netdev - Re: [PATCH net 2/2] net: sh_eth: Fix missing rtnl lock in suspend path

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Message-ID: <20250122171237.GF3436806@ragnatech.se>
Date: Wed, 22 Jan 2025 18:12:37 +0100
From: Niklas Söderlund <niklas.soderlund@...natech.se>
To: Kory Maincent <kory.maincent@...tlin.com>
Cc: Paul Barker <paul.barker.ct@...renesas.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Mikhail Ulyanov <mikhail.ulyanov@...entembedded.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
	netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 2/2] net: sh_eth: Fix missing rtnl lock in suspend
 path

Hi Kory,

Thanks for your work.

On 2025-01-22 17:19:29 +0100, Kory Maincent wrote:
> Fix the suspend path by ensuring the rtnl lock is held where required.
> Calls to sh_eth_close, sh_eth_open and wol operations must be performed
> under the rtnl lock to prevent conflicts with ongoing ndo operations.
> 
> Fixes: b71af04676e9 ("sh_eth: add more PM methods")
> Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>

Tested on R-Car M2,

Tested-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

> ---
>  drivers/net/ethernet/renesas/sh_eth.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
> index 8887b8921009..5fc8027c92c7 100644
> --- a/drivers/net/ethernet/renesas/sh_eth.c
> +++ b/drivers/net/ethernet/renesas/sh_eth.c
> @@ -3494,10 +3494,12 @@ static int sh_eth_suspend(struct device *dev)
>  
>  	netif_device_detach(ndev);
>  
> +	rtnl_lock();
>  	if (mdp->wol_enabled)
>  		ret = sh_eth_wol_setup(ndev);
>  	else
>  		ret = sh_eth_close(ndev);
> +	rtnl_unlock();
>  
>  	return ret;
>  }
> @@ -3511,10 +3513,12 @@ static int sh_eth_resume(struct device *dev)
>  	if (!netif_running(ndev))
>  		return 0;
>  
> +	rtnl_lock();
>  	if (mdp->wol_enabled)
>  		ret = sh_eth_wol_restore(ndev);
>  	else
>  		ret = sh_eth_open(ndev);
> +	rtnl_unlock();
>  
>  	if (ret < 0)
>  		return ret;
> 
> -- 
> 2.34.1
> 

-- 
Kind Regards,
Niklas Söderlund