linux-kernel - Re: [PATCH net-next v6 2/2] net: ethernet: socionext: add AVE ethernet driver

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Date:   Mon, 18 Dec 2017 12:51:06 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     David Miller <davem@...emloft.net>
Cc:     <netdev@...r.kernel.org>, <andrew@...n.ch>, <f.fainelli@...il.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <yamada.masahiro@...ionext.com>, <masami.hiramatsu@...aro.org>,
        <jaswinder.singh@...aro.org>
Subject: Re: [PATCH net-next v6 2/2] net: ethernet: socionext: add AVE ethernet driver

Hello David,

On Fri, 15 Dec 2017 12:57:49 -0500 David Miller <davem@...emloft.net> wrote:

> From: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> Date: Thu, 14 Dec 2017 19:05:10 +0900
> 
> > +static void ave_desc_write(struct net_device *ndev, enum desc_id id,
> > +			   int entry, int offset, u32 val)
> > +{
> > +	struct ave_private *priv = netdev_priv(ndev);
> > +	u32 addr = (id == AVE_DESCID_TX) ? priv->tx.daddr : priv->rx.daddr;
> 
> Please always order local variables from longest to shortest line.
> 
> Audit your entire submission for this issue, thank you.

I see. I'll fix the order of local variables.

> > +	ret = register_netdev(ndev);
> > +	if (ret) {
> > +		dev_err(dev, "failed to register netdevice\n");
> > +		goto out_del_napi;
> > +	}
> > +
> > +	platform_set_drvdata(pdev, ndev);
> 
> You must make all software state settings before reigster_netdev() is
> invoked.
> 
> At the exact moment you call register_netdev(), your device can be
> brought up, interrupts processed, PHY state changes made, etc.
> 
> So you must put this platform_set_drvdata() before the
> register_netdev() call.
> 
> Generally speaking, register_netdev() must always be the last state
> modification done by your probe routine.

Indeed. It's not good to invoke register_netdev() with all software
initialization not completed. I'll move register_netdev() after
all initialization.

Thank you,

---
Best Regards,
Kunihiko Hayashi