Exynos DRM on ARM architecture creates its own DMA-IOMMU mapping, shared
between all devices that builds the Exynos DRM subsystem. Thus, the
default DMA-IOMMU mapping structure created by platform init code can be
released to avoid leaking resources, because after exynos_iommu_attach()
the default mapping is no longer accessible.
Reported-by: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx>
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_drm_iommu.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.h b/drivers/gpu/drm/exynos/exynos_drm_iommu.h
index 87f6b5672e11..7a4528461bba 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_iommu.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.h
@@ -37,8 +37,13 @@ static inline int __exynos_iommu_create_mapping(struct exynos_drm_private *priv,
static inline int __exynos_iommu_attach(struct exynos_drm_private *priv,
struct device *dev)
{
- if (dev->archdata.mapping)
+ struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
+
+ /* release device from the default DMA-IOMMU mapping */
+ if (mapping) {
arm_iommu_detach_device(dev);
+ arm_iommu_release_mapping(mapping);
+ }
return arm_iommu_attach_device(dev, priv->mapping);
}
--
1.9.1
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