SPARC: sg chaining support

This updates the sparc iommu/pci dma mappers to sg chaining.

Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/arch/sparc/mm/io-unit.c b/arch/sparc/mm/io-unit.c
index 7c89893b1fe8..375b4db63704 100644
--- a/arch/sparc/mm/io-unit.c
+++ b/arch/sparc/mm/io-unit.c
@@ -11,8 +11,8 @@
 #include <linux/mm.h>
 #include <linux/highmem.h>      /* pte_offset_map => kmap_atomic */
 #include <linux/bitops.h>
+#include <linux/scatterlist.h>
 
-#include <asm/scatterlist.h>
 #include <asm/pgalloc.h>
 #include <asm/pgtable.h>
 #include <asm/sbus.h>
@@ -144,8 +144,9 @@ static void iounit_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus
         spin_lock_irqsave(&iounit->lock, flags);
         while (sz != 0) {
                 --sz;
-                sg[sz].dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
-                sg[sz].dvma_length = sg[sz].length;
+                sg->dvma_address = iounit_get_area(iounit, (unsigned long)page_address(sg->page) + sg->offset, sg->length);
+                sg->dvma_length = sg->length;
+                sg = sg_next(sg);
         }
         spin_unlock_irqrestore(&iounit->lock, flags);
 }
@@ -173,11 +174,12 @@ static void iounit_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_
         spin_lock_irqsave(&iounit->lock, flags);
         while (sz != 0) {
                 --sz;
-                len = ((sg[sz].dvma_address & ~PAGE_MASK) + sg[sz].length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
-                vaddr = (sg[sz].dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
+                len = ((sg->dvma_address & ~PAGE_MASK) + sg->length + (PAGE_SIZE-1)) >> PAGE_SHIFT;
+                vaddr = (sg->dvma_address - IOUNIT_DMA_BASE) >> PAGE_SHIFT;
                 IOD(("iounit_release %08lx-%08lx\n", (long)vaddr, (long)len+vaddr));
                 for (len += vaddr; vaddr < len; vaddr++)
                         clear_bit(vaddr, iounit->bmap);
+                sg = sg_next(sg);
         }
         spin_unlock_irqrestore(&iounit->lock, flags);
 }