linux-kernel - Re: [PATCH net v2 1/3] net: bcmgenet: synchronize EXT_RGMII_OOB

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Message-ID: <8c28fa31-7d14-48b4-918f-f88935795a34@broadcom.com>
Date: Fri, 26 Apr 2024 11:16:23 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Doug Berger <opendmb@...il.com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Cc: bcm-kernel-feedback-list@...adcom.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH net v2 1/3] net: bcmgenet: synchronize EXT_RGMII_OOB_CTRL
 access

On 4/25/24 15:27, Doug Berger wrote:
> The EXT_RGMII_OOB_CTRL register can be written from different
> contexts. It is predominantly written from the adjust_link
> handler which is synchronized by the phydev->lock, but can
> also be written from a different context when configuring the
> mii in bcmgenet_mii_config().
> 
> The chances of contention are quite low, but it is conceivable
> that adjust_link could occur during resume when WoL is enabled
> so use the phydev->lock synchronizer in bcmgenet_mii_config()
> to be sure.
> 
> Fixes: afe3f907d20f ("net: bcmgenet: power on MII block for all MII modes")
> Cc: stable@...r.kernel.org
> Signed-off-by: Doug Berger <opendmb@...il.com>

Acked-by: Florian Fainelli <florian.fainelli@...adcom.com>
-- 
Florian

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