From: David Miller <davem@davemloft.net>
Date: Tue, 20 Jun 2006 07:44:27 +0000 (-0700)
Subject: [PATCH] SPARC32: Fix iommu_flush_iotlb end address
X-Git-Tag: v2.6.17.2~14
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=50cdbb604d8e4f38c30e387ef28433a02b91e6f1;p=thirdparty%2Fkernel%2Fstable.git

[PATCH] 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>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---

diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c
index 77840c8047866..7215849db392e 100644
--- 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);