Re: [PATCH v2 2/2] ALSA: Add new driver for Marian M2 sound card

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

Hi Ivan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tiwai-sound/for-next]
[also build test WARNING on tiwai-sound/for-linus linus/master v6.6 next-20231103]
[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/Ivan-Orlov/ALSA-Add-new-driver-for-Marian-M2-sound-card/20230919-021236
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-next
patch link:    https://lore.kernel.org/r/20230918181044.7257-2-ivan.orlov0322%40gmail.com
patch subject: [PATCH v2 2/2] ALSA: Add new driver for Marian M2 sound card
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20231106/202311060403.591giMV8-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231106/202311060403.591giMV8-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/202311060403.591giMV8-lkp@intel.com/

All warnings (new ones prefixed by >>):

   sound/pci/marianm2.c:466:6: warning: variable 'buffer_frames' set but not used [-Wunused-but-set-variable]
           int buffer_frames;
               ^
>> sound/pci/marianm2.c:472:11: warning: variable 'speedmode' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           else if (params_rate(params) < RATE_FAST)
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   sound/pci/marianm2.c:475:6: note: uninitialized use occurs here
           if (speedmode > marian->desc->speedmode_max) {
               ^~~~~~~~~
   sound/pci/marianm2.c:472:7: note: remove the 'if' if its condition is always true
           else if (params_rate(params) < RATE_FAST)
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   sound/pci/marianm2.c:465:24: note: initialize the variable 'speedmode' to silence this warning
           unsigned int speedmode;
                                 ^
                                  = 0
   2 warnings generated.


vim +472 sound/pci/marianm2.c

   460	
   461	static int snd_marian_hw_params(struct snd_pcm_substream *substream,
   462					struct snd_pcm_hw_params *params)
   463	{
   464		struct marian_card *marian = snd_pcm_substream_chip(substream);
   465		unsigned int speedmode;
 > 466		int buffer_frames;
   467	
   468		buffer_frames = SUBSTREAM_BUF_SIZE / M2_FRAME_SIZE;
   469	
   470		if (params_rate(params) < RATE_SLOW)
   471			speedmode = SPEEDMODE_SLOW;
 > 472		else if (params_rate(params) < RATE_FAST)
   473			speedmode = SPEEDMODE_FAST;
   474	
   475		if (speedmode > marian->desc->speedmode_max) {
   476			dev_err(marian->card->dev,
   477				"Requested rate (%u Hz) higher than card's maximum\n",
   478				params_rate(params));
   479			_snd_pcm_hw_param_setempty(params, SNDRV_PCM_HW_PARAM_RATE);
   480			return -EBUSY;
   481		}
   482	
   483		spin_lock(&marian->reglock);
   484		if (marian->desc->set_speedmode)
   485			marian->desc->set_speedmode(marian, speedmode);
   486		else
   487			marian_generic_set_speedmode(marian, speedmode);
   488	
   489		marian->detune = 0;
   490	
   491		marian_generic_set_dco(marian, params_rate(params), 0);
   492		spin_unlock(&marian->reglock);
   493	
   494		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
   495			snd_pcm_set_runtime_buffer(substream, &marian->playback_buf);
   496		else
   497			snd_pcm_set_runtime_buffer(substream, &marian->capture_buf);
   498	
   499		// apply optional card specific hw constraints
   500		if (marian->desc->hw_constraints_func)
   501			marian->desc->hw_constraints_func(marian, substream, params);
   502	
   503		return 0;
   504	}
   505	

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