X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=drivers%2Ftty%2Ftty_buffer.c;h=3cd31e0d4bd9545b5357cda0ffa14373d181e670;hb=e2b0a1613200a044b0e5e3a78d157ab746a7a4fa;hp=9a479e61791a2a80cd0ae3fd5c93c6d0873d6998;hpb=d9f67dbc0f55e67dd18fc18fa05a9d5d2bd52914;p=firefly-linux-kernel-4.4.55.git

diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 9a479e61791a..3cd31e0d4bd9 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -450,7 +450,7 @@ receive_buf(struct tty_struct *tty, struct tty_buffer *head, int count)
 		count = disc->ops->receive_buf2(tty, p, f, count);
 	else {
 		count = min_t(int, count, tty->receive_room);
-		if (count)
+		if (count && disc->ops->receive_buf)
 			disc->ops->receive_buf(tty, p, f, count);
 	}
 	return count;