Re: [PATCH net-next 4/6] net: gianfar: use devm for register_netdev

[Maxime Chevallier <maxime.chevallier@bootlin.com>]

Hi,

On Tue,  1 Oct 2024 14:22:02 -0700
Rosen Penev <rosenp@gmail.com> wrote:

> Avoids manual unregister netdev.
> 
> Signed-off-by: Rosen Penev <rosenp@gmail.com>
> ---
>  drivers/net/ethernet/freescale/gianfar.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
> index 66818d63cced..07936dccc389 100644
> --- a/drivers/net/ethernet/freescale/gianfar.c
> +++ b/drivers/net/ethernet/freescale/gianfar.c
> @@ -3272,7 +3272,7 @@ static int gfar_probe(struct platform_device *ofdev)
>  	/* Carrier starts down, phylib will bring it up */
>  	netif_carrier_off(dev);
>  
> -	err = register_netdev(dev);
> +	err = devm_register_netdev(&ofdev->dev, dev);

I wonder if this is not a good opportunity to also move the
registration at the end of this function. Here, the netdev is
registered but some configuration is still being done afterwards, such
as WoL init and internal filter configuration.

There's the ever so slightly chance that traffic can start flowing
before these filters are configured, which could lead to unexpected
side effects. We usually register the netdev as a very last step, once
all initial configuration is done and the device is ready to be used.

As you're doing some cleanup on the registration code itself, it seems
like a good opportunity to change that.

Thanks,

Maxime