netdev - Re: [PATCH net] net: phy: guard against accessing a NULL features bitmap

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Message-ID: <20190111133730.GA1895@lunn.ch>
Date:   Fri, 11 Jan 2019 14:37:30 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Camelia Groza <camelia.groza@....com>
Cc:     f.fainelli@...il.com, hkallweit1@...il.com, davem@...emloft.net,
        oss@...error.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: phy: guard against accessing a NULL features
 bitmap

On Fri, Jan 11, 2019 at 01:56:46PM +0200, Camelia Groza wrote:
> Since phy driver features became a link_mode bitmap, phy drivers that
> don't have a list of features configured will cause the kernel to crash
> when probed.

Hi Camelia

A NULL features is a driver bug. So i would prefer to solve this
differently.

Please make phy_driver_register() do a WARN_ON(!new_driver->features)
and return -EINVAL.

Do you know of a specific driver which as a NULL value? We should fix
that as well.

Thank
	Andrew