tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.4 head: 4bd8020d6c753ab56df4d7bd75833fd880e1995a commit: 7c9ada4789d0d2072ed57bf55ddb679fa63ea393 [99/120] ALSA: usb-audio: Drop bogus dB range in too low level config: powerpc64-randconfig-r006-20210320 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 436c6c9c20cc522c92a923440a5fc509c342a7db) 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 # install powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.4 git checkout 7c9ada4789d0d2072ed57bf55ddb679fa63ea393 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): cval->head.id, mixer_ctrl_intf(cval->head.mixer), ^ 1 error generated. vim +/mixer_ctrl_intf +1300 sound/usb/mixer.c 1186 1187 /* 1188 * retrieve the minimum and maximum values for the specified control 1189 */ 1190 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval, 1191 int default_min, struct snd_kcontrol *kctl) 1192 { 1193 /* for failsafe */ 1194 cval->min = default_min; 1195 cval->max = cval->min + 1; 1196 cval->res = 1; 1197 cval->dBmin = cval->dBmax = 0; 1198 1199 if (cval->val_type == USB_MIXER_BOOLEAN || 1200 cval->val_type == USB_MIXER_INV_BOOLEAN) { 1201 cval->initialized = 1; 1202 } else { 1203 int minchn = 0; 1204 if (cval->cmask) { 1205 int i; 1206 for (i = 0; i < MAX_CHANNELS; i++) 1207 if (cval->cmask & (1 << i)) { 1208 minchn = i + 1; 1209 break; 1210 } 1211 } 1212 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 || 1213 get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) { 1214 usb_audio_err(cval->head.mixer->chip, 1215 "%d:%d: cannot get min/max values for control %d (id %d)\n", 1216 cval->head.id, snd_usb_ctrl_intf(cval->head.mixer->chip), 1217 cval->control, cval->head.id); 1218 return -EINVAL; 1219 } 1220 if (get_ctl_value(cval, UAC_GET_RES, 1221 (cval->control << 8) | minchn, 1222 &cval->res) < 0) { 1223 cval->res = 1; 1224 } else { 1225 int last_valid_res = cval->res; 1226 1227 while (cval->res > 1) { 1228 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES, 1229 (cval->control << 8) | minchn, 1230 cval->res / 2) < 0) 1231 break; 1232 cval->res /= 2; 1233 } 1234 if (get_ctl_value(cval, UAC_GET_RES, 1235 (cval->control << 8) | minchn, &cval->res) < 0) 1236 cval->res = last_valid_res; 1237 } 1238 if (cval->res == 0) 1239 cval->res = 1; 1240 1241 /* Additional checks for the proper resolution 1242 * 1243 * Some devices report smaller resolutions than actually 1244 * reacting. They don't return errors but simply clip 1245 * to the lower aligned value. 1246 */ 1247 if (cval->min + cval->res < cval->max) { 1248 int last_valid_res = cval->res; 1249 int saved, test, check; 1250 if (get_cur_mix_raw(cval, minchn, &saved) < 0) 1251 goto no_res_check; 1252 for (;;) { 1253 test = saved; 1254 if (test < cval->max) 1255 test += cval->res; 1256 else 1257 test -= cval->res; 1258 if (test < cval->min || test > cval->max || 1259 snd_usb_set_cur_mix_value(cval, minchn, 0, test) || 1260 get_cur_mix_raw(cval, minchn, &check)) { 1261 cval->res = last_valid_res; 1262 break; 1263 } 1264 if (test == check) 1265 break; 1266 cval->res *= 2; 1267 } 1268 snd_usb_set_cur_mix_value(cval, minchn, 0, saved); 1269 } 1270 1271 no_res_check: 1272 cval->initialized = 1; 1273 } 1274 1275 if (kctl) 1276 volume_control_quirks(cval, kctl); 1277 1278 /* USB descriptions contain the dB scale in 1/256 dB unit 1279 * while ALSA TLV contains in 1/100 dB unit 1280 */ 1281 cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256; 1282 cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256; 1283 if (cval->dBmin > cval->dBmax) { 1284 /* something is wrong; assume it's either from/to 0dB */ 1285 if (cval->dBmin < 0) 1286 cval->dBmax = 0; 1287 else if (cval->dBmin > 0) 1288 cval->dBmin = 0; 1289 if (cval->dBmin > cval->dBmax) { 1290 /* totally crap, return an error */ 1291 return -EINVAL; 1292 } 1293 } else { 1294 /* if the max volume is too low, it's likely a bogus range; 1295 * here we use -96dB as the threshold 1296 */ 1297 if (cval->dBmax <= -9600) { 1298 usb_audio_info(cval->head.mixer->chip, 1299 "%d:%d: bogus dB values (%d/%d), disabling dB reporting\n", 1301 cval->dBmin, cval->dBmax); 1302 cval->dBmin = cval->dBmax = 0; 1303 } 1304 } 1305 1306 return 0; 1307 } 1308 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org