SPARC32: Fix iommu_flush_iotlb end address

Fix the calculation of the end address when flushing iotlb entries to
ram.  This bug has been a cause of esp dma errors, and it affects
HyperSPARC systems much worse than SuperSPARC systems.

Signed-off-by: Bob Breuer <breuerr@mc.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c
index 77840c80478665058b778939b3219861d9744e5e..7215849db392e507552ed2c4a499e7c78ef8809b 100644 (file)
--- a/arch/sparc/mm/iommu.c
+++ b/arch/sparc/mm/iommu.c
@@ -144,8 +144,9 @@ static void iommu_flush_iotlb(iopte_t *iopte, unsigned int niopte)
        unsigned long start;
        unsigned long end;
 
-       start = (unsigned long)iopte & PAGE_MASK;
+       start = (unsigned long)iopte;
        end = PAGE_ALIGN(start + niopte*sizeof(iopte_t));
+       start &= PAGE_MASK;
        if (viking_mxcc_present) {
                while(start < end) {
                        viking_mxcc_flush_page(start);