iommu/exynos: Properly release device from the default domain in ->remove

mszyprow · joergroedel · commit fff2fd1a9e4b · 2017-01-10T15:01:21.000+01:00
IOMMU core doesn't detach device from the default domain before calling
-&gt;iommu_remove_device, so check that and do the proper cleanup or
warn if device is still attached to non-default domain.

Signed-off-by: Marek Szyprowski &lt;m.szyprowski@samsung.com&gt;
Signed-off-by: Joerg Roedel &lt;jroedel@suse.de&gt;
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
@@ -1242,9 +1242,21 @@ static int exynos_iommu_add_device(struct device *dev)
 
 static void exynos_iommu_remove_device(struct device *dev)
 {
+	struct exynos_iommu_owner *owner = dev->archdata.iommu;
+
 	if (!has_sysmmu(dev))
 		return;
 
+	if (owner->domain) {
+		struct iommu_group *group = iommu_group_get(dev);
+
+		if (group) {
+			WARN_ON(owner->domain !=
+				iommu_group_default_domain(group));
+			exynos_iommu_detach_device(owner->domain, dev);
+			iommu_group_put(group);
+		}
+	}
 	iommu_group_remove_device(dev);
 }
 
