virtio-crypto: change code style

Use temporary variable to make code easy to read and maintain.
	/* Pad cipher's parameters */
        vcrypto->ctrl.u.sym_create_session.op_type =
                cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
        vcrypto->ctrl.u.sym_create_session.u.cipher.para.algo =
                vcrypto->ctrl.header.algo;
        vcrypto->ctrl.u.sym_create_session.u.cipher.para.keylen =
                cpu_to_le32(keylen);
        vcrypto->ctrl.u.sym_create_session.u.cipher.para.op =
                cpu_to_le32(op);
-->
	sym_create_session = &ctrl->u.sym_create_session;
	sym_create_session->op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
	sym_create_session->u.cipher.para.algo = ctrl->header.algo;
	sym_create_session->u.cipher.para.keylen = cpu_to_le32(keylen);
	sym_create_session->u.cipher.para.op = cpu_to_le32(op);

The new style shows more obviously:
- the variable we want to operate.
- an assignment statement in a single line.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20220506131627.180784-2-pizhenwei@bytedance.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/crypto/virtio/virtio_crypto_akcipher_algs.c

@@ -106,23 +106,27 @@ static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher
 	unsigned int inlen;
 	int err;
 	unsigned int num_out = 0, num_in = 0;
+	struct virtio_crypto_op_ctrl_req *ctrl;
+	struct virtio_crypto_session_input *input;
 
 	pkey = kmemdup(key, keylen, GFP_ATOMIC);
 	if (!pkey)
 		return -ENOMEM;
 
 	spin_lock(&vcrypto->ctrl_lock);
-	memcpy(&vcrypto->ctrl.header, header, sizeof(vcrypto->ctrl.header));
-	memcpy(&vcrypto->ctrl.u, para, sizeof(vcrypto->ctrl.u));
-	vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
+	ctrl = &vcrypto->ctrl;
+	memcpy(&ctrl->header, header, sizeof(ctrl->header));
+	memcpy(&ctrl->u, para, sizeof(ctrl->u));
+	input = &vcrypto->input;
+	input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
 
-	sg_init_one(&outhdr_sg, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
+	sg_init_one(&outhdr_sg, ctrl, sizeof(*ctrl));
 	sgs[num_out++] = &outhdr_sg;
 
 	sg_init_one(&key_sg, pkey, keylen);
 	sgs[num_out++] = &key_sg;
 
-	sg_init_one(&inhdr_sg, &vcrypto->input, sizeof(vcrypto->input));
+	sg_init_one(&inhdr_sg, input, sizeof(*input));
 	sgs[num_out + num_in++] = &inhdr_sg;
 
 	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto, GFP_ATOMIC);
@@ -134,12 +138,12 @@ static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher
 	       !virtqueue_is_broken(vcrypto->ctrl_vq))
 		cpu_relax();
 
-	if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
+	if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
 		err = -EINVAL;
 		goto out;
 	}
 
-	ctx->session_id = le64_to_cpu(vcrypto->input.session_id);
+	ctx->session_id = le64_to_cpu(input->session_id);
 	ctx->session_valid = true;
 	err = 0;
 
@@ -149,7 +153,7 @@ static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher
 
 	if (err < 0)
 		pr_err("virtio_crypto: Create session failed status: %u\n",
-			le32_to_cpu(vcrypto->input.status));
+			le32_to_cpu(input->status));
 
 	return err;
 }
@@ -161,23 +165,27 @@ static int virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akciphe
 	struct virtio_crypto *vcrypto = ctx->vcrypto;
 	unsigned int num_out = 0, num_in = 0, inlen;
 	int err;
+	struct virtio_crypto_op_ctrl_req *ctrl;
+	struct virtio_crypto_inhdr *ctrl_status;
 
 	spin_lock(&vcrypto->ctrl_lock);
 	if (!ctx->session_valid) {
 		err = 0;
 		goto out;
 	}
-	vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR;
-	vcrypto->ctrl.header.opcode = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION);
-	vcrypto->ctrl.header.queue_id = 0;
+	ctrl_status = &vcrypto->ctrl_status;
+	ctrl_status->status = VIRTIO_CRYPTO_ERR;
+	ctrl = &vcrypto->ctrl;
+	ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION);
+	ctrl->header.queue_id = 0;
 
-	destroy_session = &vcrypto->ctrl.u.destroy_session;
+	destroy_session = &ctrl->u.destroy_session;
 	destroy_session->session_id = cpu_to_le64(ctx->session_id);
 
-	sg_init_one(&outhdr_sg, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
+	sg_init_one(&outhdr_sg, ctrl, sizeof(*ctrl));
 	sgs[num_out++] = &outhdr_sg;
 
-	sg_init_one(&inhdr_sg, &vcrypto->ctrl_status.status, sizeof(vcrypto->ctrl_status.status));
+	sg_init_one(&inhdr_sg, &ctrl_status->status, sizeof(ctrl_status->status));
 	sgs[num_out + num_in++] = &inhdr_sg;
 
 	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto, GFP_ATOMIC);
@@ -189,7 +197,7 @@ static int virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akciphe
 	       !virtqueue_is_broken(vcrypto->ctrl_vq))
 		cpu_relax();
 
-	if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
+	if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
 		err = -EINVAL;
 		goto out;
 	}
@@ -201,7 +209,7 @@ static int virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akciphe
 	spin_unlock(&vcrypto->ctrl_lock);
 	if (err < 0) {
 		pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
-			vcrypto->ctrl_status.status, destroy_session->session_id);
+			ctrl_status->status, destroy_session->session_id);
 	}
 
 	return err;

drivers/crypto/virtio/virtio_crypto_skcipher_algs.c

@@ -123,6 +123,9 @@ static int virtio_crypto_alg_skcipher_init_session(
 	int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT : VIRTIO_CRYPTO_OP_DECRYPT;
 	int err;
 	unsigned int num_out = 0, num_in = 0;
+	struct virtio_crypto_op_ctrl_req *ctrl;
+	struct virtio_crypto_session_input *input;
+	struct virtio_crypto_sym_create_session_req *sym_create_session;
 
 	/*
 	 * Avoid to do DMA from the stack, switch to using
@@ -135,24 +138,22 @@ static int virtio_crypto_alg_skcipher_init_session(
 
 	spin_lock(&vcrypto->ctrl_lock);
 	/* Pad ctrl header */
-	vcrypto->ctrl.header.opcode =
-		cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
-	vcrypto->ctrl.header.algo = cpu_to_le32(alg);
+	ctrl = &vcrypto->ctrl;
+	ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
+	ctrl->header.algo = cpu_to_le32(alg);
 	/* Set the default dataqueue id to 0 */
-	vcrypto->ctrl.header.queue_id = 0;
+	ctrl->header.queue_id = 0;
 
-	vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
+	input = &vcrypto->input;
+	input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
 	/* Pad cipher's parameters */
-	vcrypto->ctrl.u.sym_create_session.op_type =
-		cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
-	vcrypto->ctrl.u.sym_create_session.u.cipher.para.algo =
-		vcrypto->ctrl.header.algo;
-	vcrypto->ctrl.u.sym_create_session.u.cipher.para.keylen =
-		cpu_to_le32(keylen);
-	vcrypto->ctrl.u.sym_create_session.u.cipher.para.op =
-		cpu_to_le32(op);
-
-	sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
+	sym_create_session = &ctrl->u.sym_create_session;
+	sym_create_session->op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
+	sym_create_session->u.cipher.para.algo = ctrl->header.algo;
+	sym_create_session->u.cipher.para.keylen = cpu_to_le32(keylen);
+	sym_create_session->u.cipher.para.op = cpu_to_le32(op);
+
+	sg_init_one(&outhdr, ctrl, sizeof(*ctrl));
 	sgs[num_out++] = &outhdr;
 
 	/* Set key */
@@ -160,7 +161,7 @@ static int virtio_crypto_alg_skcipher_init_session(
 	sgs[num_out++] = &key_sg;
 
 	/* Return status and session id back */
-	sg_init_one(&inhdr, &vcrypto->input, sizeof(vcrypto->input));
+	sg_init_one(&inhdr, input, sizeof(*input));
 	sgs[num_out + num_in++] = &inhdr;
 
 	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
@@ -180,20 +181,18 @@ static int virtio_crypto_alg_skcipher_init_session(
 	       !virtqueue_is_broken(vcrypto->ctrl_vq))
 		cpu_relax();
 
-	if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
+	if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
 		spin_unlock(&vcrypto->ctrl_lock);
 		pr_err("virtio_crypto: Create session failed status: %u\n",
-			le32_to_cpu(vcrypto->input.status));
+			le32_to_cpu(input->status));
 		kfree_sensitive(cipher_key);
 		return -EINVAL;
 	}
 
 	if (encrypt)
-		ctx->enc_sess_info.session_id =
-			le64_to_cpu(vcrypto->input.session_id);
+		ctx->enc_sess_info.session_id = le64_to_cpu(input->session_id);
 	else
-		ctx->dec_sess_info.session_id =
-			le64_to_cpu(vcrypto->input.session_id);
+		ctx->dec_sess_info.session_id = le64_to_cpu(input->session_id);
 
 	spin_unlock(&vcrypto->ctrl_lock);
 
@@ -211,30 +210,30 @@ static int virtio_crypto_alg_skcipher_close_session(
 	struct virtio_crypto *vcrypto = ctx->vcrypto;
 	int err;
 	unsigned int num_out = 0, num_in = 0;
+	struct virtio_crypto_op_ctrl_req *ctrl;
+	struct virtio_crypto_inhdr *ctrl_status;
 
 	spin_lock(&vcrypto->ctrl_lock);
-	vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR;
+	ctrl_status = &vcrypto->ctrl_status;
+	ctrl_status->status = VIRTIO_CRYPTO_ERR;
 	/* Pad ctrl header */
-	vcrypto->ctrl.header.opcode =
-		cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
+	ctrl = &vcrypto->ctrl;
+	ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
 	/* Set the default virtqueue id to 0 */
-	vcrypto->ctrl.header.queue_id = 0;
+	ctrl->header.queue_id = 0;
 
-	destroy_session = &vcrypto->ctrl.u.destroy_session;
+	destroy_session = &ctrl->u.destroy_session;
 
 	if (encrypt)
-		destroy_session->session_id =
-			cpu_to_le64(ctx->enc_sess_info.session_id);
+		destroy_session->session_id = cpu_to_le64(ctx->enc_sess_info.session_id);
 	else
-		destroy_session->session_id =
-			cpu_to_le64(ctx->dec_sess_info.session_id);
+		destroy_session->session_id = cpu_to_le64(ctx->dec_sess_info.session_id);
 
-	sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
+	sg_init_one(&outhdr, ctrl, sizeof(*ctrl));
 	sgs[num_out++] = &outhdr;
 
 	/* Return status and session id back */
-	sg_init_one(&status_sg, &vcrypto->ctrl_status.status,
-		sizeof(vcrypto->ctrl_status.status));
+	sg_init_one(&status_sg, &ctrl_status->status, sizeof(ctrl_status->status));
 	sgs[num_out + num_in++] = &status_sg;
 
 	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
@@ -249,11 +248,10 @@ static int virtio_crypto_alg_skcipher_close_session(
 	       !virtqueue_is_broken(vcrypto->ctrl_vq))
 		cpu_relax();
 
-	if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
+	if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
 		spin_unlock(&vcrypto->ctrl_lock);
 		pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
-			vcrypto->ctrl_status.status,
-			destroy_session->session_id);
+			ctrl_status->status, destroy_session->session_id);
 
 		return -EINVAL;
 	}