netdev - Re: [PATCH net, 1/2] net: mana: Fix hint value before free irq

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Message-ID: <Y9Y8FSlYNyNDf6AD@unreal>
Date:   Sun, 29 Jan 2023 11:27:49 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Haiyang Zhang <haiyangz@...rosoft.com>
Cc:     linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
        decui@...rosoft.com, kys@...rosoft.com, paulros@...rosoft.com,
        olaf@...fle.de, vkuznets@...hat.com, davem@...emloft.net,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH net, 1/2] net: mana: Fix hint value before free irq

On Thu, Jan 26, 2023 at 01:04:44PM -0800, Haiyang Zhang wrote:
> Need to clear affinity_hint before free_irq(), otherwise there is a
> one-time warning and stack trace during module unloading.

Please add this warning and stack trace to the commit message.

Thanks

> 
> To fix this bug, set affinity_hint to NULL before free as required.
> 
> Cc: stable@...r.kernel.org
> Fixes: 71fa6887eeca ("net: mana: Assign interrupts to CPUs based on NUMA nodes")
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> ---
>  drivers/net/ethernet/microsoft/mana/gdma_main.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> index b144f2237748..3bae9d4c1f08 100644
> --- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
> +++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> @@ -1297,6 +1297,8 @@ static int mana_gd_setup_irqs(struct pci_dev *pdev)
>  	for (j = i - 1; j >= 0; j--) {
>  		irq = pci_irq_vector(pdev, j);
>  		gic = &gc->irq_contexts[j];
> +
> +		irq_update_affinity_hint(irq, NULL);
>  		free_irq(irq, gic);
>  	}
>  
> @@ -1324,6 +1326,9 @@ static void mana_gd_remove_irqs(struct pci_dev *pdev)
>  			continue;
>  
>  		gic = &gc->irq_contexts[i];
> +
> +		/* Need to clear the hint before free_irq */
> +		irq_update_affinity_hint(irq, NULL);
>  		free_irq(irq, gic);
>  	}
>  
> -- 
> 2.25.1
>