From: Marek Szyprowski <m.szyprowski@samsung.com>
Date: Tue, 19 May 2015 13:20:32 +0000 (+0200)
Subject: iommu/exynos: Add/remove callbacks should fail if no iommu is available
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=06801db0d3bba2b4e585130981fadf71bbce4159;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

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 f6ed59cad90b..99ed39c89e0b 100644
--- 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);
 }