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

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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.
-- 
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