netdev - Re: [PATCH v6 2/3] net: ethernet: renesas: Add support for "Ethernet Switch"

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Message-ID: <Y11rVIKtUDf1i5xP@lunn.ch>
Date:   Sat, 29 Oct 2022 20:05:08 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v6 2/3] net: ethernet: renesas: Add support for "Ethernet
 Switch"

> +	for (i = 0; i < RSWITCH_NUM_PORTS; i++) {
> +		err = register_netdev(priv->rdev[i]->ndev);
> +		if (err) {
> +			for (i--; i >= 0; i--)
> +				unregister_netdev(priv->rdev[i]->ndev);
> +			goto err_register_netdev;
> +		}
> +	}
> +
> +	err = rswitch_ether_port_init_all(priv);
> +	if (err)
> +		goto err_ether_port_init_all;

As soon as you call register_netdev() the devices are active, and can
be in use. E.G. NFS root can start mounting the filesystem before
register_netdev() even returns. Is it safe to call driver operations
before rswitch_ether_port_init_all().

	Andrew