crypto: rockchip - return the err code when unable dequeue the crypto request

Sometime we would unable to dequeue the crypto request, in this case,
we should finish crypto and return the err code.

Signed-off-by: zain wang <wzz@rock-chips.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/rockchip/rk3288_crypto_ahash.c

@@ -166,6 +166,7 @@ static int rk_ahash_digest(struct ahash_request *req)
 {
 	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 	struct rk_ahash_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
+	struct crypto_async_request *async_req, *backlog;
 	struct rk_crypto_info *dev = NULL;
 	unsigned long flags;
 	int ret;
@@ -202,8 +203,21 @@ static int rk_ahash_digest(struct ahash_request *req)
 
 	spin_lock_irqsave(&dev->lock, flags);
 	ret = crypto_enqueue_request(&dev->queue, &req->base);
+	backlog   = crypto_get_backlog(&dev->queue);
+	async_req = crypto_dequeue_request(&dev->queue);
 	spin_unlock_irqrestore(&dev->lock, flags);
 
+	if (!async_req) {
+		dev_err(dev->dev, "async_req is NULL !!\n");
+		return ret;
+	}
+	if (backlog) {
+		backlog->complete(backlog, -EINPROGRESS);
+		backlog = NULL;
+	}
+
+	dev->ahash_req = ahash_request_cast(async_req);
+
 	tasklet_schedule(&dev->queue_task);
 
 	/*