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authorThierry Reding <treding@nvidia.com>2015-02-06 11:44:05 +0100
committerJoerg Roedel <jroedel@suse.de>2015-02-25 13:40:52 +0100
commita7b67cd5d9afb94fdcacb71b43066b8d70d1d218 (patch)
tree74f1a6d6dbeee860f6ac299125fb771e3225cf8e /include
parentiommu/io-pgtable-arm: Fix self-test WARNs on i386 (diff)
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iommu/exynos: Play nice in multi-platform builds
The Exynos System MMU driver unconditionally executes code and registers a struct iommu_ops with the platform bus irrespective of whether it runs on an Exynos SoC or not. This causes problems in multi-platform kernels where drivers for other SoCs will no longer be able to register their own struct iommu_ops or even try to use a struct iommu_ops for an IOMMU that obviously isn't there. The smallest fix I could think of is to check for the existence of any Exynos System MMU devices in the device tree and skip initialization otherwise. This fixes a problem on Tegra20 where the DRM driver will try to use the obviously non-existent Exynos System MMU. Reported-by: Nicolas Chauvet <kwizart@gmail.com> Cc: Kukjin Kim <kgene@kernel.org> Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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