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authorThierry Reding <treding@nvidia.com>2015-02-06 13:44:07 +0300
committerJoerg Roedel <jroedel@suse.de>2015-02-25 15:42:25 +0300
commit425061b0f5074c727446b6383d0880f089ede469 (patch)
tree019835e6bbdc5c7eb52d5c4d09d6b1ea484e3a63 /drivers/iommu
parentf938aab2c46c906b41261629982e2a2cda9e819f (diff)
downloadlinux-425061b0f5074c727446b6383d0880f089ede469.tar.xz
iommu/rockchip: Play nice in multi-platform builds
The Rockchip IOMMU driver unconditionally executes code and registers a struct iommu_ops with the platform bus irrespective of whether it runs on a Rockchip 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 Rockchip IOMMU 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 Rockchip IOMMU. Reported-by: Nicolas Chauvet <kwizart@gmail.com> Cc: Heiko Stuebner <heiko@sntech.de> Cc: Daniel Kurtz <djkurtz@chromium.org> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/rockchip-iommu.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index 6a8b1ec4a48a..9f74fddcd304 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -1015,8 +1015,15 @@ static struct platform_driver rk_iommu_driver = {
static int __init rk_iommu_init(void)
{
+ struct device_node *np;
int ret;
+ np = of_find_matching_node(NULL, rk_iommu_dt_ids);
+ if (!np)
+ return 0;
+
+ of_node_put(np);
+
ret = bus_set_iommu(&platform_bus_type, &rk_iommu_ops);
if (ret)
return ret;