From: Thierry Reding Date: Fri, 6 Feb 2015 10:44:05 +0000 (+0100) Subject: iommu/exynos: Play nice in multi-platform builds X-Git-Tag: omap-for-v4.1/wl12xx-dt~30^2~4 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a7b67cd5d9afb94fdcacb71b43066b8d70d1d218;p=pandora-kernel.git 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 Cc: Kukjin Kim Signed-off-by: Thierry Reding Signed-off-by: Joerg Roedel --- Reading git-diff-tree failed