linux-kernel - Re: [PATCH stable 4.14] net: phy: broadcom: stub c45 read/write for 54810

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Message-ID: <2023082252-motor-grower-5621@gregkh>
Date:   Tue, 22 Aug 2023 09:10:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Florian Fainelli <florian.fainelli@...adcom.com>
Cc:     stable@...r.kernel.org, Justin Chen <justin.chen@...adcom.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        "open list:BROADCOM ETHERNET PHY DRIVERS" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH stable 4.14] net: phy: broadcom: stub c45 read/write for
 54810

On Mon, Aug 21, 2023 at 02:54:10PM -0700, Florian Fainelli wrote:
> From: Justin Chen <justin.chen@...adcom.com>
> 
> commit 096516d092d54604d590827d05b1022c8f326639 upstream
> 
> The 54810 does not support c45. The mmd_phy_indirect accesses return
> arbirtary values leading to odd behavior like saying it supports EEE
> when it doesn't. We also see that reading/writing these non-existent
> MMD registers leads to phy instability in some cases.
> 
> Fixes: b14995ac2527 ("net: phy: broadcom: Add BCM54810 PHY entry")
> Signed-off-by: Justin Chen <justin.chen@...adcom.com>
> Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
> Link: https://lore.kernel.org/r/1691901708-28650-1-git-send-email-justin.chen@broadcom.com
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> [florian: resolved conflicts in 4.14]
> Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>

Thanks for these, all now queued up.

greg k-h