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X-CSE-ConnectionGUID: 6LVYWijfQr6izOo/ASlLfg== X-CSE-MsgGUID: /7KI7izvSx+bsP+FmiD1eA== X-IronPort-AV: E=McAfee;i="6800,10657,11841"; a="87039717" X-IronPort-AV: E=Sophos;i="6.25,154,1779174000"; d="scan'208";a="87039717" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jul 2026 08:20:29 -0700 X-CSE-ConnectionGUID: yYcuukdkQQiwEhG6EldvuQ== X-CSE-MsgGUID: ziJ8bYVASYWBBZ8GiKeaPw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,154,1779174000"; d="scan'208";a="278583002" Received: from lkp-server02.sh.intel.com (HELO ea128546eb3d) ([10.239.97.151]) by fmviesa002.fm.intel.com with ESMTP; 12 Jul 2026 08:20:28 -0700 Received: from kbuild by ea128546eb3d with local (Exim 4.98.2) (envelope-from ) id 1wivyj-00000000KwZ-2gnN; Sun, 12 Jul 2026 15:20:25 +0000 Date: Sun, 12 Jul 2026 23:19:19 +0800 From: kernel test robot To: oe-kbuild@lists.linux.dev Cc: lkp@intel.com, Julia Lawall Subject: drivers/dma/loongson/loongson2-apb-cmc-dma.c:677:6-16: WARNING: Unsigned expression compared with zero: lchan -> irq < 0 Message-ID: <202607122209.WtJaZ2I7-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev CC: linux-kernel@vger.kernel.org TO: Binbin Zhou CC: Vinod Koul CC: Frank Li CC: Huacai Chen tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: dd3210c47e8d3ac6b4e9141fc68acc03b38c0ba3 commit: 1c0028e725f156ebabe68b0025f9c8e7a6170ffd dmaengine: loongson: New driver for the Loongson Multi-Channel DMA controller date: 4 months ago :::::: branch date: 2 days ago :::::: commit date: 4 months ago config: hexagon-randconfig-r051-20260709 (https://download.01.org/0day-ci/archive/20260712/202607122209.WtJaZ2I7-lkp@intel.com/config) compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project c279890c85da307abe34f10333442bbf72a60644) 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 | Fixes: 1c0028e725f1 ("dmaengine: loongson: New driver for the Loongson Multi-Channel DMA controller") | Reported-by: kernel test robot | Reported-by: Julia Lawall | Closes: https://lore.kernel.org/r/202607122209.WtJaZ2I7-lkp@intel.com/ cocci warnings: (new ones prefixed by >>) >> drivers/dma/loongson/loongson2-apb-cmc-dma.c:677:6-16: WARNING: Unsigned expression compared with zero: lchan -> irq < 0 vim +677 drivers/dma/loongson/loongson2-apb-cmc-dma.c 1c0028e725f156 Binbin Zhou 2026-03-07 601 1c0028e725f156 Binbin Zhou 2026-03-07 602 static int loongson2_cmc_dma_probe(struct platform_device *pdev) 1c0028e725f156 Binbin Zhou 2026-03-07 603 { 1c0028e725f156 Binbin Zhou 2026-03-07 604 const struct loongson2_cmc_dma_config *config; 1c0028e725f156 Binbin Zhou 2026-03-07 605 struct loongson2_cmc_dma_chan *lchan; 1c0028e725f156 Binbin Zhou 2026-03-07 606 struct loongson2_cmc_dma_dev *lddev; 1c0028e725f156 Binbin Zhou 2026-03-07 607 struct device *dev = &pdev->dev; 1c0028e725f156 Binbin Zhou 2026-03-07 608 struct dma_device *ddev; 1c0028e725f156 Binbin Zhou 2026-03-07 609 u32 nr_chans, i; 1c0028e725f156 Binbin Zhou 2026-03-07 610 int ret; 1c0028e725f156 Binbin Zhou 2026-03-07 611 1c0028e725f156 Binbin Zhou 2026-03-07 612 config = (const struct loongson2_cmc_dma_config *)device_get_match_data(dev); 1c0028e725f156 Binbin Zhou 2026-03-07 613 if (!config) 1c0028e725f156 Binbin Zhou 2026-03-07 614 return -EINVAL; 1c0028e725f156 Binbin Zhou 2026-03-07 615 1c0028e725f156 Binbin Zhou 2026-03-07 616 ret = device_property_read_u32(dev, "dma-channels", &nr_chans); 1c0028e725f156 Binbin Zhou 2026-03-07 617 if (ret || nr_chans > config->max_channels) { 1c0028e725f156 Binbin Zhou 2026-03-07 618 dev_err(dev, "missing or invalid dma-channels property\n"); 1c0028e725f156 Binbin Zhou 2026-03-07 619 nr_chans = config->max_channels; 1c0028e725f156 Binbin Zhou 2026-03-07 620 } 1c0028e725f156 Binbin Zhou 2026-03-07 621 1c0028e725f156 Binbin Zhou 2026-03-07 622 lddev = devm_kzalloc(dev, struct_size(lddev, chan, nr_chans), GFP_KERNEL); 1c0028e725f156 Binbin Zhou 2026-03-07 623 if (!lddev) 1c0028e725f156 Binbin Zhou 2026-03-07 624 return -ENOMEM; 1c0028e725f156 Binbin Zhou 2026-03-07 625 1c0028e725f156 Binbin Zhou 2026-03-07 626 lddev->base = devm_platform_ioremap_resource(pdev, 0); 1c0028e725f156 Binbin Zhou 2026-03-07 627 if (IS_ERR(lddev->base)) 1c0028e725f156 Binbin Zhou 2026-03-07 628 return PTR_ERR(lddev->base); 1c0028e725f156 Binbin Zhou 2026-03-07 629 1c0028e725f156 Binbin Zhou 2026-03-07 630 platform_set_drvdata(pdev, lddev); 1c0028e725f156 Binbin Zhou 2026-03-07 631 lddev->nr_channels = nr_chans; 1c0028e725f156 Binbin Zhou 2026-03-07 632 lddev->chan_reg_offset = config->chan_reg_offset; 1c0028e725f156 Binbin Zhou 2026-03-07 633 1c0028e725f156 Binbin Zhou 2026-03-07 634 lddev->dma_clk = devm_clk_get_optional_enabled(dev, NULL); 1c0028e725f156 Binbin Zhou 2026-03-07 635 if (IS_ERR(lddev->dma_clk)) 1c0028e725f156 Binbin Zhou 2026-03-07 636 return dev_err_probe(dev, PTR_ERR(lddev->dma_clk), "Failed to get dma clock\n"); 1c0028e725f156 Binbin Zhou 2026-03-07 637 1c0028e725f156 Binbin Zhou 2026-03-07 638 ddev = &lddev->ddev; 1c0028e725f156 Binbin Zhou 2026-03-07 639 ddev->dev = dev; 1c0028e725f156 Binbin Zhou 2026-03-07 640 1c0028e725f156 Binbin Zhou 2026-03-07 641 dma_cap_zero(ddev->cap_mask); 1c0028e725f156 Binbin Zhou 2026-03-07 642 dma_cap_set(DMA_SLAVE, ddev->cap_mask); 1c0028e725f156 Binbin Zhou 2026-03-07 643 dma_cap_set(DMA_PRIVATE, ddev->cap_mask); 1c0028e725f156 Binbin Zhou 2026-03-07 644 dma_cap_set(DMA_CYCLIC, ddev->cap_mask); 1c0028e725f156 Binbin Zhou 2026-03-07 645 1c0028e725f156 Binbin Zhou 2026-03-07 646 ddev->device_free_chan_resources = loongson2_cmc_dma_free_chan_resources; 1c0028e725f156 Binbin Zhou 2026-03-07 647 ddev->device_config = loongson2_cmc_dma_slave_config; 1c0028e725f156 Binbin Zhou 2026-03-07 648 ddev->device_prep_slave_sg = loongson2_cmc_dma_prep_slave_sg; 1c0028e725f156 Binbin Zhou 2026-03-07 649 ddev->device_prep_dma_cyclic = loongson2_cmc_dma_prep_dma_cyclic; 1c0028e725f156 Binbin Zhou 2026-03-07 650 ddev->device_issue_pending = loongson2_cmc_dma_issue_pending; 1c0028e725f156 Binbin Zhou 2026-03-07 651 ddev->device_synchronize = loongson2_cmc_dma_synchronize; 1c0028e725f156 Binbin Zhou 2026-03-07 652 ddev->device_tx_status = loongson2_cmc_dma_tx_status; 1c0028e725f156 Binbin Zhou 2026-03-07 653 ddev->device_terminate_all = loongson2_cmc_dma_terminate_all; 1c0028e725f156 Binbin Zhou 2026-03-07 654 1c0028e725f156 Binbin Zhou 2026-03-07 655 ddev->max_sg_burst = LOONSON2_CMCDMA_MAX_DATA_ITEMS; 1c0028e725f156 Binbin Zhou 2026-03-07 656 ddev->src_addr_widths = LOONGSON2_CMCDMA_BUSWIDTHS; 1c0028e725f156 Binbin Zhou 2026-03-07 657 ddev->dst_addr_widths = LOONGSON2_CMCDMA_BUSWIDTHS; 1c0028e725f156 Binbin Zhou 2026-03-07 658 ddev->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); 1c0028e725f156 Binbin Zhou 2026-03-07 659 INIT_LIST_HEAD(&ddev->channels); 1c0028e725f156 Binbin Zhou 2026-03-07 660 1c0028e725f156 Binbin Zhou 2026-03-07 661 for (i = 0; i < nr_chans; i++) { 1c0028e725f156 Binbin Zhou 2026-03-07 662 lchan = &lddev->chan[i]; 1c0028e725f156 Binbin Zhou 2026-03-07 663 1c0028e725f156 Binbin Zhou 2026-03-07 664 lchan->id = i; 1c0028e725f156 Binbin Zhou 2026-03-07 665 lchan->vchan.desc_free = loongson2_cmc_dma_desc_free; 1c0028e725f156 Binbin Zhou 2026-03-07 666 vchan_init(&lchan->vchan, ddev); 1c0028e725f156 Binbin Zhou 2026-03-07 667 } 1c0028e725f156 Binbin Zhou 2026-03-07 668 1c0028e725f156 Binbin Zhou 2026-03-07 669 ret = dmaenginem_async_device_register(ddev); 1c0028e725f156 Binbin Zhou 2026-03-07 670 if (ret) 1c0028e725f156 Binbin Zhou 2026-03-07 671 return dev_err_probe(dev, ret, "Failed to register DMA engine device.\n"); 1c0028e725f156 Binbin Zhou 2026-03-07 672 1c0028e725f156 Binbin Zhou 2026-03-07 673 for (i = 0; i < nr_chans; i++) { 1c0028e725f156 Binbin Zhou 2026-03-07 674 lchan = &lddev->chan[i]; 1c0028e725f156 Binbin Zhou 2026-03-07 675 1c0028e725f156 Binbin Zhou 2026-03-07 676 lchan->irq = platform_get_irq(pdev, i); 1c0028e725f156 Binbin Zhou 2026-03-07 @677 if (lchan->irq < 0) 1c0028e725f156 Binbin Zhou 2026-03-07 678 return lchan->irq; 1c0028e725f156 Binbin Zhou 2026-03-07 679 1c0028e725f156 Binbin Zhou 2026-03-07 680 ret = devm_request_irq(dev, lchan->irq, loongson2_cmc_dma_chan_irq, IRQF_SHARED, 1c0028e725f156 Binbin Zhou 2026-03-07 681 dev_name(chan2dev(lchan)), lchan); 1c0028e725f156 Binbin Zhou 2026-03-07 682 if (ret) 1c0028e725f156 Binbin Zhou 2026-03-07 683 return ret; 1c0028e725f156 Binbin Zhou 2026-03-07 684 } 1c0028e725f156 Binbin Zhou 2026-03-07 685 1c0028e725f156 Binbin Zhou 2026-03-07 686 ret = loongson2_cmc_dma_acpi_controller_register(lddev); 1c0028e725f156 Binbin Zhou 2026-03-07 687 if (ret) 1c0028e725f156 Binbin Zhou 2026-03-07 688 return dev_err_probe(dev, ret, "Failed to register dma controller with ACPI.\n"); 1c0028e725f156 Binbin Zhou 2026-03-07 689 1c0028e725f156 Binbin Zhou 2026-03-07 690 ret = loongson2_cmc_dma_of_controller_register(lddev); 1c0028e725f156 Binbin Zhou 2026-03-07 691 if (ret) 1c0028e725f156 Binbin Zhou 2026-03-07 692 return dev_err_probe(dev, ret, "Failed to register dma controller with FDT.\n"); 1c0028e725f156 Binbin Zhou 2026-03-07 693 1c0028e725f156 Binbin Zhou 2026-03-07 694 dev_info(dev, "Loongson-2 Multi-Channel DMA Controller registered successfully.\n"); 1c0028e725f156 Binbin Zhou 2026-03-07 695 1c0028e725f156 Binbin Zhou 2026-03-07 696 return 0; 1c0028e725f156 Binbin Zhou 2026-03-07 697 } 1c0028e725f156 Binbin Zhou 2026-03-07 698 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki