Re: [PATCH] iommu/amd: Fix panic accessing amd_iommu_enable_faulting

[Vasant Hegde]

On 5/31/2024 12:06 AM, Dimitri Sivanich wrote:
> This fixes a bug introduced by commit d74169ceb0d2 ("iommu/vt-d: Allocate
> DMAR fault interrupts locally").  The panic happens when
> amd_iommu_enable_faulting is called from CPUHP_AP_ONLINE_DYN context.
> 
> Fixes: d74169ceb0d2 ("iommu/vt-d: Allocate DMAR fault interrupts locally")
> Signed-off-by: Dimitri Sivanich <sivanich@xxxxxxx>
> Tested-by: Yi Zhang <yi.zhang@xxxxxxxxxx>

Reviewed-by: Vasant Hegde <vasant.hegde@xxxxxxx>

-Vasant

> ---
>  drivers/iommu/amd/init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
> index a18e74878f68..b02b959d12af 100644
> --- a/drivers/iommu/amd/init.c
> +++ b/drivers/iommu/amd/init.c
> @@ -3353,7 +3353,7 @@ int amd_iommu_reenable(int mode)
>  	return 0;
>  }
>  
> -int __init amd_iommu_enable_faulting(unsigned int cpu)
> +int amd_iommu_enable_faulting(unsigned int cpu)
>  {
>  	/* We enable MSI later when PCI is initialized */
>  	return 0;