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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>
This commit is contained in:
Martin Hostettler 2011-02-24 12:51:31 -08:00 committed by Tony Lindgren
parent 7cab8713b1
commit ef4815ab1f
1 changed files with 3 additions and 0 deletions
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3
arch/arm/plat-omap/iommu.c
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@ -104,6 +104,9 @@ static int iommu_enable(struct iommu *obj)
if (!obj)
return -EINVAL;
if (!arch_iommu)
return -ENODEV;
clk_enable(obj->clk);
err = arch_iommu->enable(obj);