[CRYPTO] api: Flush the current page right than the next

On platforms where flush_dcache_page is needed we're currently flushing
the next page right than the one we've just processed.  This patch fixes
the off-by-one error.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 2 deletions

diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c
index 0f76175f623f..81afd1790a1d 100644
--- a/crypto/scatterwalk.c
+++ b/crypto/scatterwalk.c
@@ -59,8 +59,12 @@ EXPORT_SYMBOL_GPL(scatterwalk_map);
 static void scatterwalk_pagedone(struct scatter_walk *walk, int out,
                                  unsigned int more)
 {
-        if (out)
-                flush_dcache_page(scatterwalk_page(walk));
+        if (out) {
+                struct page *page;
+
+                page = walk->sg->page + ((walk->offset - 1) >> PAGE_SHIFT);
+                flush_dcache_page(page);
+        }
 
         if (more) {
                 walk->offset += PAGE_SIZE - 1;