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Date: Sat, 3 Jul 2021 05:04:07 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: kernel test robot <lkp@...el.com>
Cc: Zhu Lingshan <lingshan.zhu@...el.com>, jasowang@...hat.com,
clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
kvm@...r.kernel.org
Subject: Re: [PATCH 2/3] vDPA/ifcvf: implement management netlink framework
for ifcvf
On Thu, Jul 01, 2021 at 03:04:09AM +0800, kernel test robot wrote:
> Hi Zhu,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on linus/master]
> [also build test WARNING on v5.13 next-20210630]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
>
> url: https://github.com/0day-ci/linux/commits/Zhu-Lingshan/vDPA-ifcvf-implement-management-netlink-framework/20210630-162940
> base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 007b350a58754a93ca9fe50c498cc27780171153
> config: x86_64-randconfig-a015-20210630 (attached as .config)
> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d21d5472501460933e78aead04cf59579025ba4)
> reproduce (this is a W=1 build):
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # install x86_64 cross compiling tool for clang build
> # apt-get install binutils-x86-64-linux-gnu
> # https://github.com/0day-ci/linux/commit/7ea782fbd896e1a5b3c01b29f4929773748a525f
> git remote add linux-review https://github.com/0day-ci/linux
> git fetch --no-tags linux-review Zhu-Lingshan/vDPA-ifcvf-implement-management-netlink-framework/20210630-162940
> git checkout 7ea782fbd896e1a5b3c01b29f4929773748a525f
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/vdpa/ifcvf/ifcvf_main.c:612:14: warning: variable 'adapter' is uninitialized when used here [-Wuninitialized]
> put_device(&adapter->vdpa.dev);
> ^~~~~~~
> drivers/vdpa/ifcvf/ifcvf_main.c:546:31: note: initialize the variable 'adapter' to silence this warning
> struct ifcvf_adapter *adapter;
> ^
> = NULL
> 1 warning generated.
>
Actually the problem is real and this is almost surely the wrong fix.
We need an extra label to skip using put_device when adapter was not
yet initialized.
> vim +/adapter +612 drivers/vdpa/ifcvf/ifcvf_main.c
>
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 541
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 542 static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 543 {
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 544 struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 545 struct device *dev = &pdev->dev;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 546 struct ifcvf_adapter *adapter;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 547 u32 dev_type;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 548 int ret;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 549
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 550 ifcvf_mgmt_dev = kzalloc(sizeof(struct ifcvf_vdpa_mgmt_dev), GFP_KERNEL);
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 551 if (!ifcvf_mgmt_dev) {
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 552 IFCVF_ERR(pdev, "Failed to alloc memory for the vDPA management device\n");
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 553 return -ENOMEM;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 554 }
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 555
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 556 dev_type = get_dev_type(pdev);
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 557 switch (dev_type) {
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 558 case VIRTIO_ID_NET:
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 559 ifcvf_mgmt_dev->mdev.id_table = id_table_net;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 560 break;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 561 case VIRTIO_ID_BLOCK:
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 562 ifcvf_mgmt_dev->mdev.id_table = id_table_blk;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 563 break;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 564 default:
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 565 IFCVF_ERR(pdev, "VIRTIO ID %u not supported\n", dev_type);
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 566 ret = -EOPNOTSUPP;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 567 goto err;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 568 }
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 569
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 570 ifcvf_mgmt_dev->mdev.ops = &ifcvf_vdpa_mgmt_dev_ops;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 571 ifcvf_mgmt_dev->mdev.device = dev;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 572 ifcvf_mgmt_dev->pdev = pdev;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 573
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 574 ret = pcim_enable_device(pdev);
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 575 if (ret) {
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 576 IFCVF_ERR(pdev, "Failed to enable device\n");
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 577 goto err;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 578 }
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 579
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 580 ret = pcim_iomap_regions(pdev, BIT(0) | BIT(2) | BIT(4),
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 581 IFCVF_DRIVER_NAME);
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 582 if (ret) {
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 583 IFCVF_ERR(pdev, "Failed to request MMIO region\n");
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 584 goto err;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 585 }
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 586
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 587 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 588 if (ret) {
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 589 IFCVF_ERR(pdev, "No usable DMA configuration\n");
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 590 goto err;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 591 }
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 592
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 593 ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 594 if (ret) {
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 595 IFCVF_ERR(pdev,
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 596 "Failed for adding devres for freeing irq vectors\n");
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 597 goto err;
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 598 }
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 599
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 600 pci_set_master(pdev);
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 601
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 602 ret = vdpa_mgmtdev_register(&ifcvf_mgmt_dev->mdev);
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 603 if (ret) {
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 604 IFCVF_ERR(pdev,
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 605 "Failed to initialize the management interfaces\n");
> 5a2414bc454e89 drivers/virtio/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2020-03-26 606 goto err;
> 5a2414bc454e89 drivers/virtio/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2020-03-26 607 }
> 5a2414bc454e89 drivers/virtio/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2020-03-26 608
> 5a2414bc454e89 drivers/virtio/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2020-03-26 609 return 0;
> 5a2414bc454e89 drivers/virtio/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2020-03-26 610
> 5a2414bc454e89 drivers/virtio/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2020-03-26 611 err:
> 5a2414bc454e89 drivers/virtio/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2020-03-26 @612 put_device(&adapter->vdpa.dev);
> 7ea782fbd896e1 drivers/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2021-06-30 613 kfree(ifcvf_mgmt_dev);
> 5a2414bc454e89 drivers/virtio/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2020-03-26 614 return ret;
> 5a2414bc454e89 drivers/virtio/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2020-03-26 615 }
> 5a2414bc454e89 drivers/virtio/vdpa/ifcvf/ifcvf_main.c Zhu Lingshan 2020-03-26 616
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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