Re: [PATCH net] net: dsa: microchip: Fix KSZ9477 HSR port setup issue

[Frieder Schrempf <frieder.schrempf@kontron.de>]

Am 19.08.25 um 03:04 schrieb Tristram.Ha@microchip.com:
> From: Tristram Ha <tristram.ha@microchip.com>
> 
> ksz9477_hsr_join() is called once to setup the HSR port membership, but
> the port can be enabled later, or disabled and enabled back and the port
> membership is not set correctly inside ksz_update_port_member().  The
> added code always use the correct HSR port membership for HSR port that
> is enabled.
> 
> Fixes: 2d61298fdd7b ("net: dsa: microchip: Enable HSR offloading for KSZ9477")
> Reported-by: Frieder Schrempf <frieder.schrempf@kontron.de>
> Signed-off-by: Tristram Ha <tristram.ha@microchip.com>

Tested-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>

> ---
>  drivers/net/dsa/microchip/ksz_common.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
> index 4cb14288ff0f..9568cc391fe3 100644
> --- a/drivers/net/dsa/microchip/ksz_common.c
> +++ b/drivers/net/dsa/microchip/ksz_common.c
> @@ -2457,6 +2457,12 @@ static void ksz_update_port_member(struct ksz_device *dev, int port)
>  		dev->dev_ops->cfg_port_member(dev, i, val | cpu_port);
>  	}
>  
> +	/* HSR ports are setup once so need to use the assigned membership
> +	 * when the port is enabled.
> +	 */
> +	if (!port_member && p->stp_state == BR_STATE_FORWARDING &&
> +	    (dev->hsr_ports & BIT(port)))
> +		port_member = dev->hsr_ports;
>  	dev->dev_ops->cfg_port_member(dev, port, port_member | cpu_port);
>  }
>