iommu: arm-smmu: Handle return of iommu_device_register.

iommu_device_register returns an error code and, although it currently
never fails, we should check its return value anyway.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
[will: adjusted to follow arm-smmu.c]
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 0fd09745822f..029fe0cffee7 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2744,6 +2744,10 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
         iommu_device_set_fwnode(&smmu->iommu, dev->fwnode);
 
         ret = iommu_device_register(&smmu->iommu);
+        if (ret) {
+                dev_err(dev, "Failed to register iommu\n");
+                return ret;
+        }
 
 #ifdef CONFIG_PCI
         if (pci_bus_type.iommu_ops != &arm_smmu_ops) {