linux-kernel - [PATCH 2/2] ARM: SMMU: return NULL on error in arm_smmu_iova_to

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Date:	Fri, 11 Oct 2013 15:24:47 +0200
From:	Antonios Motakis <a.motakis@...tualopensystems.com>
To:	Will Deacon <will.deacon@....com>, Joerg Roedel <joro@...tes.org>,
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM SMMU DRIVER),
	iommu@...ts.linux-foundation.org (open list:IOMMU DRIVERS),
	linux-kernel@...r.kernel.org (open list)
Cc:	kvmarm@...ts.cs.columbia.edu, iommu@...ts.linux-foundation.org,
	tech@...tualopensystems.com, agraf@...e.de, B08248@...escale.com,
	Antonios Motakis <a.motakis@...tualopensystems.com>
Subject: [PATCH 2/2] ARM: SMMU: return NULL on error in arm_smmu_iova_to_phys

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@...tualopensystems.com>
---
 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

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