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[v2,4/4] iommu/exynos: Properly release device from the default domain in ->remove

Message ID 1483963436-29803-5-git-send-email-m.szyprowski@samsung.com (mailing list archive)
State Not Applicable
Headers show

Commit Message

Marek Szyprowski Jan. 9, 2017, 12:03 p.m. UTC 
IOMMU core doesn't detach device from the default domain before calling
->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 <m.szyprowski@samsung.com>
---
 drivers/iommu/exynos-iommu.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 8bf5a06a6c01..37d9738bd023 100644
--- 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);
 }