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can: mcp251xfd: mcp251xfd_hw_rx_obj_to_skb(): don't copy data for RTR CAN frames in RX-path

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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>
This commit is contained in:
Marc Kleine-Budde 2020-12-21 21:34:50 +01:00
parent 561aa5b4ce
commit e20b85c7eb
1 changed files with 2 additions and 1 deletions
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3
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
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@ -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