tree: https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git test/usb-audio-lowlatency head: 0dbf51c865c64e95c711e4adf89a89140077269e commit: 0dbf51c865c64e95c711e4adf89a89140077269e [198/198] ALSA: usb-audio: Improved lowlatency playback support :::::: branch date: 17 hours ago :::::: commit date: 17 hours ago config: arc-randconfig-s032-20210831 (attached as .config) compiler: arc-elf-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-348-gf0e6938b-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/commit/?id=0... git remote add sound https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git git fetch --no-tags sound test/usb-audio-lowlatency git checkout 0dbf51c865c64e95c711e4adf89a89140077269e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arc SHELL=/bin/bash sound/usb/

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

sparse warnings: (new ones prefixed by >>)

...

sound/usb/pcm.c:1322:12: sparse: sparse: context imbalance in 'prepare_playback_urb' - different lock contexts for basic block

vim +/prepare_playback_urb +1322 sound/usb/pcm.c

e0570446773623 Ricard Wanderlof 2015-10-19 1321 0dbf51c865c64e Takashi Iwai 2021-08-30 @1322 static int prepare_playback_urb(struct snd_usb_substream *subs, edcd3633e72a15 Daniel Mack 2012-04-12 1323 struct urb *urb) edcd3633e72a15 Daniel Mack 2012-04-12 1324 { edcd3633e72a15 Daniel Mack 2012-04-12 1325 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 245baf983cc395 Daniel Mack 2012-08-30 1326 struct snd_usb_endpoint *ep = subs->data_endpoint; edcd3633e72a15 Daniel Mack 2012-04-12 1327 struct snd_urb_ctx *ctx = urb->context; 0dbf51c865c64e Takashi Iwai 2021-08-30 1328 unsigned int counts, frames, bytes, transfer_done; edcd3633e72a15 Daniel Mack 2012-04-12 1329 int i, stride, period_elapsed = 0; edcd3633e72a15 Daniel Mack 2012-04-12 1330 unsigned long flags; edcd3633e72a15 Daniel Mack 2012-04-12 1331 d303c5d38b37ee Takashi Iwai 2021-06-01 1332 stride = ep->stride; edcd3633e72a15 Daniel Mack 2012-04-12 1333 edcd3633e72a15 Daniel Mack 2012-04-12 1334 frames = 0; e8a8f09cb0b3b8 Takashi Iwai 2021-06-01 1335 ctx->queued = 0; edcd3633e72a15 Daniel Mack 2012-04-12 1336 urb->number_of_packets = 0; edcd3633e72a15 Daniel Mack 2012-04-12 1337 spin_lock_irqsave(&subs->lock, flags); 976b6c064a9574 Alan Stern 2013-09-24 1338 subs->frame_limit += ep->max_urb_frames; 0dbf51c865c64e Takashi Iwai 2021-08-30 1339 transfer_done = subs->transfer_done; edcd3633e72a15 Daniel Mack 2012-04-12 1340 for (i = 0; i < ctx->packets; i++) { 3d58760f4d0015 Takashi Iwai 2020-11-23 1341 counts = snd_usb_endpoint_next_packet_size(ep, ctx, i); edcd3633e72a15 Daniel Mack 2012-04-12 1342 /* set up descriptor */ d303c5d38b37ee Takashi Iwai 2021-06-01 1343 urb->iso_frame_desc[i].offset = frames * stride; d303c5d38b37ee Takashi Iwai 2021-06-01 1344 urb->iso_frame_desc[i].length = counts * stride; edcd3633e72a15 Daniel Mack 2012-04-12 1345 frames += counts; edcd3633e72a15 Daniel Mack 2012-04-12 1346 urb->number_of_packets++; 0dbf51c865c64e Takashi Iwai 2021-08-30 1347 transfer_done += counts; 0dbf51c865c64e Takashi Iwai 2021-08-30 1348 if (transfer_done >= runtime->period_size) { 0dbf51c865c64e Takashi Iwai 2021-08-30 1349 transfer_done -= runtime->period_size; 976b6c064a9574 Alan Stern 2013-09-24 1350 subs->frame_limit = 0; edcd3633e72a15 Daniel Mack 2012-04-12 1351 period_elapsed = 1; edcd3633e72a15 Daniel Mack 2012-04-12 1352 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 0dbf51c865c64e Takashi Iwai 2021-08-30 1353 if (transfer_done > 0) { edcd3633e72a15 Daniel Mack 2012-04-12 1354 /* FIXME: fill-max mode is not edcd3633e72a15 Daniel Mack 2012-04-12 1355 * supported yet */ 0dbf51c865c64e Takashi Iwai 2021-08-30 1356 frames -= transfer_done; 0dbf51c865c64e Takashi Iwai 2021-08-30 1357 counts -= transfer_done; edcd3633e72a15 Daniel Mack 2012-04-12 1358 urb->iso_frame_desc[i].length = d303c5d38b37ee Takashi Iwai 2021-06-01 1359 counts * stride; 0dbf51c865c64e Takashi Iwai 2021-08-30 1360 transfer_done = 0; edcd3633e72a15 Daniel Mack 2012-04-12 1361 } edcd3633e72a15 Daniel Mack 2012-04-12 1362 i++; edcd3633e72a15 Daniel Mack 2012-04-12 1363 if (i < ctx->packets) { edcd3633e72a15 Daniel Mack 2012-04-12 1364 /* add a transfer delimiter */ edcd3633e72a15 Daniel Mack 2012-04-12 1365 urb->iso_frame_desc[i].offset = d303c5d38b37ee Takashi Iwai 2021-06-01 1366 frames * stride; edcd3633e72a15 Daniel Mack 2012-04-12 1367 urb->iso_frame_desc[i].length = 0; edcd3633e72a15 Daniel Mack 2012-04-12 1368 urb->number_of_packets++; edcd3633e72a15 Daniel Mack 2012-04-12 1369 } edcd3633e72a15 Daniel Mack 2012-04-12 1370 break; edcd3633e72a15 Daniel Mack 2012-04-12 1371 } edcd3633e72a15 Daniel Mack 2012-04-12 1372 } 976b6c064a9574 Alan Stern 2013-09-24 1373 /* finish at the period boundary or after enough frames */ 0dbf51c865c64e Takashi Iwai 2021-08-30 1374 if ((period_elapsed || transfer_done >= subs->frame_limit) && 976b6c064a9574 Alan Stern 2013-09-24 1375 !snd_usb_endpoint_implicit_feedback_sink(ep)) edcd3633e72a15 Daniel Mack 2012-04-12 1376 break; edcd3633e72a15 Daniel Mack 2012-04-12 1377 } d24f5061ee7b9b Daniel Mack 2013-04-17 1378 0dbf51c865c64e Takashi Iwai 2021-08-30 1379 /* check the appl_ptr in low latency mode */ 0dbf51c865c64e Takashi Iwai 2021-08-30 1380 if (!subs->early_playback_start && 0dbf51c865c64e Takashi Iwai 2021-08-30 1381 frames > snd_pcm_playback_hw_avail(runtime)) 0dbf51c865c64e Takashi Iwai 2021-08-30 @1382 return -EAGAIN; 0dbf51c865c64e Takashi Iwai 2021-08-30 1383 0dbf51c865c64e Takashi Iwai 2021-08-30 1384 bytes = frames * stride; 0dbf51c865c64e Takashi Iwai 2021-08-30 1385 subs->transfer_done = transfer_done; 6aa719d15a1903 Takashi Iwai 2020-11-23 1386 if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE && d24f5061ee7b9b Daniel Mack 2013-04-17 1387 subs->cur_audiofmt->dsd_dop)) { d24f5061ee7b9b Daniel Mack 2013-04-17 1388 fill_playback_urb_dsd_dop(subs, urb, bytes); 6aa719d15a1903 Takashi Iwai 2020-11-23 1389 } else if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U8 && 44dcbbb1cd6156 Daniel Mack 2013-04-17 1390 subs->cur_audiofmt->dsd_bitrev)) { 4f083917994fdd Takashi Iwai 2021-06-01 1391 fill_playback_urb_dsd_bitrev(subs, urb, bytes); d24f5061ee7b9b Daniel Mack 2013-04-17 1392 } else { d24f5061ee7b9b Daniel Mack 2013-04-17 1393 /* usual PCM */ e0570446773623 Ricard Wanderlof 2015-10-19 1394 if (!subs->tx_length_quirk) b97a936910c8d6 Ricard Wanderlof 2015-10-19 1395 copy_to_urb(subs, urb, 0, stride, bytes); e0570446773623 Ricard Wanderlof 2015-10-19 1396 else e0570446773623 Ricard Wanderlof 2015-10-19 1397 bytes = copy_to_urb_quirk(subs, urb, stride, bytes); e0570446773623 Ricard Wanderlof 2015-10-19 1398 /* bytes is now amount of outgoing data */ d24f5061ee7b9b Daniel Mack 2013-04-17 1399 } d24f5061ee7b9b Daniel Mack 2013-04-17 1400 fbcfbf5f673847 Daniel Mack 2012-08-30 1401 subs->last_frame_number = usb_get_current_frame_number(subs->dev); fbcfbf5f673847 Daniel Mack 2012-08-30 1402 ea33d359c4421f Pierre-Louis Bossart 2015-02-06 1403 if (subs->trigger_tstamp_pending_update) { ea33d359c4421f Pierre-Louis Bossart 2015-02-06 1404 /* this is the first actual URB submitted, ea33d359c4421f Pierre-Louis Bossart 2015-02-06 1405 * update trigger timestamp to reflect actual start time ea33d359c4421f Pierre-Louis Bossart 2015-02-06 1406 */ ea33d359c4421f Pierre-Louis Bossart 2015-02-06 1407 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); ea33d359c4421f Pierre-Louis Bossart 2015-02-06 1408 subs->trigger_tstamp_pending_update = false; ea33d359c4421f Pierre-Louis Bossart 2015-02-06 1409 } ea33d359c4421f Pierre-Louis Bossart 2015-02-06 1410 4267c5a8f3133d Takashi Iwai 2021-08-27 1411 if (period_elapsed && !subs->running && !subs->early_playback_start) { 307cc9baac5c07 Takashi Iwai 2021-07-07 1412 subs->period_elapsed_pending = 1; 307cc9baac5c07 Takashi Iwai 2021-07-07 1413 period_elapsed = 0; 307cc9baac5c07 Takashi Iwai 2021-07-07 1414 } edcd3633e72a15 Daniel Mack 2012-04-12 1415 spin_unlock_irqrestore(&subs->lock, flags); edcd3633e72a15 Daniel Mack 2012-04-12 1416 urb->transfer_buffer_length = bytes; edcd3633e72a15 Daniel Mack 2012-04-12 1417 if (period_elapsed) edcd3633e72a15 Daniel Mack 2012-04-12 1418 snd_pcm_period_elapsed(subs->pcm_substream); 0dbf51c865c64e Takashi Iwai 2021-08-30 1419 return 0; edcd3633e72a15 Daniel Mack 2012-04-12 1420 } edcd3633e72a15 Daniel Mack 2012-04-12 1421

--- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org