netdev - Re: [Regression] FEC: Panic on suspend in 3.16

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Message-ID: <20140806154711.GQ30282@n2100.arm.linux.org.uk>
Date:	Wed, 6 Aug 2014 16:47:11 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Stefano Babic <sbabic@...x.de>
Cc:	Nathan Lynch <Nathan_Lynch@...tor.com>,
	Martin Fuzzey <mfuzzey@...keon.com>, netdev@...r.kernel.org,
	festevam@...il.com,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Regression] FEC: Panic on suspend in 3.16

On Wed, Aug 06, 2014 at 05:32:41PM +0200, Stefano Babic wrote:
> Hi Nathan, Martin,
> 
> On 06/08/2014 17:09, Nathan Lynch wrote:
> > On 08/06/2014 09:52 AM, Martin Fuzzey wrote:
> >> Hi all,
> >>
> >> I am using the fec ethernet driver on a i.MX53 SoC.
> >>
> >> All was working fine on 3.13 but, after upgrading to 3.16 I now get a
> >> panic on suspend:
> > 
> > Same issue reported here:
> > 
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2014-August/277728.html
> > 
> > a71e3c37960c (net: phy: Set the driver when registering an MDIO bus
> > device) has been implicated; try reverting that.
> > 
> 
> I confirm this issue (on a i.MX35). The ndev pointer is NULL in the
> suspend function. I added the check for the pointer:

As Nathan says, the problem is caused by a71e3c37960c and the fix which
will soon be merged into mainline and stable trees will be a revert of
that commit.

Thanks.

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