linux-kernel - Re: [PATCH net-next 3/3] epic100: allow nesting of ethtool

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Date:   Sun, 5 Jan 2020 23:08:32 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Maya Erez <merez@...eaurora.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org, wil6210@....qualcomm.com,
        Francois Romieu <romieu@...zoreil.com>,
        linux-kernel@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net-next 3/3] epic100: allow nesting of ethtool_ops
 begin() and complete()

> @@ -1435,8 +1436,10 @@ static int ethtool_begin(struct net_device *dev)
>  	struct epic_private *ep = netdev_priv(dev);
>  	void __iomem *ioaddr = ep->ioaddr;
>  
> +	if (ep->ethtool_ops_nesting == U32_MAX)
> +		return -EBUSY;
>  	/* power-up, if interface is down */
> -	if (!netif_running(dev)) {
> +	if (ep->ethtool_ops_nesting++ && !netif_running(dev)) {
>  		ew32(GENCTL, 0x0200);
>  		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
>  	}

Hi Michal

In the via-velocity you added:

+       if (vptr->ethtool_ops_nesting == U32_MAX)
+               return -EBUSY;
+       if (!vptr->ethtool_ops_nesting++ && !netif_running(dev))
                velocity_set_power_state(vptr, PCI_D0);
        return 0;

These two fragments differ by a ! . Is that correct?

      Andrew