[PATCH] can: peak_usb: fix missing CAN_ERR_FLAG when reporting error counters

[Stefan Günther]

When the device reports error counters, the driver incorrectly uses an
assignment (=) instead of a bitwise OR (|=) for CAN_ERR_CNT. This wipes
out the CAN_ERR_FLAG and CAN_ERR_CRTL flags, causing the error frame to
be sent to userspace as a regular CAN frame with ID 0x200.

Fix this by using a bitwise OR to preserve the flags.

Signed-off-by: Stefan Günther <stefangun@xxxxx>
---
 drivers/net/can/usb/peak_usb/pcan_usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c
index 9278a1522..235cf34d4 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
@@ -526,7 +526,7 @@ static int pcan_usb_decode_error(struct pcan_usb_msg_context *mc, u8 n,
 			/* Supply TX/RX error counters in case of
 			 * controller error.
 			 */
-			cf->can_id = CAN_ERR_CNT;
+			cf->can_id |= CAN_ERR_CNT;
 			cf->data[6] = mc->pdev->bec.txerr;
 			cf->data[7] = mc->pdev->bec.rxerr;
 		}
-- 
2.43.0