netdev - Re: [PATCH net 1/2] amd-xgbe: Use __napi

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Date:   Mon, 2 Dec 2019 11:19:00 -0600
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH net 1/2] amd-xgbe: Use __napi_schedule() in BH context

On 11/26/19 4:20 PM, Sebastian Andrzej Siewior wrote:
> The driver uses __napi_schedule_irqoff() which is fine as long as it is
> invoked with disabled interrupts by everybody. Since the commit
> mentioned below the driver may invoke xgbe_isr_task() in tasklet/softirq
> context. This may lead to list corruption if another driver uses
> __napi_schedule_irqoff() in IRQ context.
> 
> Use __napi_schedule() which safe to use from IRQ and softirq context.
> 
> Fixes: 85b85c853401d ("amd-xgbe: Re-issue interrupt if interrupt status not cleared")
> Cc: Tom Lendacky <thomas.lendacky@....com>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Acked-by: Tom Lendacky <thomas.lendacky@....com>

> ---
>  drivers/net/ethernet/amd/xgbe/xgbe-drv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
> index 98f8f20331544..3bd20f7651207 100644
> --- a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
> +++ b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
> @@ -514,7 +514,7 @@ static void xgbe_isr_task(unsigned long data)
>  				xgbe_disable_rx_tx_ints(pdata);
>  
>  				/* Turn on polling */
> -				__napi_schedule_irqoff(&pdata->napi);
> +				__napi_schedule(&pdata->napi);
>  			}
>  		} else {
>  			/* Don't clear Rx/Tx status if doing per channel DMA
>