[PATCH 11/25] SPARC32: Fix iommu_flush_iotlb end address

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
------------------

From: David Miller <davem@xxxxxxxxxxxxx>

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@xxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 arch/sparc/mm/iommu.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- linux-2.6.17.1.orig/arch/sparc/mm/iommu.c
+++ linux-2.6.17.1/arch/sparc/mm/iommu.c
@@ -144,8 +144,9 @@ static void iommu_flush_iotlb(iopte_t *i
 	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);

--
-
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