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.

Signed-off-by: Dimitri Sivanich <sivanich@hpe.com>
Tested-by: Yi Zhang <yi.zhang@redhat.com>
---
 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;
-- 
2.35.3

Hi Dimitri,


On 5/30/2024 6:27 PM, 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.

Issue is happening on AMD system. Can you please change subject line. s/vt-d/amd/ ?

Also may be add "Fixes" tag as well.

-Vasant


> 
> Signed-off-by: Dimitri Sivanich <sivanich@hpe.com>
> Tested-by: Yi Zhang <yi.zhang@redhat.com>
> ---
>  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;