crypto: ccree - use std api sg_zero_buffer

Replace internal cc_zero_sgl() with kernel API of the same function
sg_zero_buffer().
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/ccree/cc_aead.c

@@ -236,7 +236,8 @@ static void cc_aead_complete(struct device *dev, void *cc_req, int err)
 			/* In case of payload authentication failure, MUST NOT
 			 * revealed the decrypted message --> zero its memory.
 			 */
-			cc_zero_sgl(areq->dst, areq->cryptlen);
+			sg_zero_buffer(areq->dst, sg_nents(areq->dst),
+				       areq->cryptlen, 0);
 			err = -EBADMSG;
 		}
 	/*ENCRYPT*/

drivers/crypto/ccree/cc_buffer_mgr.c

@@ -99,27 +99,6 @@ static unsigned int cc_get_sgl_nents(struct device *dev,
 	return nents;
 }
 
-/**
- * cc_zero_sgl() - Zero scatter scatter list data.
- *
- * @sgl:
- */
-void cc_zero_sgl(struct scatterlist *sgl, u32 data_len)
-{
-	struct scatterlist *current_sg = sgl;
-	int sg_index = 0;
-
-	while (sg_index <= data_len) {
-		if (!current_sg) {
-			/* reached the end of the sgl --> just return back */
-			return;
-		}
-		memset(sg_virt(current_sg), 0, current_sg->length);
-		sg_index += current_sg->length;
-		current_sg = sg_next(current_sg);
-	}
-}
-
 /**
  * cc_copy_sg_portion() - Copy scatter list data,
  * from to_skip to end, to dest and vice versa

drivers/crypto/ccree/cc_buffer_mgr.h

@@ -66,6 +66,4 @@ void cc_unmap_hash_request(struct device *dev, void *ctx,
 void cc_copy_sg_portion(struct device *dev, u8 *dest, struct scatterlist *sg,
 			u32 to_skip, u32 end, enum cc_sg_cpy_direct direct);
 
-void cc_zero_sgl(struct scatterlist *sgl, u32 data_len);
-
 #endif /*__BUFFER_MGR_H__*/