1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Algorithms supported by virtio crypto device 3 * 4 * Authors: Gonglei <arei.gonglei@huawei.com> 5 * 6 * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD. 7 */ 8 9 #include <crypto/engine.h> 10 #include <crypto/internal/skcipher.h> 11 #include <crypto/scatterwalk.h> 12 #include <linux/err.h> 13 #include <linux/scatterlist.h> 14 #include <uapi/linux/virtio_crypto.h> 15 #include "virtio_crypto_common.h" 16 17 18 struct virtio_crypto_skcipher_ctx { 19 struct virtio_crypto *vcrypto; 20 21 struct virtio_crypto_sym_session_info enc_sess_info; 22 struct virtio_crypto_sym_session_info dec_sess_info; 23 }; 24 25 struct virtio_crypto_sym_request { 26 struct virtio_crypto_request base; 27 28 /* Cipher or aead */ 29 uint32_t type; 30 uint8_t *iv; 31 /* Encryption? */ 32 bool encrypt; 33 }; 34 35 struct virtio_crypto_algo { 36 uint32_t algonum; 37 uint32_t service; 38 unsigned int active_devs; 39 struct skcipher_engine_alg algo; 40 }; 41 42 /* 43 * The algs_lock protects the below global virtio_crypto_active_devs 44 * and crypto algorithms registion. 45 */ 46 static DEFINE_MUTEX(algs_lock); 47 static void virtio_crypto_skcipher_finalize_req( 48 struct virtio_crypto_sym_request *vc_sym_req, 49 struct skcipher_request *req, 50 int err); 51 52 static void virtio_crypto_dataq_sym_callback 53 (struct virtio_crypto_request *vc_req, int len) 54 { 55 struct virtio_crypto_sym_request *vc_sym_req = 56 container_of(vc_req, struct virtio_crypto_sym_request, base); 57 struct skcipher_request *ablk_req = 58 container_of((void *)vc_sym_req, struct skcipher_request, 59 __ctx); 60 int error; 61 62 /* Finish the encrypt or decrypt process */ 63 if (vc_sym_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) { 64 switch (vc_req->status) { 65 case VIRTIO_CRYPTO_OK: 66 error = 0; 67 break; 68 case VIRTIO_CRYPTO_INVSESS: 69 case VIRTIO_CRYPTO_ERR: 70 error = -EINVAL; 71 break; 72 case VIRTIO_CRYPTO_BADMSG: 73 error = -EBADMSG; 74 break; 75 default: 76 error = -EIO; 77 break; 78 } 79 virtio_crypto_skcipher_finalize_req(vc_sym_req, 80 ablk_req, error); 81 } 82 } 83 84 static u64 virtio_crypto_alg_sg_nents_length(struct scatterlist *sg) 85 { 86 u64 total = 0; 87 88 for (total = 0; sg; sg = sg_next(sg)) 89 total += sg->length; 90 91 return total; 92 } 93 94 static int 95 virtio_crypto_alg_validate_key(int key_len, uint32_t *alg) 96 { 97 switch (key_len) { 98 case AES_KEYSIZE_128: 99 case AES_KEYSIZE_192: 100 case AES_KEYSIZE_256: 101 *alg = VIRTIO_CRYPTO_CIPHER_AES_CBC; 102 break; 103 default: 104 return -EINVAL; 105 } 106 return 0; 107 } 108 109 static int virtio_crypto_alg_skcipher_init_session( 110 struct virtio_crypto_skcipher_ctx *ctx, 111 uint32_t alg, const uint8_t *key, 112 unsigned int keylen, 113 int encrypt) 114 { 115 struct scatterlist outhdr, key_sg, inhdr, *sgs[3]; 116 struct virtio_crypto *vcrypto = ctx->vcrypto; 117 int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT : VIRTIO_CRYPTO_OP_DECRYPT; 118 int err; 119 unsigned int num_out = 0, num_in = 0; 120 struct virtio_crypto_op_ctrl_req *ctrl; 121 struct virtio_crypto_session_input *input; 122 struct virtio_crypto_sym_create_session_req *sym_create_session; 123 struct virtio_crypto_ctrl_request *vc_ctrl_req; 124 125 /* 126 * Avoid to do DMA from the stack, switch to using 127 * dynamically-allocated for the key 128 */ 129 uint8_t *cipher_key = kmemdup(key, keylen, GFP_ATOMIC); 130 131 if (!cipher_key) 132 return -ENOMEM; 133 134 vc_ctrl_req = kzalloc_obj(*vc_ctrl_req); 135 if (!vc_ctrl_req) { 136 err = -ENOMEM; 137 goto out; 138 } 139 140 /* Pad ctrl header */ 141 ctrl = &vc_ctrl_req->ctrl; 142 ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION); 143 ctrl->header.algo = cpu_to_le32(alg); 144 /* Set the default dataqueue id to 0 */ 145 ctrl->header.queue_id = 0; 146 147 input = &vc_ctrl_req->input; 148 input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR); 149 /* Pad cipher's parameters */ 150 sym_create_session = &ctrl->u.sym_create_session; 151 sym_create_session->op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER); 152 sym_create_session->u.cipher.para.algo = ctrl->header.algo; 153 sym_create_session->u.cipher.para.keylen = cpu_to_le32(keylen); 154 sym_create_session->u.cipher.para.op = cpu_to_le32(op); 155 156 sg_init_one(&outhdr, ctrl, sizeof(*ctrl)); 157 sgs[num_out++] = &outhdr; 158 159 /* Set key */ 160 sg_init_one(&key_sg, cipher_key, keylen); 161 sgs[num_out++] = &key_sg; 162 163 /* Return status and session id back */ 164 sg_init_one(&inhdr, input, sizeof(*input)); 165 sgs[num_out + num_in++] = &inhdr; 166 167 err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req); 168 if (err < 0) 169 goto out; 170 171 if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) { 172 pr_err("virtio_crypto: Create session failed status: %u\n", 173 le32_to_cpu(input->status)); 174 err = -EINVAL; 175 goto out; 176 } 177 178 if (encrypt) 179 ctx->enc_sess_info.session_id = le64_to_cpu(input->session_id); 180 else 181 ctx->dec_sess_info.session_id = le64_to_cpu(input->session_id); 182 183 err = 0; 184 out: 185 kfree(vc_ctrl_req); 186 kfree_sensitive(cipher_key); 187 return err; 188 } 189 190 static int virtio_crypto_alg_skcipher_close_session( 191 struct virtio_crypto_skcipher_ctx *ctx, 192 int encrypt) 193 { 194 struct scatterlist outhdr, status_sg, *sgs[2]; 195 struct virtio_crypto_destroy_session_req *destroy_session; 196 struct virtio_crypto *vcrypto = ctx->vcrypto; 197 int err; 198 unsigned int num_out = 0, num_in = 0; 199 struct virtio_crypto_op_ctrl_req *ctrl; 200 struct virtio_crypto_inhdr *ctrl_status; 201 struct virtio_crypto_ctrl_request *vc_ctrl_req; 202 203 vc_ctrl_req = kzalloc_obj(*vc_ctrl_req); 204 if (!vc_ctrl_req) 205 return -ENOMEM; 206 207 ctrl_status = &vc_ctrl_req->ctrl_status; 208 ctrl_status->status = VIRTIO_CRYPTO_ERR; 209 /* Pad ctrl header */ 210 ctrl = &vc_ctrl_req->ctrl; 211 ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION); 212 /* Set the default virtqueue id to 0 */ 213 ctrl->header.queue_id = 0; 214 215 destroy_session = &ctrl->u.destroy_session; 216 217 if (encrypt) 218 destroy_session->session_id = cpu_to_le64(ctx->enc_sess_info.session_id); 219 else 220 destroy_session->session_id = cpu_to_le64(ctx->dec_sess_info.session_id); 221 222 sg_init_one(&outhdr, ctrl, sizeof(*ctrl)); 223 sgs[num_out++] = &outhdr; 224 225 /* Return status and session id back */ 226 sg_init_one(&status_sg, &ctrl_status->status, sizeof(ctrl_status->status)); 227 sgs[num_out + num_in++] = &status_sg; 228 229 err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req); 230 if (err < 0) 231 goto out; 232 233 if (ctrl_status->status != VIRTIO_CRYPTO_OK) { 234 pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n", 235 ctrl_status->status, 236 le64_to_cpu(destroy_session->session_id)); 237 238 err = -EINVAL; 239 goto out; 240 } 241 242 err = 0; 243 out: 244 kfree(vc_ctrl_req); 245 return err; 246 } 247 248 static int virtio_crypto_alg_skcipher_init_sessions( 249 struct virtio_crypto_skcipher_ctx *ctx, 250 const uint8_t *key, unsigned int keylen) 251 { 252 uint32_t alg; 253 int ret; 254 struct virtio_crypto *vcrypto = ctx->vcrypto; 255 256 if (keylen > vcrypto->max_cipher_key_len) { 257 pr_err("virtio_crypto: the key is too long\n"); 258 return -EINVAL; 259 } 260 261 if (virtio_crypto_alg_validate_key(keylen, &alg)) 262 return -EINVAL; 263 264 /* Create encryption session */ 265 ret = virtio_crypto_alg_skcipher_init_session(ctx, 266 alg, key, keylen, 1); 267 if (ret) 268 return ret; 269 /* Create decryption session */ 270 ret = virtio_crypto_alg_skcipher_init_session(ctx, 271 alg, key, keylen, 0); 272 if (ret) { 273 virtio_crypto_alg_skcipher_close_session(ctx, 1); 274 return ret; 275 } 276 return 0; 277 } 278 279 /* Note: kernel crypto API realization */ 280 static int virtio_crypto_skcipher_setkey(struct crypto_skcipher *tfm, 281 const uint8_t *key, 282 unsigned int keylen) 283 { 284 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); 285 uint32_t alg; 286 int ret; 287 288 ret = virtio_crypto_alg_validate_key(keylen, &alg); 289 if (ret) 290 return ret; 291 292 if (!ctx->vcrypto) { 293 /* New key */ 294 int node = virtio_crypto_get_current_node(); 295 struct virtio_crypto *vcrypto = 296 virtcrypto_get_dev_node(node, 297 VIRTIO_CRYPTO_SERVICE_CIPHER, alg); 298 if (!vcrypto) { 299 pr_err("virtio_crypto: Could not find a virtio device in the system or unsupported algo\n"); 300 return -ENODEV; 301 } 302 303 ctx->vcrypto = vcrypto; 304 } else { 305 /* Rekeying, we should close the created sessions previously */ 306 virtio_crypto_alg_skcipher_close_session(ctx, 1); 307 virtio_crypto_alg_skcipher_close_session(ctx, 0); 308 } 309 310 ret = virtio_crypto_alg_skcipher_init_sessions(ctx, key, keylen); 311 if (ret) { 312 virtcrypto_dev_put(ctx->vcrypto); 313 ctx->vcrypto = NULL; 314 315 return ret; 316 } 317 318 return 0; 319 } 320 321 static int 322 __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req, 323 struct skcipher_request *req, 324 struct data_queue *data_vq) 325 { 326 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 327 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); 328 struct virtio_crypto_request *vc_req = &vc_sym_req->base; 329 unsigned int ivsize = crypto_skcipher_ivsize(tfm); 330 struct virtio_crypto *vcrypto = ctx->vcrypto; 331 struct virtio_crypto_op_data_req *req_data; 332 int src_nents, dst_nents; 333 int err; 334 unsigned long flags; 335 struct scatterlist outhdr, iv_sg, status_sg, **sgs; 336 u64 dst_len; 337 unsigned int num_out = 0, num_in = 0; 338 int sg_total; 339 uint8_t *iv; 340 struct scatterlist *sg; 341 342 src_nents = sg_nents_for_len(req->src, req->cryptlen); 343 if (src_nents < 0) { 344 pr_err("Invalid number of src SG.\n"); 345 return src_nents; 346 } 347 348 dst_nents = sg_nents(req->dst); 349 350 pr_debug("virtio_crypto: Number of sgs (src_nents: %d, dst_nents: %d)\n", 351 src_nents, dst_nents); 352 353 /* Why 3? outhdr + iv + inhdr */ 354 sg_total = src_nents + dst_nents + 3; 355 sgs = kcalloc_node(sg_total, sizeof(*sgs), GFP_KERNEL, 356 dev_to_node(&vcrypto->vdev->dev)); 357 if (!sgs) 358 return -ENOMEM; 359 360 req_data = kzalloc_node(sizeof(*req_data), GFP_KERNEL, 361 dev_to_node(&vcrypto->vdev->dev)); 362 if (!req_data) { 363 kfree(sgs); 364 return -ENOMEM; 365 } 366 367 vc_req->req_data = req_data; 368 vc_sym_req->type = VIRTIO_CRYPTO_SYM_OP_CIPHER; 369 /* Head of operation */ 370 if (vc_sym_req->encrypt) { 371 req_data->header.session_id = 372 cpu_to_le64(ctx->enc_sess_info.session_id); 373 req_data->header.opcode = 374 cpu_to_le32(VIRTIO_CRYPTO_CIPHER_ENCRYPT); 375 } else { 376 req_data->header.session_id = 377 cpu_to_le64(ctx->dec_sess_info.session_id); 378 req_data->header.opcode = 379 cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DECRYPT); 380 } 381 req_data->u.sym_req.op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER); 382 req_data->u.sym_req.u.cipher.para.iv_len = cpu_to_le32(ivsize); 383 req_data->u.sym_req.u.cipher.para.src_data_len = 384 cpu_to_le32(req->cryptlen); 385 386 dst_len = virtio_crypto_alg_sg_nents_length(req->dst); 387 if (unlikely(dst_len > U32_MAX)) { 388 pr_err("virtio_crypto: The dst_len is beyond U32_MAX\n"); 389 err = -EINVAL; 390 goto free; 391 } 392 393 dst_len = min_t(unsigned int, req->cryptlen, dst_len); 394 pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n", 395 req->cryptlen, dst_len); 396 397 if (unlikely(req->cryptlen + dst_len + ivsize + 398 sizeof(vc_req->status) > vcrypto->max_size)) { 399 pr_err("virtio_crypto: The length is too big\n"); 400 err = -EINVAL; 401 goto free; 402 } 403 404 req_data->u.sym_req.u.cipher.para.dst_data_len = 405 cpu_to_le32((uint32_t)dst_len); 406 407 /* Outhdr */ 408 sg_init_one(&outhdr, req_data, sizeof(*req_data)); 409 sgs[num_out++] = &outhdr; 410 411 /* IV */ 412 413 /* 414 * Avoid to do DMA from the stack, switch to using 415 * dynamically-allocated for the IV 416 */ 417 iv = kzalloc_node(ivsize, GFP_ATOMIC, 418 dev_to_node(&vcrypto->vdev->dev)); 419 if (!iv) { 420 err = -ENOMEM; 421 goto free; 422 } 423 memcpy(iv, req->iv, ivsize); 424 if (!vc_sym_req->encrypt) 425 scatterwalk_map_and_copy(req->iv, req->src, 426 req->cryptlen - AES_BLOCK_SIZE, 427 AES_BLOCK_SIZE, 0); 428 429 sg_init_one(&iv_sg, iv, ivsize); 430 sgs[num_out++] = &iv_sg; 431 vc_sym_req->iv = iv; 432 433 /* Source data */ 434 for (sg = req->src; src_nents; sg = sg_next(sg), src_nents--) 435 sgs[num_out++] = sg; 436 437 /* Destination data */ 438 for (sg = req->dst; sg; sg = sg_next(sg)) 439 sgs[num_out + num_in++] = sg; 440 441 /* Status */ 442 sg_init_one(&status_sg, &vc_req->status, sizeof(vc_req->status)); 443 sgs[num_out + num_in++] = &status_sg; 444 445 vc_req->sgs = sgs; 446 447 spin_lock_irqsave(&data_vq->lock, flags); 448 err = virtqueue_add_sgs(data_vq->vq, sgs, num_out, 449 num_in, vc_req, GFP_ATOMIC); 450 virtqueue_kick(data_vq->vq); 451 spin_unlock_irqrestore(&data_vq->lock, flags); 452 if (unlikely(err < 0)) 453 goto free_iv; 454 455 return 0; 456 457 free_iv: 458 kfree_sensitive(iv); 459 free: 460 kfree_sensitive(req_data); 461 kfree(sgs); 462 return err; 463 } 464 465 static int virtio_crypto_skcipher_encrypt(struct skcipher_request *req) 466 { 467 struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req); 468 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm); 469 struct virtio_crypto_sym_request *vc_sym_req = 470 skcipher_request_ctx(req); 471 struct virtio_crypto_request *vc_req = &vc_sym_req->base; 472 struct virtio_crypto *vcrypto = ctx->vcrypto; 473 /* Use the first data virtqueue as default */ 474 struct data_queue *data_vq = &vcrypto->data_vq[0]; 475 476 if (!req->cryptlen) 477 return 0; 478 if (req->cryptlen % AES_BLOCK_SIZE) 479 return -EINVAL; 480 481 vc_req->dataq = data_vq; 482 vc_req->alg_cb = virtio_crypto_dataq_sym_callback; 483 vc_sym_req->encrypt = true; 484 485 return crypto_transfer_skcipher_request_to_engine(data_vq->engine, req); 486 } 487 488 static int virtio_crypto_skcipher_decrypt(struct skcipher_request *req) 489 { 490 struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req); 491 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm); 492 struct virtio_crypto_sym_request *vc_sym_req = 493 skcipher_request_ctx(req); 494 struct virtio_crypto_request *vc_req = &vc_sym_req->base; 495 struct virtio_crypto *vcrypto = ctx->vcrypto; 496 /* Use the first data virtqueue as default */ 497 struct data_queue *data_vq = &vcrypto->data_vq[0]; 498 499 if (!req->cryptlen) 500 return 0; 501 if (req->cryptlen % AES_BLOCK_SIZE) 502 return -EINVAL; 503 504 vc_req->dataq = data_vq; 505 vc_req->alg_cb = virtio_crypto_dataq_sym_callback; 506 vc_sym_req->encrypt = false; 507 508 return crypto_transfer_skcipher_request_to_engine(data_vq->engine, req); 509 } 510 511 static int virtio_crypto_skcipher_init(struct crypto_skcipher *tfm) 512 { 513 crypto_skcipher_set_reqsize(tfm, sizeof(struct virtio_crypto_sym_request)); 514 515 return 0; 516 } 517 518 static void virtio_crypto_skcipher_exit(struct crypto_skcipher *tfm) 519 { 520 struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm); 521 522 if (!ctx->vcrypto) 523 return; 524 525 virtio_crypto_alg_skcipher_close_session(ctx, 1); 526 virtio_crypto_alg_skcipher_close_session(ctx, 0); 527 virtcrypto_dev_put(ctx->vcrypto); 528 ctx->vcrypto = NULL; 529 } 530 531 int virtio_crypto_skcipher_crypt_req( 532 struct crypto_engine *engine, void *vreq) 533 { 534 struct skcipher_request *req = container_of(vreq, struct skcipher_request, base); 535 struct virtio_crypto_sym_request *vc_sym_req = 536 skcipher_request_ctx(req); 537 struct virtio_crypto_request *vc_req = &vc_sym_req->base; 538 struct data_queue *data_vq = vc_req->dataq; 539 int ret; 540 541 ret = __virtio_crypto_skcipher_do_req(vc_sym_req, req, data_vq); 542 if (ret < 0) 543 return ret; 544 545 return 0; 546 } 547 548 static void virtio_crypto_skcipher_finalize_req( 549 struct virtio_crypto_sym_request *vc_sym_req, 550 struct skcipher_request *req, 551 int err) 552 { 553 if (vc_sym_req->encrypt) 554 scatterwalk_map_and_copy(req->iv, req->dst, 555 req->cryptlen - AES_BLOCK_SIZE, 556 AES_BLOCK_SIZE, 0); 557 kfree_sensitive(vc_sym_req->iv); 558 virtcrypto_clear_request(&vc_sym_req->base); 559 560 crypto_finalize_skcipher_request(vc_sym_req->base.dataq->engine, 561 req, err); 562 } 563 564 static struct virtio_crypto_algo virtio_crypto_algs[] = { { 565 .algonum = VIRTIO_CRYPTO_CIPHER_AES_CBC, 566 .service = VIRTIO_CRYPTO_SERVICE_CIPHER, 567 .algo.base = { 568 .base.cra_name = "cbc(aes)", 569 .base.cra_driver_name = "virtio_crypto_aes_cbc", 570 .base.cra_priority = 150, 571 .base.cra_flags = CRYPTO_ALG_ASYNC | 572 CRYPTO_ALG_ALLOCATES_MEMORY, 573 .base.cra_blocksize = AES_BLOCK_SIZE, 574 .base.cra_ctxsize = sizeof(struct virtio_crypto_skcipher_ctx), 575 .base.cra_module = THIS_MODULE, 576 .init = virtio_crypto_skcipher_init, 577 .exit = virtio_crypto_skcipher_exit, 578 .setkey = virtio_crypto_skcipher_setkey, 579 .decrypt = virtio_crypto_skcipher_decrypt, 580 .encrypt = virtio_crypto_skcipher_encrypt, 581 .min_keysize = AES_MIN_KEY_SIZE, 582 .max_keysize = AES_MAX_KEY_SIZE, 583 .ivsize = AES_BLOCK_SIZE, 584 }, 585 .algo.op = { 586 .do_one_request = virtio_crypto_skcipher_crypt_req, 587 }, 588 } }; 589 590 int virtio_crypto_skcipher_algs_register(struct virtio_crypto *vcrypto) 591 { 592 int ret = 0; 593 int i = 0; 594 595 mutex_lock(&algs_lock); 596 597 for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) { 598 599 uint32_t service = virtio_crypto_algs[i].service; 600 uint32_t algonum = virtio_crypto_algs[i].algonum; 601 602 if (!virtcrypto_algo_is_supported(vcrypto, service, algonum)) 603 continue; 604 605 if (virtio_crypto_algs[i].active_devs == 0) { 606 ret = crypto_engine_register_skcipher(&virtio_crypto_algs[i].algo); 607 if (ret) 608 goto unlock; 609 } 610 611 virtio_crypto_algs[i].active_devs++; 612 dev_info(&vcrypto->vdev->dev, "Registered algo %s\n", 613 virtio_crypto_algs[i].algo.base.base.cra_name); 614 } 615 616 unlock: 617 mutex_unlock(&algs_lock); 618 return ret; 619 } 620 621 void virtio_crypto_skcipher_algs_unregister(struct virtio_crypto *vcrypto) 622 { 623 int i = 0; 624 625 mutex_lock(&algs_lock); 626 627 for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) { 628 629 uint32_t service = virtio_crypto_algs[i].service; 630 uint32_t algonum = virtio_crypto_algs[i].algonum; 631 632 if (virtio_crypto_algs[i].active_devs == 0 || 633 !virtcrypto_algo_is_supported(vcrypto, service, algonum)) 634 continue; 635 636 if (virtio_crypto_algs[i].active_devs == 1) 637 crypto_engine_unregister_skcipher(&virtio_crypto_algs[i].algo); 638 639 virtio_crypto_algs[i].active_devs--; 640 } 641 642 mutex_unlock(&algs_lock); 643 } 644