diff options
Diffstat (limited to 'sound/usb/stream.c')
| -rw-r--r-- | sound/usb/stream.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/sound/usb/stream.c b/sound/usb/stream.c index c4339f97226b..b43b6eec3227 100644 --- a/sound/usb/stream.c +++ b/sound/usb/stream.c @@ -281,8 +281,6 @@ static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits, const unsigned int *maps; int c; - if (!bits) - return NULL; if (channels > ARRAY_SIZE(chmap->map)) return NULL; @@ -293,9 +291,19 @@ static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits, maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps; chmap->channels = channels; c = 0; - for (; bits && *maps; maps++, bits >>= 1) { - if (bits & 1) - chmap->map[c++] = *maps; + + if (bits) { + for (; bits && *maps; maps++, bits >>= 1) + if (bits & 1) + chmap->map[c++] = *maps; + } else { + /* If we're missing wChannelConfig, then guess something + to make sure the channel map is not skipped entirely */ + if (channels == 1) + chmap->map[c++] = SNDRV_CHMAP_MONO; + else + for (; c < channels && *maps; maps++) + chmap->map[c++] = *maps; } for (; c < channels; c++) |