linux-kernel - Re: [PATCH net] net: stmmac: fix double serdes powerdown

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Message-ID: <ZJQCnny4pLY3qpYQ@nanopsycho>
Date:   Thu, 22 Jun 2023 10:13:18 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Junxiao Chang <junxiao.chang@...el.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH net] net: stmmac: fix double serdes powerdown

Wed, Jun 21, 2023 at 03:55:37PM CEST, brgl@...ev.pl wrote:
>From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>
>Commit 49725ffc15fc ("net: stmmac: power up/down serdes in
>stmmac_open/release") correctly added a call to the serdes_powerdown()
>callback to stmmac_release() but did not remove the one from
>stmmac_remove() which leads to a doubled call to serdes_powerdown().
>
>This can lead to all kinds of problems: in the case of the qcom ethqos
>driver, it caused an unbalanced regulator disable splat.
>
>Fixes: 49725ffc15fc ("net: stmmac: power up/down serdes in stmmac_open/release")
>Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Reviewed-by: Jiri Pirko <jiri@...dia.com>