From d5b42e6607661b198d8b26a0c30969605b1bf5c7 Mon Sep 17 00:00:00 2001
From: Wolfgang Grandegger <wg@grandegger.com>
Date: Wed, 13 Dec 2017 19:52:23 +0100
Subject: [PATCH] can: gs_usb: fix return value of the "set_bittiming" callback
Git-commit: d5b42e6607661b198d8b26a0c30969605b1bf5c7
Patch-mainline: v4.15-rc8
References: bsc#1051510

The "set_bittiming" callback treats a positive return value as error!
For that reason "can_changelink()" will quit silently after setting
the bittiming values without processing ctrlmode, restart-ms, etc.

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/can/usb/gs_usb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -449,7 +449,7 @@ static int gs_usb_set_bittiming(struct n
 		dev_err(netdev->dev.parent, "Couldn't set bittimings (err=%d)",
 			rc);
 
-	return rc;
+	return (rc > 0) ? 0 : rc;
 }
 
 static void gs_usb_xmit_callback(struct urb *urb)