[RFC PATCH 1/2] net: dsa: return early if there is no master

[Vladimir Oltean]

On Tue, Feb 23, 2021 at 05:19:05PM +0100, Michael Walle wrote:
> It doesn't make sense to have DSA without a master port. Error out early
> if there is no master port.
> 
> Fixes: fc054d563bfb ("net: Introduce DSA class for Ethernet switches")
> Signed-off-by: Michael Walle <michael at walle.cc>
> ---

Reviewed-by: Vladimir Oltean <vladimir.oltean at nxp.com>

I think you can also be more aggressive and remove the checks:

	if (!master)
		return -EINVAL;

from dsa_port_send and dsa_port_recv. At least it sounds broken to me
that this could ever happen.