[PATCH can-next 10/13] can: gs_usb: gs_update_state(): set CAN_ERR_CNT if device sends CAN error counters

[Marc Kleine-Budde]

Some gs_usb compatible firmware send the CAN error counters in CAN error
frames, but doesn't set CAN_ERR_CNT in can_id.

Fixup the CAN error frame by setting CAN_ERR_CNT, if RX or TX error
counters are greater than 0.

Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
---
 drivers/net/can/usb/gs_usb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index 2848cb1a75f0..186abc95c977 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -540,6 +540,10 @@ static void gs_update_state(struct gs_can *dev, struct can_frame *cf,
 			 CAN_ERR_CRTL_RX_PASSIVE | CAN_ERR_CRTL_TX_PASSIVE |
 			 CAN_ERR_CRTL_ACTIVE);
 
+	/* some firmware sends CAN error counters but doesn't set CAN_ERR_CNT, fixup */
+	if (cf->data[6] || cf->data[7])
+		cf->can_id |= CAN_ERR_CNT;
+
 	const enum can_state new_state = max(rx_state, tx_state);
 
 	if (new_state == dev->can.state)

-- 
2.53.0