bounce: fix cache maintenance for bounced highmem pages

the bounced page should be flushed after memcpy, to ensure that
architecture implementations can synchronize instruction and data
caches of the copied data.

Change-Id: I095a3463ec7fdaff3d0ff416f5648bc661fb5f8a
Signed-off-by: Gary King <gking@nvidia.com>

diff --git a/mm/bounce.c b/mm/bounce.c
index 13b6dad..1481de6 100644 (file)
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -116,8 +116,8 @@ static void copy_to_high_bio_irq(struct bio *to, struct bio *from)
                 */
                vfrom = page_address(fromvec->bv_page) + tovec->bv_offset;
 
-               flush_dcache_page(tovec->bv_page);
                bounce_copy_vec(tovec, vfrom);
+               flush_dcache_page(tovec->bv_page);
        }
 }