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authorMarek Szyprowski <m.szyprowski@samsung.com>2017-01-09 15:03:55 +0300
committerJoerg Roedel <jroedel@suse.de>2017-01-10 17:01:21 +0300
commit0bd5a0c77ad49ce5cf631bbe5616b6625ff50d96 (patch)
treee026f987eecd1a1ecc3c2c16687fc76d4840d981 /drivers/iommu/exynos-iommu.c
parent0d6d3da46ac5949ab5d373fdecf4b4e85a04731c (diff)
downloadlinux-0bd5a0c77ad49ce5cf631bbe5616b6625ff50d96.tar.xz
iommu/exynos: Ensure that SYSMMU is added only once to its master device
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@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/exynos-iommu.c')
-rw-r--r--drivers/iommu/exynos-iommu.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index dda4e5907979..91f78272167c 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1253,7 +1253,7 @@ 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;
@@ -1272,6 +1272,10 @@ 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;