can: gs_usb: fix return value of the "set_bittiming" callback

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>

diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index 68ac3e88a8cecbe5b4a58da8491756ad5c26039a..8bf80ad9dc44cf4622811bc1fab31404c50cfb95 100644 (file)
--- 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 net_device *netdev)
                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)