Re: [PATCH v8] usb: dwc3: debugfs: Prevent any register access when devices is runtime suspended

[kernel test robot <lkp@intel.com>]

Hi Udipto,

kernel test robot noticed the following build warnings:

[auto build test WARNING on usb/usb-testing]
[also build test WARNING on usb/usb-next usb/usb-linus driver-core/driver-core-testing driver-core/driver-core-next driver-core/driver-core-linus johan-usb-serial/usb-next johan-usb-serial/usb-linus linus/master v6.4-rc1 next-20230509]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Udipto-Goswami/usb-dwc3-debugfs-Prevent-any-register-access-when-devices-is-runtime-suspended/20230504-125225
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
patch link:    https://lore.kernel.org/r/20230504045052.22347-1-quic_ugoswami%40quicinc.com
patch subject: [PATCH v8] usb: dwc3: debugfs: Prevent any register access when devices is runtime suspended
config: hexagon-randconfig-r024-20230509 (https://download.01.org/0day-ci/archive/20230510/202305100533.3s1xdH64-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project b0fb98227c90adf2536c9ad644a74d5e92961111)
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
        # https://github.com/intel-lab-lkp/linux/commit/1c53edaeee33380f0fc3e0d262829ffaa66f45e1
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Udipto-Goswami/usb-dwc3-debugfs-Prevent-any-register-access-when-devices-is-runtime-suspended/20230504-125225
        git checkout 1c53edaeee33380f0fc3e0d262829ffaa66f45e1
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/usb/dwc3/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305100533.3s1xdH64-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/usb/dwc3/debugfs.c:23:
   In file included from drivers/usb/dwc3/core.h:20:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/usb/dwc3/debugfs.c:23:
   In file included from drivers/usb/dwc3/core.h:20:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/usb/dwc3/debugfs.c:23:
   In file included from drivers/usb/dwc3/core.h:20:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
>> drivers/usb/dwc3/debugfs.c:720:3: warning: misleading indentation; statement is not part of the previous 'if' [-Wmisleading-indentation]
                   return ret;
                   ^
   drivers/usb/dwc3/debugfs.c:718:2: note: previous statement is here
           if (ret < 0)
           ^
   7 warnings generated.


vim +/if +720 drivers/usb/dwc3/debugfs.c

   707	
   708	static int dwc3_rx_fifo_size_show(struct seq_file *s, void *unused)
   709	{
   710		struct dwc3_ep		*dep = s->private;
   711		struct dwc3		*dwc = dep->dwc;
   712		unsigned long		flags;
   713		u32			mdwidth;
   714		u32			val;
   715		int			ret;
   716	
   717		ret = pm_runtime_resume_and_get(dwc->dev);
   718		if (ret < 0)
   719			pm_runtime_put_sync(dwc->dev);
 > 720			return ret;
   721	
   722		spin_lock_irqsave(&dwc->lock, flags);
   723		val = dwc3_core_fifo_space(dep, DWC3_RXFIFO);
   724	
   725		/* Convert to bytes */
   726		mdwidth = dwc3_mdwidth(dwc);
   727	
   728		val *= mdwidth;
   729		val >>= 3;
   730		seq_printf(s, "%u\n", val);
   731		spin_unlock_irqrestore(&dwc->lock, flags);
   732	
   733		pm_runtime_put_sync(dwc->dev);
   734		return 0;
   735	}
   736	

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