X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=crypto%2Fasync_tx%2Fasync_xor.c;h=595b78672b36ad90e27cf50ed28126bb43970fb5;hb=fa623d1b0222adbe8f822e53c08003b9679a410c;hp=c029d3eb9ef0a76ed248deb4a40e47511ba12afe;hpb=2be4ff2f084842839b041b793ed6237e8d1d315a;p=linux-2.6-omap-h63xx.git

diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
index c029d3eb9ef..595b78672b3 100644
--- a/crypto/async_tx/async_xor.c
+++ b/crypto/async_tx/async_xor.c
@@ -53,10 +53,17 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list,
 	int xor_src_cnt;
 	dma_addr_t dma_dest;
 
-	dma_dest = dma_map_page(dma->dev, dest, offset, len, DMA_FROM_DEVICE);
-	for (i = 0; i < src_cnt; i++)
+	/* map the dest bidrectional in case it is re-used as a source */
+	dma_dest = dma_map_page(dma->dev, dest, offset, len, DMA_BIDIRECTIONAL);
+	for (i = 0; i < src_cnt; i++) {
+		/* only map the dest once */
+		if (unlikely(src_list[i] == dest)) {
+			dma_src[i] = dma_dest;
+			continue;
+		}
 		dma_src[i] = dma_map_page(dma->dev, src_list[i], offset,
 					  len, DMA_TO_DEVICE);
+	}
 
 	while (src_cnt) {
 		async_flags = flags;