[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>

diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index d9ef0c7580ea3c41b45f146e33ce52d1b3cb01ab..a9c44c0ae0a78eab6647d585f8a48699af985b3f 100644 (file)
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -57,7 +57,7 @@ static long pci_iommu_batch_flush(struct pci_iommu_batch *p)
        u64 *pglist = p->pglist;
        unsigned long npages = p->npages;
 
-       do {
+       while (npages != 0) {
                long num;
 
                num = pci_sun4v_iommu_map(devhandle, HV_PCI_TSBID(0, entry),
@@ -75,7 +75,7 @@ static long pci_iommu_batch_flush(struct pci_iommu_batch *p)
                entry += num;
                npages -= num;
                pglist += num;
-       } while (npages != 0);
+       }
 
        p->entry = entry;
        p->npages = 0;