[PATCH 3/6] can: mcp251xfd: mcp251xfd_hw_rx_obj_to_skb(): don't copy data for RTR CAN frames in RX-path
From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: 2021-01-14 15:35:37
Subsystem:
can network drivers, mcp251xfd spi-can network driver, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Manivannan Sadhasivam, Linus Torvalds
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. Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> --- drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
index a8470e081ff0..023b993a3b09 100644
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c@@ -1473,7 +1473,8 @@ 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
--
2.29.2