[PATCH 2/2] ARM: SMMU: return NULL on error in arm_smmu_iova_to_phys

[Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>]

The return value of arm_smmu_iova_to_phys is directly passed to the
user of the IOMMU API via iommu_iova_to_phys; however the ARM SMMU
driver returns -EINVAL on error, which is not consistent with the
rest of the drivers implementing the IOMMU API. VFIO also relies on
the call returning NULL when a page has not been mapped already.

Signed-off-by: Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
---
 drivers/iommu/arm-smmu.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 8b71332..fe81b20 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1480,10 +1480,7 @@ static phys_addr_t arm_smmu_iova_to_phys(struct iommu_domain *domain,
 
 err_unlock:
 	spin_unlock(&smmu_domain->lock);
-	dev_warn(smmu->dev,
-		 "invalid (corrupt?) page tables detected for iova 0x%llx\n",
-		 (unsigned long long)iova);
-	return -EINVAL;
+	return NULL;
 }
 
 static int arm_smmu_domain_has_cap(struct iommu_domain *domain,
-- 
1.8.1.2