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[SPARC64]: Handle zero-length map requests in pci_sun4v.c
By simply changing the do-while loop into a plain while loop. Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -57,7 +57,7 @@ static long pci_iommu_batch_flush(struct pci_iommu_batch *p)
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u64 *pglist = p->pglist;
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unsigned long npages = p->npages;
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do {
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while (npages != 0) {
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long num;
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num = pci_sun4v_iommu_map(devhandle, HV_PCI_TSBID(0, entry),
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@ -75,7 +75,7 @@ static long pci_iommu_batch_flush(struct pci_iommu_batch *p)
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entry += num;
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npages -= num;
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pglist += num;
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} while (npages != 0);
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}
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p->entry = entry;
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p->npages = 0;
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