crypto: caam - fix inconsistent assoc dma mapping direction

req->assoc is dma mapped BIDIRECTIONAL and unmapped TO_DEVICE.
Since it is read-only for the device, use TO_DEVICE both for mapping
and unmapping.

Cc: <stable@vger.kernel.org> # 3.9, 3.8
Signed-off-by: NHoria Geanta <horia.geanta@freescale.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/caamalg.c

@@ -1154,7 +1154,7 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req,
 		dst_nents = sg_count(req->dst, req->cryptlen, &dst_chained);
 
 	sgc = dma_map_sg_chained(jrdev, req->assoc, assoc_nents ? : 1,
-				 DMA_BIDIRECTIONAL, assoc_chained);
+				 DMA_TO_DEVICE, assoc_chained);
 	if (likely(req->src == req->dst)) {
 		sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1,
 					 DMA_BIDIRECTIONAL, src_chained);
@@ -1336,7 +1336,7 @@ static struct aead_edesc *aead_giv_edesc_alloc(struct aead_givcrypt_request
 		dst_nents = sg_count(req->dst, req->cryptlen, &dst_chained);
 
 	sgc = dma_map_sg_chained(jrdev, req->assoc, assoc_nents ? : 1,
-				 DMA_BIDIRECTIONAL, assoc_chained);
+				 DMA_TO_DEVICE, assoc_chained);
 	if (likely(req->src == req->dst)) {
 		sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1,
 					 DMA_BIDIRECTIONAL, src_chained);