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charset=us-ascii Content-Disposition: inline BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev CC: linux-kernel@vger.kernel.org TO: Robin Murphy CC: Joerg Roedel CC: Jason Gunthorpe CC: Jerry Snitselaar tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 715ca9dd687f89ddaac8ec8ccb3b5e5a30311a99 commit: e7080665c977ea1aafb8547a9c7bd08b199311d6 iommu: Clean up open-coded ownership checks date: 11 months ago :::::: branch date: 8 hours ago :::::: commit date: 11 months ago config: arm-randconfig-r072-20241016 (https://download.01.org/0day-ci/archive/20241020/202410201535.n0b34Sb1-lkp@intel.com/config) compiler: arm-linux-gnueabi-gcc (GCC) 14.1.0 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 | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202410201535.n0b34Sb1-lkp@intel.com/ smatch warnings: drivers/iommu/mtk_iommu_v1.c:487 mtk_iommu_v1_probe_device() error: we previously assumed 'fwspec' could be null (see line 465) vim +/fwspec +487 drivers/iommu/mtk_iommu_v1.c b17336c55d8928 Honghui Zhang 2016-06-08 451 ad9b10e533f6fb Yong Wu 2022-05-03 452 static struct iommu_device *mtk_iommu_v1_probe_device(struct device *dev) b17336c55d8928 Honghui Zhang 2016-06-08 453 { a9bf2eec5a6fc0 Joerg Roedel 2018-11-29 454 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); b17336c55d8928 Honghui Zhang 2016-06-08 455 struct of_phandle_args iommu_spec; ad9b10e533f6fb Yong Wu 2022-05-03 456 struct mtk_iommu_v1_data *data; 635319a4a7444c Yong Wu 2022-01-17 457 int err, idx = 0, larbid, larbidx; 635319a4a7444c Yong Wu 2022-01-17 458 struct device_link *link; 635319a4a7444c Yong Wu 2022-01-17 459 struct device *larbdev; b17336c55d8928 Honghui Zhang 2016-06-08 460 822a2ed8c606ca Yong Wu 2022-01-17 461 /* 822a2ed8c606ca Yong Wu 2022-01-17 462 * In the deferred case, free the existed fwspec. 822a2ed8c606ca Yong Wu 2022-01-17 463 * Always initialize the fwspec internally. 822a2ed8c606ca Yong Wu 2022-01-17 464 */ 822a2ed8c606ca Yong Wu 2022-01-17 @465 if (fwspec) { 822a2ed8c606ca Yong Wu 2022-01-17 466 iommu_fwspec_free(dev); 822a2ed8c606ca Yong Wu 2022-01-17 467 fwspec = dev_iommu_fwspec_get(dev); 822a2ed8c606ca Yong Wu 2022-01-17 468 } 822a2ed8c606ca Yong Wu 2022-01-17 469 f90a9a85fb946e Yong Wu 2021-04-12 470 while (!of_parse_phandle_with_args(dev->of_node, "iommus", f90a9a85fb946e Yong Wu 2021-04-12 471 "#iommu-cells", f90a9a85fb946e Yong Wu 2021-04-12 472 idx, &iommu_spec)) { b17336c55d8928 Honghui Zhang 2016-06-08 473 ad9b10e533f6fb Yong Wu 2022-05-03 474 err = mtk_iommu_v1_create_mapping(dev, &iommu_spec); f90a9a85fb946e Yong Wu 2021-04-12 475 of_node_put(iommu_spec.np); f90a9a85fb946e Yong Wu 2021-04-12 476 if (err) f90a9a85fb946e Yong Wu 2021-04-12 477 return ERR_PTR(err); da5d2748e4a451 Joerg Roedel 2019-01-23 478 da5d2748e4a451 Joerg Roedel 2019-01-23 479 /* dev->iommu_fwspec might have changed */ da5d2748e4a451 Joerg Roedel 2019-01-23 480 fwspec = dev_iommu_fwspec_get(dev); f90a9a85fb946e Yong Wu 2021-04-12 481 idx++; b17336c55d8928 Honghui Zhang 2016-06-08 482 } b17336c55d8928 Honghui Zhang 2016-06-08 483 57dbf81f50c82a Joerg Roedel 2020-04-29 484 data = dev_iommu_priv_get(dev); b17336c55d8928 Honghui Zhang 2016-06-08 485 635319a4a7444c Yong Wu 2022-01-17 486 /* Link the consumer device with the smi-larb device(supplier) */ 635319a4a7444c Yong Wu 2022-01-17 @487 larbid = mt2701_m4u_to_larb(fwspec->ids[0]); de78657e16f414 Miles Chen 2022-05-05 488 if (larbid >= MT2701_LARB_NR_MAX) de78657e16f414 Miles Chen 2022-05-05 489 return ERR_PTR(-EINVAL); de78657e16f414 Miles Chen 2022-05-05 490 635319a4a7444c Yong Wu 2022-01-17 491 for (idx = 1; idx < fwspec->num_ids; idx++) { 635319a4a7444c Yong Wu 2022-01-17 492 larbidx = mt2701_m4u_to_larb(fwspec->ids[idx]); 635319a4a7444c Yong Wu 2022-01-17 493 if (larbid != larbidx) { 635319a4a7444c Yong Wu 2022-01-17 494 dev_err(dev, "Can only use one larb. Fail@larb%d-%d.\n", 635319a4a7444c Yong Wu 2022-01-17 495 larbid, larbidx); 635319a4a7444c Yong Wu 2022-01-17 496 return ERR_PTR(-EINVAL); 635319a4a7444c Yong Wu 2022-01-17 497 } 635319a4a7444c Yong Wu 2022-01-17 498 } 635319a4a7444c Yong Wu 2022-01-17 499 635319a4a7444c Yong Wu 2022-01-17 500 larbdev = data->larb_imu[larbid].dev; de78657e16f414 Miles Chen 2022-05-05 501 if (!larbdev) de78657e16f414 Miles Chen 2022-05-05 502 return ERR_PTR(-EINVAL); de78657e16f414 Miles Chen 2022-05-05 503 635319a4a7444c Yong Wu 2022-01-17 504 link = device_link_add(dev, larbdev, 635319a4a7444c Yong Wu 2022-01-17 505 DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS); 635319a4a7444c Yong Wu 2022-01-17 506 if (!link) 635319a4a7444c Yong Wu 2022-01-17 507 dev_err(dev, "Unable to link %s\n", dev_name(larbdev)); 635319a4a7444c Yong Wu 2022-01-17 508 57dbf81f50c82a Joerg Roedel 2020-04-29 509 return &data->iommu; 57dbf81f50c82a Joerg Roedel 2020-04-29 510 } 57dbf81f50c82a Joerg Roedel 2020-04-29 511 :::::: The code at line 487 was first introduced by commit :::::: 635319a4a7444ca97124d781cd96deb277ff4d40 media: iommu/mediatek: Add device_link between the consumer and the larb devices :::::: TO: Yong Wu :::::: CC: Mauro Carvalho Chehab -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki