linux-kernel - Re: [PATCH] iommu/vt-d: Fix an error handling path in 'intel_prepare_irq

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Date:   Sun, 11 Apr 2021 15:46:44 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        dwmw2@...radead.org, joro@...tes.org, will@...nel.org,
        kyung.min.park@...el.com
Cc:     baolu.lu@...ux.intel.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] iommu/vt-d: Fix an error handling path in
 'intel_prepare_irq_remapping()'

On 4/11/21 3:08 PM, Christophe JAILLET wrote:
> If 'intel_cap_audit()' fails, we should return directly, as already done in
> the surrounding error handling path.
> 
> Fixes: ad3d19029979 ("iommu/vt-d: Audit IOMMU Capabilities and add helper functions")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> This patch is completely speculative.
> It is based on a spurious mix-up of direct return and goto.
> ---
>   drivers/iommu/intel/irq_remapping.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
> index 75429a5373ec..f912fe45bea2 100644
> --- a/drivers/iommu/intel/irq_remapping.c
> +++ b/drivers/iommu/intel/irq_remapping.c
> @@ -736,7 +736,7 @@ static int __init intel_prepare_irq_remapping(void)
>   		return -ENODEV;
>   
>   	if (intel_cap_audit(CAP_AUDIT_STATIC_IRQR, NULL))
> -		goto error;
> +		return -ENODEV;
>   
>   	if (!dmar_ir_support())
>   		return -ENODEV;
> 

Thanks!

Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>

Best regards,
baolu