[PATCH 14/17] iommu/vt-d: Remove BUG_ON when domain->pgd is NULL

Lu Baolu
2023-04-11T06:51:04Z

From: Tina Zhang <tina.zhang@intel.com>

When performing domain_context_mapping or getting dma_pte of a pfn, the
availability of the domain page table directory is ensured. Therefore,
the domain->pgd checkings are unnecessary.

Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Link: https://lore.kernel.org/r/20230406065944.2773296-5-tina.zhang@intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel/iommu.c | 4 ----
1 file changed, 4 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index dd61bb554aa7..f11347a590d7 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -915,8 +915,6 @@ static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
int level = agaw_to_level(domain->agaw);
int offset;

- BUG_ON(!domain->pgd);
-
if (!domain_pfn_supported(domain, pfn))
/* Address beyond IOMMU's addressing capabilities. */
return NULL;
@@ -1910,8 +1908,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
pr_debug("Set context mapping for %02x:%02x.%d\n",
bus, PCI_SLOT(devfn), PCI_FUNC(devfn));

- BUG_ON(!domain->pgd);
-
spin_lock(&iommu->lock);
ret = -ENOMEM;
context = iommu_context_addr(iommu, bus, devfn, 1);
--
2.34.1