Re: [PATCH v9 15/15] media: vim2m-audio: add virtual driver for audio memory to memory

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

Hi Shengjiu,

kernel test robot noticed the following build warnings:

[auto build test WARNING on media-tree/master]
[also build test WARNING on broonie-sound/for-next tiwai-sound/for-next tiwai-sound/for-linus linus/master v6.6 next-20231110]
[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/Shengjiu-Wang/ASoC-fsl_asrc-define-functions-for-memory-to-memory-usage/20231110-143635
base:   git://linuxtv.org/media_tree.git master
patch link:    https://lore.kernel.org/r/1699595289-25773-16-git-send-email-shengjiu.wang%40nxp.com
patch subject: [PATCH v9 15/15] media: vim2m-audio: add virtual driver for audio memory to memory
config: powerpc64-allyesconfig (https://download.01.org/0day-ci/archive/20231111/202311110805.xhszmZN7-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231111/202311110805.xhszmZN7-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/202311110805.xhszmZN7-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/media/test-drivers/vim2m-audio.c:174:13: warning: variable 'dst_size' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
     174 |         } else if (q_data_src->rate * 2 == q_data_dst->rate) {
         |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/media/test-drivers/vim2m-audio.c:184:46: note: uninitialized use occurs here
     184 |         vb2_set_plane_payload(&dst_buf->vb2_buf, 0, dst_size);
         |                                                     ^~~~~~~~
   drivers/media/test-drivers/vim2m-audio.c:174:9: note: remove the 'if' if its condition is always true
     174 |         } else if (q_data_src->rate * 2 == q_data_dst->rate) {
         |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/media/test-drivers/vim2m-audio.c:137:24: note: initialize the variable 'dst_size' to silence this warning
     137 |         int src_size, dst_size;
         |                               ^
         |                                = 0
   1 warning generated.


vim +174 drivers/media/test-drivers/vim2m-audio.c

   123	
   124	/*
   125	 * mem2mem callbacks
   126	 */
   127	
   128	/*
   129	 * device_run() - prepares and starts the device
   130	 */
   131	static void device_run(void *priv)
   132	{
   133		struct audm2m_ctx *ctx = priv;
   134		struct audm2m_dev *audm2m_dev;
   135		struct vb2_v4l2_buffer *src_buf, *dst_buf;
   136		struct audm2m_q_data *q_data_src, *q_data_dst;
   137		int src_size, dst_size;
   138		short *src_addr, *dst_addr;
   139		int i;
   140	
   141		audm2m_dev = ctx->dev;
   142	
   143		q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_AUDIO_OUTPUT);
   144		if (!q_data_src)
   145			return;
   146	
   147		q_data_dst = get_q_data(ctx, V4L2_BUF_TYPE_AUDIO_CAPTURE);
   148		if (!q_data_dst)
   149			return;
   150	
   151		src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
   152		dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
   153		src_buf->sequence = q_data_src->sequence++;
   154		dst_buf->sequence = q_data_dst->sequence++;
   155		v4l2_m2m_buf_copy_metadata(src_buf, dst_buf, false);
   156	
   157		/* Process the conversion */
   158		src_size = vb2_get_plane_payload(&src_buf->vb2_buf, 0);
   159	
   160		src_addr = vb2_plane_vaddr(&src_buf->vb2_buf, 0);
   161		dst_addr = vb2_plane_vaddr(&dst_buf->vb2_buf, 0);
   162	
   163		if (q_data_src->rate == q_data_dst->rate) {
   164			memcpy(dst_addr, src_addr, src_size);
   165			dst_size = src_size;
   166		} else if (q_data_src->rate == 2 * q_data_dst->rate) {
   167			/* 8k to 16k */
   168			for (i = 0; i < src_size / 2; i++) {
   169				*dst_addr++ = *src_addr++;
   170				src_addr++;
   171			}
   172	
   173			dst_size = src_size / 2;
 > 174		} else if (q_data_src->rate * 2 == q_data_dst->rate) {
   175			/* 16k to 8k */
   176			for (i = 0; i < src_size / 2; i++) {
   177				*dst_addr++ = *src_addr;
   178				*dst_addr++ = *src_addr++;
   179			}
   180	
   181			dst_size = src_size * 2;
   182		}
   183	
   184		vb2_set_plane_payload(&dst_buf->vb2_buf, 0, dst_size);
   185	
   186		src_buf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
   187		dst_buf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
   188	
   189		v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_DONE);
   190		v4l2_m2m_buf_done(dst_buf, VB2_BUF_STATE_DONE);
   191		v4l2_m2m_job_finish(audm2m_dev->m2m_dev, ctx->fh.m2m_ctx);
   192	}
   193	

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