for_completion_killable

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
---

diff --git a/include/linux/completion.h b/include/linux/completion.h
index 33d6aaf94447..d2961b66d53d 100644
--- a/include/linux/completion.h
+++ b/include/linux/completion.h
@@ -44,6 +44,7 @@ static inline void init_completion(struct completion *x)
 
 extern void wait_for_completion(struct completion *);
 extern int wait_for_completion_interruptible(struct completion *x);
+extern int wait_for_completion_killable(struct completion *x);
 extern unsigned long wait_for_completion_timeout(struct completion *x,
 						   unsigned long timeout);
 extern unsigned long wait_for_completion_interruptible_timeout(
diff --git a/kernel/sched.c b/kernel/sched.c
index 50a0faae585f..d2f77fab0f46 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3881,8 +3881,10 @@ do_wait_for_common(struct completion *x, long timeout, int state)
 		wait.flags |= WQ_FLAG_EXCLUSIVE;
 		__add_wait_queue_tail(&x->wait, &wait);
 		do {
-			if (state == TASK_INTERRUPTIBLE &&
-			    signal_pending(current)) {
+			if ((state == TASK_INTERRUPTIBLE &&
+			     signal_pending(current)) ||
+			    (state == TASK_KILLABLE &&
+			     fatal_signal_pending(current))) {
 				__remove_wait_queue(&x->wait, &wait);
 				return -ERESTARTSYS;
 			}
@@ -3942,6 +3944,15 @@ wait_for_completion_interruptible_timeout(struct completion *x,
 }
 EXPORT_SYMBOL(wait_for_completion_interruptible_timeout);
 
+int __sched wait_for_completion_killable(struct completion *x)
+{
+	long t = wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_KILLABLE);
+	if (t == -ERESTARTSYS)
+		return t;
+	return 0;
+}
+EXPORT_SYMBOL(wait_for_completion_killable);
+
 static long __sched
 sleep_on_common(wait_queue_head_t *q, int state, long timeout)
 {