linux-kernel - Re: [PATCH net-next v2 19/21] net: ravb: Do not set promiscuous mode if the interface is down

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Message-ID: <69a80458-b607-2cee-e8b1-38eb8d56eca3@omp.ru>
Date: Sat, 16 Dec 2023 23:16:32 +0300
From: Sergey Shtylyov <s.shtylyov@....ru>
To: Claudiu <claudiu.beznea@...on.dev>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<richardcochran@...il.com>, <p.zabel@...gutronix.de>,
	<yoshihiro.shimoda.uh@...esas.com>, <wsa+renesas@...g-engineering.com>,
	<geert+renesas@...der.be>
CC: <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Claudiu Beznea
	<claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH net-next v2 19/21] net: ravb: Do not set promiscuous mode
 if the interface is down

On 12/14/23 2:45 PM, Claudiu wrote:

> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> Do not allow setting promiscuous mode if the interface is down. In case
> runtime PM is enabled, and while interface is down, the IP will be in reset
> mode (as for some platforms disabling/enabling the clocks will switch the
> IP to standby mode which will lead to losing registers' content).

   Register.
   Have this issue actually occurred for you?

> Commit prepares for the addition of runtime PM.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
[...]

> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 1995cf7ff084..633346b6cd7c 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -2164,6 +2164,9 @@ static void ravb_set_rx_mode(struct net_device *ndev)
>  	struct ravb_private *priv = netdev_priv(ndev);
>  	unsigned long flags;
>  
> +	if (!netif_running(ndev))

   Seems racy as well...

> +		return;

   Hm, sh_eth.c doesn't have such check -- perhaps should be fixed
as well...

[...]

MBR, Sergey