iommu/exynos: Add/remove callbacks should fail if no iommu is available

Return fail if given master device passed to add_device/remove_device
callbacks doesn't has associated any sysmmu controller.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index f6ed59c..99ed39c 100644 (file)
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1082,6 +1082,9 @@ static int exynos_iommu_add_device(struct device *dev)
        struct iommu_group *group;
        int ret;
 
+       if (!has_sysmmu(dev))
+               return -ENODEV;
+
        group = iommu_group_get(dev);
 
        if (!group) {
@@ -1100,6 +1103,9 @@ static int exynos_iommu_add_device(struct device *dev)
 
 static void exynos_iommu_remove_device(struct device *dev)
 {
+       if (!has_sysmmu(dev))
+               return;
+
        iommu_group_remove_device(dev);
 }