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-A... 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 <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): 59 | int gbaudio_dapm_link_component_dai_widgets(struct snd_soc_card *card, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 112 | int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm, | ^~~~~~~~~~~~~~~~~~~~~~~~~~ 189 | int gbaudio_remove_component_controls(struct snd_soc_component *component, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- drivers/staging/greybus/audio_topology.c: In function 'find_gb_module': 31 | int dev_id, ret; | ^~~ drivers/staging/greybus/audio_topology.c: In function 'gbcodec_mixer_dapm_ctl_get': 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, --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org