linux-kernel - [PATCH] iommu/vt-d: Fix panic accessing amd_iommu_enable

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Date: Thu, 30 May 2024 07:57:03 -0500
From: Dimitri Sivanich <sivanich@....com>
To: Yi Zhang <yi.zhang@...hat.com>, "Tian, Kevin" <kevin.tian@...el.com>,
        Vasant Hegde <vasant.hegde@....com>,
        Baolu Lu <baolu.lu@...ux.intel.com>, Joerg Roedel <joro@...tes.org>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        David Wang <00107082@....com>,
        Shinichiro Kawasaki <shinichiro.kawasaki@....com>,
        Dimitri Sivanich <sivanich@....com>, iommu@...ts.linux.dev
Cc: linux-kernel@...r.kernel.org, Steve Wahl <steve.wahl@....com>,
        Russ Anderson <russ.anderson@....com>
Subject: [PATCH] iommu/vt-d: Fix panic accessing amd_iommu_enable_faulting

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@....com>
Tested-by: Yi Zhang <yi.zhang@...hat.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