netdev - Re: [PATCH net] net: stmmac: remove disable_irq() from ->ndo_poll

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230811182025.7473bf63@kernel.org>
Date: Fri, 11 Aug 2023 18:20:25 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Remi Pommarel <repk@...plefau.lt>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu
 <joabreu@...opsys.com>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Sabrina
 Dubroca <sd@...asysnail.net>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH net] net: stmmac: remove disable_irq() from
 ->ndo_poll_controller()

On Thu, 10 Aug 2023 10:37:16 +0200 Remi Pommarel wrote:
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 4727f7be4f86..bbe509abc5dc 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -5958,8 +5958,8 @@ static void stmmac_poll_controller(struct net_device *dev)
>  		for (i = 0; i < priv->plat->tx_queues_to_use; i++)
>  			stmmac_msi_intr_tx(0, &priv->dma_conf.tx_queue[i]);
>  	} else {
> -		disable_irq(dev->irq);
> -		stmmac_interrupt(dev->irq, dev);
> +		if (disable_hardirq(dev->irq))
> +			stmmac_interrupt(dev->irq, dev);
>  		enable_irq(dev->irq);

Implementing .ndo_poll_controller is only needed if driver doesn't use
NAPI. This driver seems to use NAPI on all paths, AFAICT you can simply
delete this function completely.
-- 
pw-bot: cr