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

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Date: Wed, 20 Dec 2023 23:44:18 +0300
From: Sergey Shtylyov <s.shtylyov@....ru>
To: claudiu beznea <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 12/17/23 5:02 PM, claudiu beznea 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...
> 
> It is also called with rtnl_mutex locked at least though __dev_change_flags().

   I'm tired of chasing the call tree for you. :-)
   Since I'm hoping we'll agree on the ndo_get_stats() case, it would
seem safer to use an is_opened flag here as well, like sh_eth.c does.

[...]

MBR, Sergey