This patch prepares Exynos IOMMU driver for deferred probing
support. Once it gets added, of_xlate() callback might be called
more than once for the same SYSMMU controller and master device
(for example it happens when masters device driver fails with
EPROBE_DEFER). This patch adds a check, which ensures that SYSMMU
controller is added to its master device (owner) only once.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/iommu/exynos-iommu.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index e7851cffbbee..426b1534d4d3 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1247,7 +1247,7 @@ static int exynos_iommu_of_xlate(struct device *dev,
{
struct exynos_iommu_owner *owner = dev->archdata.iommu;
struct platform_device *sysmmu = of_find_device_by_node(spec->np);
- struct sysmmu_drvdata *data;
+ struct sysmmu_drvdata *data, *entry;
if (!sysmmu)
return -ENODEV;
@@ -1266,6 +1266,10 @@ static int exynos_iommu_of_xlate(struct device *dev,
dev->archdata.iommu = owner;
}
+ list_for_each_entry(entry, &owner->controllers, owner_node)
+ if (entry == data)
+ return 0;
+
list_add_tail(&data->owner_node, &owner->controllers);
data->master = dev;
--
1.9.1
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