RTNETLINK answers: Argument list too long

Question

I backported mcp251xfd CAN driver for v4.9 I can see now can0 in ifconfig but when I do:

$ sudo ip link set can0 type can bitrate 125000
$ sudo ip link set up can0

I get the following: RTNETLINK answers: Argument list too long

It comes from the second command.

Answer 1

I needed to comment out the check here: https://elixir.bootlin.com/linux/v4.9.170/source/drivers/base/regmap/regmap.c#L1730

These lines:

if (map->max_raw_write && map->max_raw_write < val_len)
        return -E2BIG;

I saw that there no such check in newer kernel versions.