Re: [PATCH v3 2/7] mfd: add base driver for qnap-mcu devices

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Hi Heiko,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20240801]
[also build test WARNING on v6.11-rc1]
[cannot apply to groeck-staging/hwmon-next lee-leds/for-leds-next lee-mfd/for-mfd-next lee-mfd/for-mfd-fixes linus/master v6.11-rc1 v6.10 v6.10-rc7]
[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/Heiko-Stuebner/dt-bindings-mfd-add-binding-for-qnap-ts433-mcu-devices/20240802-103948
base:   next-20240801
patch link:    https://lore.kernel.org/r/20240731212430.2677900-3-heiko%40sntech.de
patch subject: [PATCH v3 2/7] mfd: add base driver for qnap-mcu devices
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20240804/202408040850.uHsR1c30-lkp@xxxxxxxxx/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 423aec6573df4424f90555468128e17073ddc69e)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240804/202408040850.uHsR1c30-lkp@xxxxxxxxx/reproduce)

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 <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408040850.uHsR1c30-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   In file included from drivers/mfd/qnap-mcu.c:17:
   In file included from include/linux/serdev.h:10:
   In file included from include/linux/iopoll.h:14:
   In file included from include/linux/io.h:14:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     548 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     561 |         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'
      37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
         |                                                   ^
   In file included from drivers/mfd/qnap-mcu.c:17:
   In file included from include/linux/serdev.h:10:
   In file included from include/linux/iopoll.h:14:
   In file included from include/linux/io.h:14:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     574 |         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'
      35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
         |                                                   ^
   In file included from drivers/mfd/qnap-mcu.c:17:
   In file included from include/linux/serdev.h:10:
   In file included from include/linux/iopoll.h:14:
   In file included from include/linux/io.h:14:
   In file included from arch/hexagon/include/asm/io.h:328:
   include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     585 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     595 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     605 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
>> drivers/mfd/qnap-mcu.c:109:5: warning: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
     108 |                 dev_warn(dev, "received %lu bytes, we were not waiting for\n",
         |                                         ~~~
         |                                         %zu
     109 |                          size);
         |                          ^~~~
   include/linux/dev_printk.h:156:70: note: expanded from macro 'dev_warn'
     156 |         dev_printk_index_wrap(_dev_warn, KERN_WARNING, dev, dev_fmt(fmt), ##__VA_ARGS__)
         |                                                                     ~~~     ^~~~~~~~~~~
   include/linux/dev_printk.h:110:23: note: expanded from macro 'dev_printk_index_wrap'
     110 |                 _p_func(dev, fmt, ##__VA_ARGS__);                       \
         |                              ~~~    ^~~~~~~~~~~
   7 warnings generated.


vim +109 drivers/mfd/qnap-mcu.c

    96	
    97	static size_t qnap_mcu_receive_buf(struct serdev_device *serdev,
    98					   const u8 *buf, size_t size)
    99	{
   100		struct device *dev = &serdev->dev;
   101		struct qnap_mcu *mcu = dev_get_drvdata(dev);
   102		struct qnap_mcu_reply *reply = mcu->reply;
   103		const u8 *src = buf;
   104		const u8 *end = buf + size;
   105	
   106		mutex_lock(&mcu->reply_lock);
   107		if (!reply) {
   108			dev_warn(dev, "received %lu bytes, we were not waiting for\n",
 > 109				 size);
   110			mutex_unlock(&mcu->reply_lock);
   111			return size;
   112		}
   113	
   114		while (src < end) {
   115			reply->data[reply->received] = *src++;
   116			reply->received++;
   117	
   118			if (reply->received == reply->length) {
   119				complete(&reply->done);
   120				mutex_unlock(&mcu->reply_lock);
   121	
   122				/*
   123				 * We report the consumed number of bytes. If there
   124				 * are still bytes remaining (though there shouldn't)
   125				 * the serdev layer will re-execute this handler with
   126				 * the remainder of the Rx bytes.
   127				 */
   128				return src - buf;
   129			}
   130		}
   131	
   132		/*
   133		 * The only way to get out of the above loop and end up here
   134		 * is through consuming all of the supplied data, so here we
   135		 * report that we processed it all.
   136		 */
   137		mutex_unlock(&mcu->reply_lock);
   138		return size;
   139	}
   140	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki




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