omap: iommu: Gracefully fail iommu_enable if no arch_iommu is registered
In a modular build of the iommu code it's possible that the arch iommu code
isn't loaded when trying to enable the iommu. Instead of blindly following a
null pointer return -NODEV in that case.
Signed-off-by: Martin Hostettler <martin@neutronstar.dyndns.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/plat-omap/iommu.c b/arch/arm/plat-omap/iommu.c
index b1107c0..3d8f55e 100644
--- a/arch/arm/plat-omap/iommu.c
+++ b/arch/arm/plat-omap/iommu.c
@@ -104,6 +104,9 @@
if (!obj)
return -EINVAL;
+ if (!arch_iommu)
+ return -ENODEV;
+
clk_enable(obj->clk);
err = arch_iommu->enable(obj);