3.0-stable review patch. If anyone has any objections, please let me know.
------------------ From: Takashi Iwai <ti...@suse.de> commit 34f3c89fda4fba9fe689db22253ca8db2f5e6386 upstream. Replace mutex with rwsem for codec->shutdown protection so that concurrent accesses are allowed. Also add the protection to snd_usb_autosuspend() and snd_usb_autoresume(), too. Reported-by: Matthieu CASTET <matthieu.cas...@parrot.com> Signed-off-by: Takashi Iwai <ti...@suse.de> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- sound/usb/card.c | 12 ++++++++---- sound/usb/mixer.c | 12 ++++++------ sound/usb/pcm.c | 12 ++++++------ sound/usb/usbaudio.h | 2 +- 4 files changed, 21 insertions(+), 17 deletions(-) --- a/sound/usb/card.c +++ b/sound/usb/card.c @@ -335,7 +335,7 @@ static int snd_usb_audio_create(struct u return -ENOMEM; } - mutex_init(&chip->shutdown_mutex); + init_rwsem(&chip->shutdown_rwsem); chip->index = idx; chip->dev = dev; chip->card = card; @@ -555,7 +555,7 @@ static void snd_usb_audio_disconnect(str chip = ptr; card = chip->card; mutex_lock(®ister_mutex); - mutex_lock(&chip->shutdown_mutex); + down_write(&chip->shutdown_rwsem); chip->shutdown = 1; chip->num_interfaces--; if (chip->num_interfaces <= 0) { @@ -573,11 +573,11 @@ static void snd_usb_audio_disconnect(str snd_usb_mixer_disconnect(p); } usb_chip[chip->index] = NULL; - mutex_unlock(&chip->shutdown_mutex); + up_write(&chip->shutdown_rwsem); mutex_unlock(®ister_mutex); snd_card_free_when_closed(card); } else { - mutex_unlock(&chip->shutdown_mutex); + up_write(&chip->shutdown_rwsem); mutex_unlock(®ister_mutex); } } @@ -609,16 +609,20 @@ int snd_usb_autoresume(struct snd_usb_au { int err = -ENODEV; + down_read(&chip->shutdown_rwsem); if (!chip->shutdown && !chip->probing) err = usb_autopm_get_interface(chip->pm_intf); + up_read(&chip->shutdown_rwsem); return err; } void snd_usb_autosuspend(struct snd_usb_audio *chip) { + down_read(&chip->shutdown_rwsem); if (!chip->shutdown && !chip->probing) usb_autopm_put_interface(chip->pm_intf); + up_read(&chip->shutdown_rwsem); } static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -292,7 +292,7 @@ static int get_ctl_value_v1(struct usb_m err = snd_usb_autoresume(cval->mixer->chip); if (err < 0) return -EIO; - mutex_lock(&chip->shutdown_mutex); + down_read(&chip->shutdown_rwsem); while (timeout-- > 0) { if (chip->shutdown) break; @@ -310,7 +310,7 @@ static int get_ctl_value_v1(struct usb_m err = -EINVAL; out: - mutex_unlock(&chip->shutdown_mutex); + up_read(&chip->shutdown_rwsem); snd_usb_autosuspend(cval->mixer->chip); return err; } @@ -337,7 +337,7 @@ static int get_ctl_value_v2(struct usb_m if (ret) goto error; - mutex_lock(&chip->shutdown_mutex); + down_read(&chip->shutdown_rwsem); if (chip->shutdown) ret = -ENODEV; else { @@ -346,7 +346,7 @@ static int get_ctl_value_v2(struct usb_m USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN, validx, idx, buf, size, 1000); } - mutex_unlock(&chip->shutdown_mutex); + up_read(&chip->shutdown_rwsem); snd_usb_autosuspend(chip); if (ret < 0) { @@ -453,7 +453,7 @@ int snd_usb_mixer_set_ctl_value(struct u err = snd_usb_autoresume(chip); if (err < 0) return -EIO; - mutex_lock(&chip->shutdown_mutex); + down_read(&chip->shutdown_rwsem); while (timeout-- > 0) { if (chip->shutdown) break; @@ -471,7 +471,7 @@ int snd_usb_mixer_set_ctl_value(struct u err = -EINVAL; out: - mutex_unlock(&chip->shutdown_mutex); + up_read(&chip->shutdown_rwsem); snd_usb_autosuspend(chip); return err; } --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -350,7 +350,7 @@ static int snd_usb_hw_params(struct snd_ subs->period_bytes != params_period_bytes(hw_params) || subs->cur_rate != rate; - mutex_lock(&subs->stream->chip->shutdown_mutex); + down_read(&subs->stream->chip->shutdown_rwsem); if (subs->stream->chip->shutdown) { ret = -ENODEV; goto unlock; @@ -380,7 +380,7 @@ static int snd_usb_hw_params(struct snd_ } unlock: - mutex_unlock(&subs->stream->chip->shutdown_mutex); + up_read(&subs->stream->chip->shutdown_rwsem); return ret; } @@ -396,9 +396,9 @@ static int snd_usb_hw_free(struct snd_pc subs->cur_audiofmt = NULL; subs->cur_rate = 0; subs->period_bytes = 0; - mutex_lock(&subs->stream->chip->shutdown_mutex); + down_read(&subs->stream->chip->shutdown_rwsem); snd_usb_release_substream_urbs(subs, 0); - mutex_unlock(&subs->stream->chip->shutdown_mutex); + up_read(&subs->stream->chip->shutdown_rwsem); return snd_pcm_lib_free_vmalloc_buffer(substream); } @@ -418,7 +418,7 @@ static int snd_usb_pcm_prepare(struct sn return -ENXIO; } - mutex_lock(&subs->stream->chip->shutdown_mutex); + down_read(&subs->stream->chip->shutdown_rwsem); if (subs->stream->chip->shutdown) { ret = -ENODEV; goto unlock; @@ -435,7 +435,7 @@ static int snd_usb_pcm_prepare(struct sn ret = snd_usb_substream_prepare(subs, runtime); unlock: - mutex_unlock(&subs->stream->chip->shutdown_mutex); + up_read(&subs->stream->chip->shutdown_rwsem); return ret; } --- a/sound/usb/usbaudio.h +++ b/sound/usb/usbaudio.h @@ -36,7 +36,7 @@ struct snd_usb_audio { struct snd_card *card; struct usb_interface *pm_intf; u32 usb_id; - struct mutex shutdown_mutex; + struct rw_semaphore shutdown_rwsem; unsigned int shutdown:1; unsigned int probing:1; unsigned int autosuspended:1; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/