[PATCH AUTOSEL 5.12 036/116] iommu/arm-smmu-v3: Add a check to avoid invalid iotlb sync

[Sasha Levin]

From: Xiang Chen <chenxiang66@xxxxxxxxxxxxx>

[ Upstream commit 6cc7e5a9c6b02507b9be5a99b51e970afa91c85f ]

It may send a invalid tlb sync for smmuv3 if iotlb_gather is not valid
(iotlb_gather->pgsize = 0). So add a check to avoid invalid iotlb sync
for it.

Signed-off-by: Xiang Chen <chenxiang66@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1617109106-121844-1-git-send-email-chenxiang66@xxxxxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 8594b4a83043..941ba5484731 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2305,6 +2305,9 @@ static void arm_smmu_iotlb_sync(struct iommu_domain *domain,
 {
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 
+	if (!gather->pgsize)
+		return;
+
 	arm_smmu_tlb_inv_range_domain(gather->start,
 				      gather->end - gather->start + 1,
 				      gather->pgsize, true, smmu_domain);
-- 
2.30.2