Hi Vaibhav,

I love your patch! Perhaps something to improve:

[auto build test WARNING on 98fe05e21a6e0ca242e974650ed58b64813cb2dc]

url:    
https://github.com/0day-ci/linux/commits/Vaibhav-Agarwal/Enable-Greybus-Audio-codec-driver/20200619-192443
base:    98fe05e21a6e0ca242e974650ed58b64813cb2dc
config: nds32-randconfig-r002-20200619 (attached as .config)
compiler: nds32le-linux-gcc (GCC) 9.3.0
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
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross 
ARCH=nds32 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> drivers/staging/greybus/audio_helper.c:59:5: warning: no previous prototype 
>> for 'gbaudio_dapm_link_component_dai_widgets' [-Wmissing-prototypes]
59 | int gbaudio_dapm_link_component_dai_widgets(struct snd_soc_card *card,
|     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/staging/greybus/audio_helper.c:112:5: warning: no previous prototype 
>> for 'gbaudio_dapm_free_controls' [-Wmissing-prototypes]
112 | int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm,
|     ^~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/staging/greybus/audio_helper.c:189:5: warning: no previous prototype 
>> for 'gbaudio_remove_component_controls' [-Wmissing-prototypes]
189 | int gbaudio_remove_component_controls(struct snd_soc_component *component,
|     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
drivers/staging/greybus/audio_topology.c: In function 'find_gb_module':
>> drivers/staging/greybus/audio_topology.c:31:14: warning: variable 'ret' set 
>> but not used [-Wunused-but-set-variable]
31 |  int dev_id, ret;
|              ^~~
drivers/staging/greybus/audio_topology.c: In function 
'gbcodec_mixer_dapm_ctl_get':
>> drivers/staging/greybus/audio_topology.c:380:33: warning: variable 'info' 
>> set but not used [-Wunused-but-set-variable]
380 |  struct gb_audio_ctl_elem_info *info;
|                                 ^~~~

vim +/gbaudio_dapm_link_component_dai_widgets +59 
drivers/staging/greybus/audio_helper.c

1939631ddc545a7 Vaibhav Agarwal 2020-06-19   58  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  @59  int 
gbaudio_dapm_link_component_dai_widgets(struct snd_soc_card *card,
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   60                                 
            struct snd_soc_dapm_context *dapm)
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   61  {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   62         struct 
snd_soc_dapm_widget *dai_w;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   63  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   64         /* For each DAI 
widget... */
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   65         
list_for_each_entry(dai_w, &card->widgets, list) {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   66                 if (dai_w->dapm 
!= dapm)
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   67                         
continue;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   68                 switch 
(dai_w->id) {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   69                 case 
snd_soc_dapm_dai_in:
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   70                 case 
snd_soc_dapm_dai_out:
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   71                         break;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   72                 default:
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   73                         
continue;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   74                 }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   75                 
gbaudio_dapm_link_dai_widget(dai_w, card);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   76         }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   77  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   78         return 0;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   79  }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   80  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   81  static void 
gbaudio_dapm_free_path(struct snd_soc_dapm_path *path)
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   82  {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   83         
list_del(&path->list_node[SND_SOC_DAPM_DIR_IN]);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   84         
list_del(&path->list_node[SND_SOC_DAPM_DIR_OUT]);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   85         
list_del(&path->list_kcontrol);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   86         list_del(&path->list);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   87         kfree(path);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   88  }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   89  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   90  static void 
gbaudio_dapm_free_widget(struct snd_soc_dapm_widget *w)
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   91  {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   92         struct 
snd_soc_dapm_path *p, *next_p;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   93         enum 
snd_soc_dapm_direction dir;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   94  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   95         list_del(&w->list);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   96         /*
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   97          * remove source and 
sink paths associated to this widget.
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   98          * While removing the 
path, remove reference to it from both
1939631ddc545a7 Vaibhav Agarwal 2020-06-19   99          * source and sink 
widgets so that path is removed only once.
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  100          */
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  101         
gbaudio_dapm_for_each_direction(dir) {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  102                 
snd_soc_dapm_widget_for_each_path_safe(w, dir, p, next_p)
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  103                         
gbaudio_dapm_free_path(p);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  104         }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  105  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  106         kfree(w->kcontrols);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  107         kfree_const(w->name);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  108         kfree_const(w->sname);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  109         kfree(w);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  110  }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  111  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19 @112  int 
gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm,
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  113                                
const struct snd_soc_dapm_widget *widget,
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  114                                
int num)
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  115  {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  116         int i;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  117         struct 
snd_soc_dapm_widget *w, *next_w;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  118  #ifdef CONFIG_DEBUG_FS
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  119         struct dentry *parent = 
dapm->debugfs_dapm;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  120         struct dentry 
*debugfs_w = NULL;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  121  #endif
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  122  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  123         
mutex_lock(&dapm->card->dapm_mutex);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  124         for (i = 0; i < num; 
i++) {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  125                 /* below logic 
can be optimized to identify widget pointer */
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  126                 
list_for_each_entry_safe(w, next_w, &dapm->card->widgets,
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  127                                 
         list) {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  128                         if 
(w->dapm != dapm)
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  129                                 
continue;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  130                         if 
(!strcmp(w->name, widget->name))
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  131                                 
break;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  132                         w = 
NULL;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  133                 }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  134                 if (!w) {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  135                         
dev_err(dapm->dev, "%s: widget not found\n",
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  136                                 
widget->name);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  137                         return 
-EINVAL;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  138                 }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  139                 widget++;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  140  #ifdef CONFIG_DEBUG_FS
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  141                 if (!parent)
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  142                         
debugfs_w = debugfs_lookup(w->name, parent);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  143                 
debugfs_remove(debugfs_w);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  144                 debugfs_w = 
NULL;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  145  #endif
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  146                 
gbaudio_dapm_free_widget(w);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  147         }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  148         
mutex_unlock(&dapm->card->dapm_mutex);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  149         return 0;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  150  }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  151  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  152  static int 
gbaudio_remove_controls(struct snd_card *card, struct device *dev,
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  153                                 
   const struct snd_kcontrol_new *controls,
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  154                                 
   int num_controls, const char *prefix)
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  155  {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  156         int i, err;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  157  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  158         for (i = 0; i < 
num_controls; i++) {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  159                 const struct 
snd_kcontrol_new *control = &controls[i];
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  160                 struct 
snd_ctl_elem_id id;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  161                 struct 
snd_kcontrol *kctl;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  162  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  163                 if (prefix)
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  164                         
snprintf(id.name, sizeof(id.name), "%s %s", prefix,
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  165                                 
 control->name);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  166                 else
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  167                         
strlcpy(id.name, control->name, sizeof(id.name));
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  168                 id.numid = 0;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  169                 id.iface = 
control->iface;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  170                 id.device = 
control->device;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  171                 id.subdevice = 
control->subdevice;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  172                 id.index = 
control->index;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  173                 kctl = 
snd_ctl_find_id(card, &id);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  174                 if (!kctl) {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  175                         
dev_err(dev, "%d: Failed to find %s\n", err,
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  176                                 
control->name);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  177                         
continue;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  178                 }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  179                 err = 
snd_ctl_remove(card, kctl);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  180                 if (err < 0) {
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  181                         
dev_err(dev, "%d: Failed to remove %s\n", err,
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  182                                 
control->name);
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  183                         
continue;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  184                 }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  185         }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  186         return 0;
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  187  }
1939631ddc545a7 Vaibhav Agarwal 2020-06-19  188  
1939631ddc545a7 Vaibhav Agarwal 2020-06-19 @189  int 
gbaudio_remove_component_controls(struct snd_soc_component *component,

---
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