[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>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index d9ef0c7580ea..a9c44c0ae0a7 100644
--- 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;