netdev - Re: [PATCH 3/4] net: dsa: mv88e6xxx: Handle error in serdes_get

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Message-ID: <20201023223934.GD745568@lunn.ch>
Date:   Sat, 24 Oct 2020 00:39:34 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     vivien.didelot@...il.com, f.fainelli@...il.com, olteanv@...il.com,
        davem@...emloft.net, kuba@...nel.org, linux@...linux.org.uk,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] net: dsa: mv88e6xxx: Handle error in serdes_get_regs

On Thu, Oct 22, 2020 at 02:25:14PM +1300, Chris Packham wrote:
> If the underlying read operation failed we would end up writing stale
> data to the supplied buffer. This would end up with the last
> successfully read value repeating. Fix this by only writing the data
> when we know the read was good. This will mean that failed values will
> return 0xffff.
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew