Hi Chiqijun, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on pci/next] [also build test WARNING on v5.12-rc2 next-20210312] [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/Chiqijun/PCI-Add-reset-quirk-for... base: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next config: sparc-randconfig-s031-20210313 (attached as .config) compiler: sparc64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-262-g5e674421-dirty # https://github.com/0day-ci/linux/commit/2ee50cef940514cc4b80bf8d550cb4f28... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Chiqijun/PCI-Add-reset-quirk-for-Huawei-Intelligent-NIC-virtual-function/20210313-152632 git checkout 2ee50cef940514cc4b80bf8d550cb4f28e257d7a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=sparc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" drivers/pci/quirks.c:2287:57: sparse: sparse: restricted pci_power_t degrades to integer drivers/pci/quirks.c:3938:15: sparse: sparse: cast to restricted __be32 drivers/pci/quirks.c:3948:15: sparse: sparse: cast to restricted __be32 drivers/pci/quirks.c:3950:16: sparse: expected unsigned int [usertype] l drivers/pci/quirks.c:3950:16: sparse: got restricted __be32 [usertype] drivers/pci/quirks.c:3965:23: sparse: sparse: cast to restricted __be32 drivers/pci/quirks.c:3971:15: sparse: sparse: cast to restricted __be32 vim +3950 drivers/pci/quirks.c 3922 3923 /* Device-specific reset method for Huawei Intelligent NIC virtual functions */ 3924 static int reset_hinic_vf_dev(struct pci_dev *pdev, int probe) 3925 { 3926 unsigned long timeout; 3927 void __iomem *bar; 3928 u32 val; 3929 3930 if (probe) 3931 return 0; 3932 3933 bar = pci_iomap(pdev, 0, 0); 3934 if (!bar) 3935 return -ENOTTY; 3936 3937 /* Get and check firmware capabilities. */ 3938 val = be32_to_cpu(readl(bar + HINIC_VF_FLR_TYPE)); 3939 if (!(val & (1UL << HINIC_VF_FLR_CAP_BIT_SHIFT))) { 3940 pci_iounmap(pdev, bar); 3941 return -ENOTTY; 3942 } 3943 3944 /* 3945 * Set the processing bit for the start of FLR, which will be cleared 3946 * by the firmware after FLR is completed. 3947 */ 3948 val = be32_to_cpu(readl(bar + HINIC_VF_OP)); 3949 val = val | (1UL << HINIC_VF_FLR_PROC_BIT_SHIFT); 3951 3952 /* Perform the actual device function reset */ 3953 pcie_flr(pdev); 3954 3955 /* 3956 * The device must learn BDF after FLR in order to respond to BAR's 3957 * read request, therefore, we issue a configure write request to let 3958 * the device capture BDF. 3959 */ 3960 pci_write_config_word(pdev, PCI_VENDOR_ID, 0); 3961 3962 /* Waiting for device reset complete */ 3963 timeout = jiffies + msecs_to_jiffies(HINIC_OPERATION_TIMEOUT); 3964 do { 3965 val = be32_to_cpu(readl(bar + HINIC_VF_OP)); 3966 if (!(val & (1UL << HINIC_VF_FLR_PROC_BIT_SHIFT))) 3967 goto reset_complete; 3968 msleep(20); 3969 } while (time_before(jiffies, timeout)); 3970 3971 val = be32_to_cpu(readl(bar + HINIC_VF_OP)); 3972 if (!(val & (1UL << HINIC_VF_FLR_PROC_BIT_SHIFT))) 3973 goto reset_complete; 3974 3975 pci_warn(pdev, "Reset dev timeout, flr ack reg: %#010x\n", val); 3976 3977 reset_complete: 3978 pci_iounmap(pdev, bar); 3979 3980 return 0; 3981 } 3982 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org