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[IA64] fix SBA IOMMU to handle allocation failure properly
It's possible that SBA IOMMU might fail to find I/O space under heavy I/Os. SBA IOMMU panics on allocation failure but it shouldn't; drivers can handle the failure. The majority of other IOMMU drivers don't panic on allocation failure. This patch fixes SBA IOMMU path to handle allocation failure properly. Signed-off-by: FUJITA Tomonori <[email protected]> Cc: Fenghua Yu <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Tony Luck <[email protected]>
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