crypto: rockchip - add fallback for ahash

Adds a fallback for all case hardware cannot handle.

Fixes: ce0183cb6464b ("crypto: rockchip - switch to skcipher API")
Reviewed-by: John Keeping <john@metanate.com>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/rockchip/rk3288_crypto_ahash.c b/drivers/crypto/rockchip/rk3288_crypto_ahash.c
index 49017d1..16009bb 100644 (file)
--- a/drivers/crypto/rockchip/rk3288_crypto_ahash.c
+++ b/drivers/crypto/rockchip/rk3288_crypto_ahash.c
@@ -16,6 +16,40 @@
  * so we put the fixed hash out when met zero message.
  */
 
+static bool rk_ahash_need_fallback(struct ahash_request *req)
+{
+       struct scatterlist *sg;
+
+       sg = req->src;
+       while (sg) {
+               if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
+                       return true;
+               }
+               if (sg->length % 4) {
+                       return true;
+               }
+               sg = sg_next(sg);
+       }
+       return false;
+}
+
+static int rk_ahash_digest_fb(struct ahash_request *areq)
+{
+       struct rk_ahash_rctx *rctx = ahash_request_ctx(areq);
+       struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
+       struct rk_ahash_ctx *tfmctx = crypto_ahash_ctx(tfm);
+
+       ahash_request_set_tfm(&rctx->fallback_req, tfmctx->fallback_tfm);
+       rctx->fallback_req.base.flags = areq->base.flags &
+                                       CRYPTO_TFM_REQ_MAY_SLEEP;
+
+       rctx->fallback_req.nbytes = areq->nbytes;
+       rctx->fallback_req.src = areq->src;
+       rctx->fallback_req.result = areq->result;
+
+       return crypto_ahash_digest(&rctx->fallback_req);
+}
+
 static int zero_message_process(struct ahash_request *req)
 {
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
@@ -167,6 +201,9 @@ static int rk_ahash_digest(struct ahash_request *req)
        struct rk_ahash_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
        struct rk_crypto_info *dev = tctx->dev;
 
+       if (rk_ahash_need_fallback(req))
+               return rk_ahash_digest_fb(req);
+
        if (!req->nbytes)
                return zero_message_process(req);
        else
@@ -309,6 +346,7 @@ static void rk_cra_hash_exit(struct crypto_tfm *tfm)
        struct rk_ahash_ctx *tctx = crypto_tfm_ctx(tfm);
 
        free_page((unsigned long)tctx->dev->addr_vir);
+       crypto_free_ahash(tctx->fallback_tfm);
 }
 
 struct rk_crypto_tmp rk_ahash_sha1 = {