suspend-vs-iommu: prevent suspend if we could not resume
iommu/gart support misses suspend/resume code, which can do bad stuff, including memory corruption on resume. Prevent system suspend in case we would be unable to resume. Signed-off-by: NPavel Machek <pavel@suse.cz> Tested-by: NPatrick <ragamuffin@datacomm.ch> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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