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authorThierry Reding <treding@nvidia.com>2015-02-06 11:44:06 +0100
committerJoerg Roedel <jroedel@suse.de>2015-02-25 13:41:33 +0100
commitf938aab2c46c906b41261629982e2a2cda9e819f (patch)
tree236d80149511d8412c32b97465f6094564a8bb3e /drivers/iommu
parenta7b67cd5d9afb94fdcacb71b43066b8d70d1d218 (diff)
iommu/omap: Play nice in multi-platform builds
The OMAP IOMMU driver unconditionally executes code and registers a struct iommu_ops with the platform bus irrespective of whether it runs on an OMAP 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 OMAP 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 OMAP IOMMU. Reported-by: Nicolas Chauvet <kwizart@gmail.com> Cc: Tony Lindgren <tony@atomide.com> Cc: Suman Anna <s-anna@ti.com> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/omap-iommu.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index f59f857b702e..a4ba851825c2 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -1376,6 +1376,13 @@ static int __init omap_iommu_init(void)
struct kmem_cache *p;
const unsigned long flags = SLAB_HWCACHE_ALIGN;
size_t align = 1 << 10; /* L2 pagetable alignement */
+ struct device_node *np;
+
+ np = of_find_matching_node(NULL, omap_iommu_of_match);
+ if (!np)
+ return 0;
+
+ of_node_put(np);
p = kmem_cache_create("iopte_cache", IOPTE_TABLE_SIZE, align, flags,
iopte_cachep_ctor);