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Date: Fri, 19 Jan 2024 09:37:26 +0100 (CET)
From: Julia Lawall <julia.lawall@...ia.fr>
To: Tom Zanussi <tom.zanussi@...ux.intel.com>,
Herbert Xu <herbert@...dor.apana.org.au>, linux-kernel@...r.kernel.org
cc: oe-kbuild-all@...ts.linux.dev
Subject: drivers/crypto/intel/keembay/ocs-aes.c:1476:49-50: WARNING opportunity
for min() (fwd)
Please see the last line of the code extract.
---------- Forwarded message ----------
Date: Fri, 19 Jan 2024 10:52:40 +0800
From: kernel test robot <lkp@...el.com>
To: oe-kbuild@...ts.linux.dev
Cc: lkp@...el.com, Julia Lawall <julia.lawall@...ia.fr>
Subject: drivers/crypto/intel/keembay/ocs-aes.c:1476:49-50: WARNING opportunity
for min()
BCC: lkp@...el.com
CC: oe-kbuild-all@...ts.linux.dev
CC: linux-kernel@...r.kernel.org
TO: Tom Zanussi <tom.zanussi@...ux.intel.com>
CC: Herbert Xu <herbert@...dor.apana.org.au>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 0f289bdd4102fc870c8b97652c57d41952040d70
commit: fbf31dd599875cb132d764cf4d05d7985e332c05 crypto: keembay - Move driver to drivers/crypto/intel/keembay
date: 10 months ago
:::::: branch date: 85 minutes ago
:::::: commit date: 10 months ago
config: hexagon-randconfig-r061-20240117 (https://download.01.org/0day-ci/archive/20240119/202401191031.nqVcuyDA-lkp@intel.com/config)
compiler: clang version 18.0.0git (https://github.com/llvm/llvm-project 9bde5becb44ea071f5e1fa1f5d4071dc8788b18c)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Reported-by: Julia Lawall <julia.lawall@...ia.fr>
| Closes: https://lore.kernel.org/r/202401191031.nqVcuyDA-lkp@intel.com/
cocci warnings: (new ones prefixed by >>)
>> drivers/crypto/intel/keembay/ocs-aes.c:1476:49-50: WARNING opportunity for min()
vim +1476 drivers/crypto/intel/keembay/ocs-aes.c
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1400
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1401 /**
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1402 * ocs_create_linked_list_from_sg() - Create OCS DMA linked list from SG list.
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1403 * @aes_dev: The OCS AES device the list will be created for.
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1404 * @sg: The SG list OCS DMA linked list will be created from. When
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1405 * passed to this function, @sg must have been already mapped
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1406 * with dma_map_sg().
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1407 * @sg_dma_count: The number of DMA-mapped entries in @sg. This must be the
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1408 * value returned by dma_map_sg() when @sg was mapped.
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1409 * @dll_desc: The OCS DMA dma_list to use to store information about the
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1410 * created linked list.
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1411 * @data_size: The size of the data (from the SG list) to be mapped into the
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1412 * OCS DMA linked list.
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1413 * @data_offset: The offset (within the SG list) of the data to be mapped.
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1414 *
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1415 * Return: 0 on success, negative error code otherwise.
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1416 */
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1417 int ocs_create_linked_list_from_sg(const struct ocs_aes_dev *aes_dev,
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1418 struct scatterlist *sg,
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1419 int sg_dma_count,
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1420 struct ocs_dll_desc *dll_desc,
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1421 size_t data_size, size_t data_offset)
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1422 {
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1423 struct ocs_dma_linked_list *ll = NULL;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1424 struct scatterlist *sg_tmp;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1425 unsigned int tmp;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1426 int dma_nents;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1427 int i;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1428
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1429 if (!dll_desc || !sg || !aes_dev)
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1430 return -EINVAL;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1431
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1432 /* Default values for when no ddl_desc is created. */
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1433 dll_desc->vaddr = NULL;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1434 dll_desc->dma_addr = DMA_MAPPING_ERROR;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1435 dll_desc->size = 0;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1436
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1437 if (data_size == 0)
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1438 return 0;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1439
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1440 /* Loop over sg_list until we reach entry at specified offset. */
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1441 while (data_offset >= sg_dma_len(sg)) {
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1442 data_offset -= sg_dma_len(sg);
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1443 sg_dma_count--;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1444 sg = sg_next(sg);
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1445 /* If we reach the end of the list, offset was invalid. */
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1446 if (!sg || sg_dma_count == 0)
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1447 return -EINVAL;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1448 }
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1449
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1450 /* Compute number of DMA-mapped SG entries to add into OCS DMA list. */
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1451 dma_nents = 0;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1452 tmp = 0;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1453 sg_tmp = sg;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1454 while (tmp < data_offset + data_size) {
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1455 /* If we reach the end of the list, data_size was invalid. */
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1456 if (!sg_tmp)
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1457 return -EINVAL;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1458 tmp += sg_dma_len(sg_tmp);
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1459 dma_nents++;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1460 sg_tmp = sg_next(sg_tmp);
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1461 }
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1462 if (dma_nents > sg_dma_count)
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1463 return -EINVAL;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1464
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1465 /* Allocate the DMA list, one entry for each SG entry. */
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1466 dll_desc->size = sizeof(struct ocs_dma_linked_list) * dma_nents;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1467 dll_desc->vaddr = dma_alloc_coherent(aes_dev->dev, dll_desc->size,
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1468 &dll_desc->dma_addr, GFP_KERNEL);
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1469 if (!dll_desc->vaddr)
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1470 return -ENOMEM;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1471
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1472 /* Populate DMA linked list entries. */
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1473 ll = dll_desc->vaddr;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1474 for (i = 0; i < dma_nents; i++, sg = sg_next(sg)) {
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 1475 ll[i].src_addr = sg_dma_address(sg) + data_offset;
88574332451380 drivers/crypto/keembay/ocs-aes.c Mike Healy 2020-11-26 @1476 ll[i].src_len = (sg_dma_len(sg) - data_offset) < data_size ?
:::::: The code at line 1476 was first introduced by commit
:::::: 88574332451380f4b51f6ca88ab9810e714bfb9b crypto: keembay - Add support for Keem Bay OCS AES/SM4
:::::: TO: Mike Healy <mikex.healy@...el.com>
:::::: CC: Herbert Xu <herbert@...dor.apana.org.au>
--
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