!1299 [sync] PR-1270: media: dvb-core: Fix kernel WARNING for blocking operation in wait_event*()

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/1270 
 
PR sync from: Chen Jiahao <chenjiahao16@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/LKM3OGRPHUFIBAXN26GKXPU4STERGPYH/ 
 
 
Link:https://gitee.com/openeuler/kernel/pulls/1299 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com> 
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com> 

drivers/media/dvb-core/dvb_frontend.c

@@ -292,14 +292,22 @@ static int dvb_frontend_get_event(struct dvb_frontend *fe,
 	}
 
 	if (events->eventw == events->eventr) {
-		int ret;
+		struct wait_queue_entry wait;
+		int ret = 0;
 
 		if (flags & O_NONBLOCK)
 			return -EWOULDBLOCK;
 
-		ret = wait_event_interruptible(events->wait_queue,
-					       dvb_frontend_test_event(fepriv, events));
-
+		init_waitqueue_entry(&wait, current);
+		add_wait_queue(&events->wait_queue, &wait);
+		while (!dvb_frontend_test_event(fepriv, events)) {
+			wait_woken(&wait, TASK_INTERRUPTIBLE, 0);
+			if (signal_pending(current)) {
+				ret = -ERESTARTSYS;
+				break;
+			}
+		}
+		remove_wait_queue(&events->wait_queue, &wait);
 		if (ret < 0)
 			return ret;
 	}