Revert "[POWERPC] DMA 4GB boundary protection"

This reverts commit 618d3adc351a24c4c48437c767befb88ca2d199d, because
it is superseded by 569975591c5530fdc9c7a3c45122e5e46f075a74.

1 files changed, 0 insertions, 10 deletions

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index d2598e2e7bbe..c08ceca6277d 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -89,7 +89,6 @@ static unsigned long iommu_range_alloc(struct iommu_table *tbl,
                                        unsigned int align_order)
 { 
         unsigned long n, end, i, start;
-        unsigned long start_addr, end_addr;
         unsigned long limit;
         int largealloc = npages > 15;
         int pass = 0;
@@ -160,15 +159,6 @@ static unsigned long iommu_range_alloc(struct iommu_table *tbl,
                 }
         }
 
-        /* DMA cannot cross 4 GB boundary */
-        start_addr = (n + tbl->it_offset) << PAGE_SHIFT;
-        end_addr = (end + tbl->it_offset) << PAGE_SHIFT;
-        if ((start_addr >> 32) != (end_addr >> 32)) {
-                end_addr &= 0xffffffff00000000l;
-                start = (end_addr >> PAGE_SHIFT) - tbl->it_offset;
-                goto again;
-        }
-
         for (i = n; i < end; i++)
                 if (test_bit(i, tbl->it_map)) {
                         start = i+1;