Re: [RFC PATCH net-next 07/11] net: dsa: microchip: lan937x: update switch register

[Andrew Lunn]

On Thu, Feb 02, 2023 at 06:29:26PM +0530, Rakesh Sankaranarayanan wrote:
> Second switch in cascaded connection doesn't have port with macb
> interface. dsa_switch_register returns error if macb interface is
> not up. Due to this reason, second switch in cascaded connection will
> not report error during dsa_switch_register and mib thread work will be
> invoked even if actual switch register is not done. This will lead to
> kernel warning and it can be avoided by checking device tree setup
> status. This will return true only after actual switch register is done.

What i think you need to do is move the code into ksz_setup().

With a D in DSA setup, dsa_switch_register() adds the switch to the
list of switches, and then a check is performed to see if all switches
in the cluster have been registered. If not, it just returns. If all
switches have been registered, it then iterates over all the switches
can calls dsa_switch_ops.setup().

By moving the start of the MIB counter into setup(), it will only be
started once all the switches are present, and it means you don't need
to look at DSA core internal state.

	Andrew