sparc: use for_each_sg()

This replaces the plain loop over the sglist array with for_each_sg()
macro which consists of sg_next() function calls.  Since sparc does select
ARCH_HAS_SG_CHAIN, it is necessary to use for_each_sg() in order to loop
over each sg element.  This also help find problems with drivers that do
not properly initialize their sg tables when CONFIG_DEBUG_SG is enabled.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/arch/sparc/kernel/ldc.c b/arch/sparc/kernel/ldc.c
index 7d3ca30fcd15..1ae5eb1bb045 100644
--- a/arch/sparc/kernel/ldc.c
+++ b/arch/sparc/kernel/ldc.c
@@ -2086,6 +2086,7 @@ int ldc_map_sg(struct ldc_channel *lp,
         struct cookie_state state;
         struct ldc_iommu *iommu;
         int err;
+        struct scatterlist *s;
 
         if (map_perm & ~LDC_MAP_ALL)
                 return -EINVAL;
@@ -2112,9 +2113,10 @@ int ldc_map_sg(struct ldc_channel *lp,
         state.pte_idx = (base - iommu->page_table);
         state.nc = 0;
 
-        for (i = 0; i < num_sg; i++)
-                fill_cookies(&state, page_to_pfn(sg_page(&sg[i])) << PAGE_SHIFT,
-                             sg[i].offset, sg[i].length);
+        for_each_sg(sg, s, num_sg, i) {
+                fill_cookies(&state, page_to_pfn(sg_page(s)) << PAGE_SHIFT,
+                             s->offset, s->length);
+        }
 
         return state.nc;
 }