[PATCH v9 16/16] iommu/exynos: return 0 if iommu_attach_device() successes

iommu_attach_device() against exynos-iommu positive integer on success if the caller calls iommu_attach_device() with the same iommu_domain multiple times without call to iommu_detach_device() to inform the caller how many calls to iommu_detach_device() to really detach iommu. However the

[PATCH v9 16/16] iommu/exynos: return 0 if iommu_attach_device() successes

iommu_attach_device() against exynos-iommu positive integer on success if the caller calls iommu_attach_device() with the same iommu_domain multiple times without call to iommu_detach_device() to inform the caller how many calls to iommu_detach_device() to really detach iommu. However the