linux-kernel - Re: [PATCH v2 2/3] wifi: ath12k: Clear affinity hint before calling ath12k_pci_free

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Message-ID: <660b8c20-6ab5-4ce5-b1bb-43e78da96d72@quicinc.com>
Date: Tue, 25 Feb 2025 15:24:31 +0800
From: Baochen Qiang <quic_bqiang@...cinc.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        <jjohnson@...nel.org>
CC: <linux-wireless@...r.kernel.org>, <ath12k@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <ath11k@...ts.infradead.org>
Subject: Re: [PATCH v2 2/3] wifi: ath12k: Clear affinity hint before calling
 ath12k_pci_free_irq() in error path



On 2/25/2025 1:34 PM, Manivannan Sadhasivam wrote:
> If a shared IRQ is used by the driver due to platform limitation, then the
> IRQ affinity hint is set right after the allocation of IRQ vectors in
> ath12k_pci_msi_alloc(). This does no harm unless one of the functions
> requesting the IRQ fails and attempt to free the IRQ.
> 
> This may end up with a warning from the IRQ core that is expecting the
> affinity hint to be cleared before freeing the IRQ:
> 
> kernel/irq/manage.c:
> 
> 	/* make sure affinity_hint is cleaned up */
> 	if (WARN_ON_ONCE(desc->affinity_hint))
> 		desc->affinity_hint = NULL;
> 
> So to fix this issue, clear the IRQ affinity hint before calling
> ath12k_pci_free_irq() in the error path. The affinity will be cleared once
> again further down the error path due to code organization, but that does
> no harm.
> 
> Fixes: a3012f206d07 ("wifi: ath12k: set IRQ affinity to CPU0 in case of one MSI vector")
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  drivers/net/wireless/ath/ath12k/pci.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/wireless/ath/ath12k/pci.c b/drivers/net/wireless/ath/ath12k/pci.c
> index 06cff3849ab8..2851f6944b86 100644
> --- a/drivers/net/wireless/ath/ath12k/pci.c
> +++ b/drivers/net/wireless/ath/ath12k/pci.c
> @@ -1689,6 +1689,8 @@ static int ath12k_pci_probe(struct pci_dev *pdev,
>  	return 0;
>  
>  err_free_irq:
> +	/* __free_irq() expects the caller to have cleared the affinity hint */
> +	ath12k_pci_set_irq_affinity_hint(ab_pci, NULL);
>  	ath12k_pci_free_irq(ab);
>  
>  err_ce_free:

LGTM