netdev - Re: Kernel crashes in phy_attach

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Message-ID: <20170208145148.GF10855@lunn.ch>
Date:   Wed, 8 Feb 2017 15:51:48 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Kernel crashes in phy_attach_direct()

> Yes, this is what I am using right now:
> 
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -920,11 +920,6 @@ int phy_attach_direct(struct net_device *dev,
> struct phy_device *phydev,
>                 return -EIO;
>         }
> 
> -       if (!try_module_get(d->driver->owner)) {
> -               dev_err(&dev->dev, "failed to get the device driver module\n");
> -               return -EIO;
> -       }
> -
>         get_device(d);
> 
>         /* Assume that if there is no driver, that it doesn't
> @@ -946,6 +941,11 @@ int phy_attach_direct(struct net_device *dev,
> struct phy_device *phydev,
>                         goto error;
>         }
> 
> +       if (!try_module_get(d->driver->owner)) {
> +               dev_err(&dev->dev, "failed to get the device driver module\n");
> +               return -EIO;
> +       }
> +
>         if (phydev->attached_dev) {
>                 dev_err(&dev->dev, "PHY already attached\n");
>                 err = -EBUSY;
> 
> Would you like me to submit this one?

I'm just wondering about the get_device(d); Does the ordering matter
here? Lets wait for Florian before submitting a patch.

      Andrew