From 7841d554809b518a22349e7e39b6b63f8a48d0fb Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 4 Oct 2017 20:43:35 +0200
Subject: [PATCH] Bluetooth: hci_uart_set_flow_control: Fix NULL deref when using serdev
Git-commit: 7841d554809b518a22349e7e39b6b63f8a48d0fb
Patch-mainline: v4.15-rc1
References: bsc#1051510

Fix a NULL pointer deref (hu->tty) when calling hci_uart_set_flow_control
on hci_uart-s using serdev.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/bluetooth/hci_ldisc.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -41,6 +41,7 @@
 #include <linux/ioctl.h>
 #include <linux/skbuff.h>
 #include <linux/firmware.h>
+#include <linux/serdev.h>
 
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
@@ -280,6 +281,12 @@ void hci_uart_set_flow_control(struct hc
 	unsigned int set = 0;
 	unsigned int clear = 0;
 
+	if (hu->serdev) {
+		serdev_device_set_flow_control(hu->serdev, !enable);
+		serdev_device_set_rts(hu->serdev, !enable);
+		return;
+	}
+
 	if (enable) {
 		/* Disable hardware flow control */
 		ktermios = tty->termios;