can: esd_usb2: Fix can_dlc value for received RTR, frames

commit 72d92e865d1560723e1957ee3f393688c49ca5bf upstream.

The dlc member of the struct rx_msg contains also the ESD_RTR flag to
mark received RTR frames. Without the fix the can_dlc value for received
RTR frames would always be set to 8 by get_can_dlc() instead of the
received value.

Fixes: 96d8e90382dc ("can: Add driver for esd CAN-USB/2 device")
Signed-off-by: Stefan Mätje <stefan.maetje@esd.eu>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/drivers/net/can/usb/esd_usb2.c b/drivers/net/can/usb/esd_usb2.c
index d5455c7606187551effafa94138d0fddd7aad506..503f37850fb3d50b20835b291d8f9c9fda125100 100644 (file)
--- a/drivers/net/can/usb/esd_usb2.c
+++ b/drivers/net/can/usb/esd_usb2.c
@@ -335,7 +335,7 @@ static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
                }
 
                cf->can_id = id & ESD_IDMASK;
-               cf->can_dlc = get_can_dlc(msg->msg.rx.dlc);
+               cf->can_dlc = get_can_dlc(msg->msg.rx.dlc & ~ESD_RTR);
 
                if (id & ESD_EXTID)
                        cf->can_id |= CAN_EFF_FLAG;