can: mcp251xfd: mcp251xfd_hw_rx_obj_to_skb(): don't copy data for RTR CAN frames...

In Classical CAN there are RTR frames. RTR frames have the RTR bit set, may
have a dlc != 0, but contain no data.

This patch changes the RX-path to no copy any data for RTR frames, so that the
data field in the CAN frame stays 0x0.

Link: https://lore.kernel.org/r/20210114153448.1506901-4-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
index aa992e7..92816be 100644 (file)
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
@@ -1474,7 +1474,8 @@ mcp251xfd_hw_rx_obj_to_skb(const struct mcp251xfd_priv *priv,
                                                 hw_rx_obj->flags));
        }
 
-       memcpy(cfd->data, hw_rx_obj->data, cfd->len);
+       if (!(hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_RTR))
+               memcpy(cfd->data, hw_rx_obj->data, cfd->len);
 }
 
 static int