tree: https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master head: 5c324a2ffa06f8b6fda59a77c6807acb9f45cfee commit: 9744fec95f0674fbf67b12c42c3784dc299dc904 [45/63] crypto: inside-secure - remove request list to improve performance config: powerpc-allmodconfig (attached as .config) compiler: powerpc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 9744fec95f0674fbf67b12c42c3784dc299dc904 # save the attached .config to linux build tree GCC_VERSION=7.2.0 make.cross ARCH=powerpc Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/crypto/inside-secure/safexcel_cipher.c: In function 'safexcel_send_req': >> drivers/crypto/inside-secure/safexcel_cipher.c:475:2: warning: 'first_rdesc' may be used uninitialized in this function [-Wmaybe-uninitialized] safexcel_rdr_req_set(priv, ring, first_rdesc, base); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/first_rdesc +475 drivers/crypto/inside-secure/safexcel_cipher.c 373 374 static int safexcel_send_req(struct crypto_async_request *base, int ring, 375 struct safexcel_cipher_req *sreq, 376 struct scatterlist *src, struct scatterlist *dst, 377 unsigned int cryptlen, unsigned int assoclen, 378 unsigned int digestsize, u8 *iv, int *commands, 379 int *results) 380 { 381 struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(base->tfm); 382 struct safexcel_crypto_priv *priv = ctx->priv; 383 struct safexcel_command_desc *cdesc; 384 struct safexcel_result_desc *rdesc, *first_rdesc; 385 struct scatterlist *sg; 386 unsigned int totlen = cryptlen + assoclen; 387 int nr_src, nr_dst, n_cdesc = 0, n_rdesc = 0, queued = totlen; 388 int i, ret = 0; 389 390 if (src == dst) { 391 nr_src = dma_map_sg(priv->dev, src, 392 sg_nents_for_len(src, totlen), 393 DMA_BIDIRECTIONAL); 394 nr_dst = nr_src; 395 if (!nr_src) 396 return -EINVAL; 397 } else { 398 nr_src = dma_map_sg(priv->dev, src, 399 sg_nents_for_len(src, totlen), 400 DMA_TO_DEVICE); 401 if (!nr_src) 402 return -EINVAL; 403 404 nr_dst = dma_map_sg(priv->dev, dst, 405 sg_nents_for_len(dst, totlen), 406 DMA_FROM_DEVICE); 407 if (!nr_dst) { 408 dma_unmap_sg(priv->dev, src, 409 sg_nents_for_len(src, totlen), 410 DMA_TO_DEVICE); 411 return -EINVAL; 412 } 413 } 414 415 memcpy(ctx->base.ctxr->data, ctx->key, ctx->key_len); 416 417 if (ctx->aead) { 418 memcpy(ctx->base.ctxr->data + ctx->key_len / sizeof(u32), 419 ctx->ipad, ctx->state_sz); 420 memcpy(ctx->base.ctxr->data + (ctx->key_len + ctx->state_sz) / sizeof(u32), 421 ctx->opad, ctx->state_sz); 422 } 423 424 /* command descriptors */ 425 for_each_sg(src, sg, nr_src, i) { 426 int len = sg_dma_len(sg); 427 428 /* Do not overflow the request */ 429 if (queued - len < 0) 430 len = queued; 431 432 cdesc = safexcel_add_cdesc(priv, ring, !n_cdesc, !(queued - len), 433 sg_dma_address(sg), len, totlen, 434 ctx->base.ctxr_dma); 435 if (IS_ERR(cdesc)) { 436 /* No space left in the command descriptor ring */ 437 ret = PTR_ERR(cdesc); 438 goto cdesc_rollback; 439 } 440 n_cdesc++; 441 442 if (n_cdesc == 1) { 443 safexcel_context_control(ctx, base, sreq, cdesc); 444 if (ctx->aead) 445 safexcel_aead_token(ctx, iv, cdesc, 446 sreq->direction, cryptlen, 447 assoclen, digestsize); 448 else 449 safexcel_skcipher_token(ctx, iv, cdesc, 450 cryptlen); 451 } 452 453 queued -= len; 454 if (!queued) 455 break; 456 } 457 458 /* result descriptors */ 459 for_each_sg(dst, sg, nr_dst, i) { 460 bool first = !i, last = (i == nr_dst - 1); 461 u32 len = sg_dma_len(sg); 462 463 rdesc = safexcel_add_rdesc(priv, ring, first, last, 464 sg_dma_address(sg), len); 465 if (IS_ERR(rdesc)) { 466 /* No space left in the result descriptor ring */ 467 ret = PTR_ERR(rdesc); 468 goto rdesc_rollback; 469 } 470 if (first) 471 first_rdesc = rdesc; 472 n_rdesc++; 473 } 474 > 475 safexcel_rdr_req_set(priv, ring, first_rdesc, base); 476 477 *commands = n_cdesc; 478 *results = n_rdesc; 479 return 0; 480 481 rdesc_rollback: 482 for (i = 0; i < n_rdesc; i++) 483 safexcel_ring_rollback_wptr(priv, &priv->ring[ring].rdr); 484 cdesc_rollback: 485 for (i = 0; i < n_cdesc; i++) 486 safexcel_ring_rollback_wptr(priv, &priv->ring[ring].cdr); 487 488 if (src == dst) { 489 dma_unmap_sg(priv->dev, src, 490 sg_nents_for_len(src, totlen), 491 DMA_BIDIRECTIONAL); 492 } else { 493 dma_unmap_sg(priv->dev, src, 494 sg_nents_for_len(src, totlen), 495 DMA_TO_DEVICE); 496 dma_unmap_sg(priv->dev, dst, 497 sg_nents_for_len(dst, totlen), 498 DMA_FROM_DEVICE); 499 } 500 501 return ret; 502 } 503 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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