linux-kernel - Re: [PATCH 1/2] net: dsa: microchip: set the correct number of ports in dsa

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Date:   Wed, 1 Jul 2020 19:09:28 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        woojung.huh@...rochip.com, UNGLinuxDriver@...rochip.com,
        vivien.didelot@...il.com, f.fainelli@...il.com,
        davem@...emloft.net, kuba@...nel.org, nicolas.ferre@...rochip.com
Subject: Re: [PATCH 1/2] net: dsa: microchip: set the correct number of ports
 in dsa_switch

On Wed, Jul 01, 2020 at 07:51:27PM +0300, Codrin Ciubotariu wrote:
> The number of ports is incorrectly set to the maximum available for a DSA
> switch. Even if the extra ports are not used, this causes some functions
> to be called later, like port_disable() and port_stp_state_set(). If the
> driver doesn't check the port index, it will end up modifying unknown
> registers.
> 
> Fixes: b987e98e50ab ("dsa: add DSA switch driver for Microchip KSZ9477")

Hi Codrin

You don't indicate which tree this is for. net-next, or net?  It looks
like it fixes a real issue, so it probably should be for net. But
patches to net should be minimal. Is it possible to do the

	ds->num_ports = swdev->port_cnt;

without all the other changes? You can then have a refactoring patch
in net-next.

Thanks
	Andrew