[PATCH 3/4] iommu/vt-d: Remove two WARN_ON in domain_context_mapping_one()

Lu Baolu
2023-06-14T02:49:14Z

From: Yanfei Xu <yanfei.xu@intel.com>

Remove the WARN_ON(did == 0) as the domain id 0 is reserved and
set once the domain_ids is allocated. So iommu_init_domains will
never return 0.

Remove the WARN_ON(!table) as this pointer will be accessed in
the following code, if empty "table" really happens, the kernel
will report a NULL pointer reference warning at the first place.

Signed-off-by: Yanfei Xu <yanfei.xu@intel.com>
Link: https://lore.kernel.org/r/20230605112659.308981-3-yanfei.xu@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 e83fe243680b..4c0b7424c45e 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -1897,8 +1897,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
struct context_entry *context;
int ret;

- WARN_ON(did == 0);
-
if (hw_pass_through && domain_type_is_si(domain))
translation = CONTEXT_TT_PASS_THROUGH;

@@ -1944,8 +1942,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
if (sm_supported(iommu)) {
unsigned long pds;

- WARN_ON(!table);
-
/* Setup the PASID DIR pointer: */
pds = context_get_sm_pds(table);
context->lo = (u64)virt_to_phys(table->table) |
--
2.34.1