Re: [PATCH v7 5/6] media: starfive: camss: Add ISP driver

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

Hi Jack,

kernel test robot noticed the following build warnings:

[auto build test WARNING on media-tree/master]
[also build test WARNING on robh/for-next linus/master v6.4-rc7 next-20230621]
[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/Jack-Zhu/media-dt-bindings-Add-JH7110-Camera-Subsystem/20230619-193105
base:   git://linuxtv.org/media_tree.git master
patch link:    https://lore.kernel.org/r/20230619112838.19797-6-jack.zhu%40starfivetech.com
patch subject: [PATCH v7 5/6] media: starfive: camss: Add ISP driver
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20230622/202306221112.MnLtMzRo-lkp@intel.com/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project.git 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce: (https://download.01.org/0day-ci/archive/20230622/202306221112.MnLtMzRo-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306221112.MnLtMzRo-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/media/platform/starfive/camss/stf_camss.c:173:13: warning: variable 'pad_num' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           } else if (port == STF_PORT_DVP) {
                      ^~~~~~~~~~~~~~~~~~~~
   drivers/media/platform/starfive/camss/stf_camss.c:178:18: note: uninitialized use occurs here
           for (i = 0; i < pad_num; ++i) {
                           ^~~~~~~
   drivers/media/platform/starfive/camss/stf_camss.c:173:9: note: remove the 'if' if its condition is always true
           } else if (port == STF_PORT_DVP) {
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/media/platform/starfive/camss/stf_camss.c:168:25: note: initialize the variable 'pad_num' to silence this warning
           unsigned int i, pad_num;
                                  ^
                                   = 0
   1 warning generated.
--
>> drivers/media/platform/starfive/camss/stf_isp.c:113:13: warning: variable 'formats' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           } else if (pad == STF_ISP_PAD_SRC) {
                      ^~~~~~~~~~~~~~~~~~~~~~
   drivers/media/platform/starfive/camss/stf_isp.c:127:18: note: uninitialized use occurs here
           for (i = 0; i < formats->nfmts; i++) {
                           ^~~~~~~
   drivers/media/platform/starfive/camss/stf_isp.c:113:9: note: remove the 'if' if its condition is always true
           } else if (pad == STF_ISP_PAD_SRC) {
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/media/platform/starfive/camss/stf_isp.c:105:40: note: initialize the variable 'formats' to silence this warning
           const struct isp_format_table *formats;
                                                 ^
                                                  = NULL
   1 warning generated.


vim +173 drivers/media/platform/starfive/camss/stf_camss.c

   156	
   157	static int stfcamss_subdev_notifier_bound(struct v4l2_async_notifier *async,
   158						  struct v4l2_subdev *subdev,
   159						  struct v4l2_async_subdev *asd)
   160	{
   161		struct stfcamss *stfcamss =
   162			container_of(async, struct stfcamss, notifier);
   163		struct stfcamss_async_subdev *csd =
   164			container_of(asd, struct stfcamss_async_subdev, asd);
   165		enum stf_port_num port = csd->port;
   166		struct stf_isp_dev *isp_dev = &stfcamss->isp_dev;
   167		struct media_pad *pad[STF_PADS_NUM];
   168		unsigned int i, pad_num;
   169	
   170		if (port == STF_PORT_CSI2RX) {
   171			pad[0] = &isp_dev->pads[STF_PAD_SINK];
   172			pad_num = 1;
 > 173		} else if (port == STF_PORT_DVP) {
   174			dev_err(stfcamss->dev, "Not support DVP sensor\n");
   175			return -EPERM;
   176		}
   177	
   178		for (i = 0; i < pad_num; ++i) {
   179			int ret;
   180	
   181			ret = v4l2_create_fwnode_links_to_pad(subdev, pad[i], 0);
   182			if (ret < 0)
   183				return ret;
   184		}
   185	
   186		return 0;
   187	}
   188	

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