linux-kernel - Re: [PATCH net v2 1/4] net: mvpp2: fix the mac address used when using PPv2.2

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Date:   Fri, 25 Aug 2017 16:29:28 +0200
From:   Antoine Tenart <antoine.tenart@...e-electrons.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Antoine Tenart <antoine.tenart@...e-electrons.com>,
        davem@...emloft.net, thomas.petazzoni@...e-electrons.com,
        gregory.clement@...e-electrons.com, nadavh@...vell.com,
        linux@...linux.org.uk, linux-kernel@...r.kernel.org,
        mw@...ihalf.com, stefanc@...vell.com, netdev@...r.kernel.org
Subject: Re: [PATCH net v2 1/4] net: mvpp2: fix the mac address used when
 using PPv2.2

Hi Andrew,

On Fri, Aug 25, 2017 at 04:19:39PM +0200, Andrew Lunn wrote:
> On Fri, Aug 25, 2017 at 04:14:17PM +0200, Antoine Tenart wrote:
> > The mac address is only retrieved from h/w when using PPv2.1. Otherwise
> > the variable holding it is still checked and used if it contains a valid
> > value. As the variable isn't initialized to an invalid mac address
> > value, we end up with random mac addresses which can be the same for all
> > the ports handled by this PPv2 driver.
> > 
> > Fixes this by initializing the h/w mac address variable to {0}, which is
> > an invalid mac address value. This way the random assignation fallback
> > is called and all ports end up with their own addresses.
> > 
> > Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
> > Fixes: 2697582144dd ("net: mvpp2: handle misc PPv2.1/PPv2.2 differences")
> 
> Is this patch alone sufficient to fix the problem?

Yes it is.

> Ideally, you want a minimal patch for stable, i.e. -net, and a fuller
> fix can go into net-next.

That was my intention (providing a minimal patch for stable), and I
asked about this approach in the v1. Dave told me to resend the series
to net. Maybe my questions weren't clear enough.

So probably the best way to handle this would have been to send 1/4 to
net and 2-4/4 to net-next (but then there's a dependency between the two
series).

Let's wait for Dave's answer, I'll respin if needed so that it's easy
for him to apply it.

Thanks!
Antoine

-- 
Antoine Ténart, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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