netdev - RE: [PATCH net] net: stmmac: fix double serdes powerdown

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Message-ID: <BN9PR11MB5370CEFCA9D23A48015AF78CEC23A@BN9PR11MB5370.namprd11.prod.outlook.com>
Date: Fri, 23 Jun 2023 00:05:32 +0000
From: "Chang, Junxiao" <junxiao.chang@...el.com>
To: Andrew Halaney <ahalaney@...hat.com>, 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>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-stm32@...md-mailman.stormreply.com"
	<linux-stm32@...md-mailman.stormreply.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Bartosz Golaszewski
	<bartosz.golaszewski@...aro.org>
Subject: RE: [PATCH net] net: stmmac: fix double serdes powerdown

Acked-by: Junxiao Chang <junxiao.chang@...el.com>

-----Original Message-----
From: Andrew Halaney <ahalaney@...hat.com> 
Sent: Friday, June 23, 2023 2:54 AM
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>; Chang, Junxiao <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

On Wed, Jun 21, 2023 at 03:55:37PM +0200, Bartosz Golaszewski 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: Andrew Halaney <ahalaney@...hat.com>
Tested-by: Andrew Halaney <ahalaney@...hat.com>

> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c 
> b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 10e8a5606ba6..4727f7be4f86 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -7461,12 +7461,6 @@ void stmmac_dvr_remove(struct device *dev)
>  	netif_carrier_off(ndev);
>  	unregister_netdev(ndev);
>  
> -	/* Serdes power down needs to happen after VLAN filter
> -	 * is deleted that is triggered by unregister_netdev().
> -	 */
> -	if (priv->plat->serdes_powerdown)
> -		priv->plat->serdes_powerdown(ndev, priv->plat->bsp_priv);
> -
>  #ifdef CONFIG_DEBUG_FS
>  	stmmac_exit_fs(ndev);
>  #endif
> --
> 2.39.2
>