diff options
Diffstat (limited to 'kernel/sound/usb/card.c')
| -rw-r--r-- | kernel/sound/usb/card.c | 110 |
1 files changed, 63 insertions, 47 deletions
diff --git a/kernel/sound/usb/card.c b/kernel/sound/usb/card.c index 045059398..1f09d9591 100644 --- a/kernel/sound/usb/card.c +++ b/kernel/sound/usb/card.c @@ -365,13 +365,15 @@ static int snd_usb_audio_create(struct usb_interface *intf, } mutex_init(&chip->mutex); - init_rwsem(&chip->shutdown_rwsem); + init_waitqueue_head(&chip->shutdown_wait); chip->index = idx; chip->dev = dev; chip->card = card; chip->setup = device_setup[idx]; chip->autoclock = autoclock; - chip->probing = 1; + atomic_set(&chip->active, 1); /* avoid autopm during probing */ + atomic_set(&chip->usage_count, 0); + atomic_set(&chip->shutdown, 0); chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), le16_to_cpu(dev->descriptor.idProduct)); @@ -495,13 +497,13 @@ static int usb_audio_probe(struct usb_interface *intf, mutex_lock(®ister_mutex); for (i = 0; i < SNDRV_CARDS; i++) { if (usb_chip[i] && usb_chip[i]->dev == dev) { - if (usb_chip[i]->shutdown) { + if (atomic_read(&usb_chip[i]->shutdown)) { dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n"); err = -EIO; goto __error; } chip = usb_chip[i]; - chip->probing = 1; + atomic_inc(&chip->active); /* avoid autopm */ break; } } @@ -561,8 +563,8 @@ static int usb_audio_probe(struct usb_interface *intf, usb_chip[chip->index] = chip; chip->num_interfaces++; - chip->probing = 0; usb_set_intfdata(intf, chip); + atomic_dec(&chip->active); mutex_unlock(®ister_mutex); return 0; @@ -570,7 +572,7 @@ static int usb_audio_probe(struct usb_interface *intf, if (chip) { if (!chip->num_interfaces) snd_card_free(chip->card); - chip->probing = 0; + atomic_dec(&chip->active); } mutex_unlock(®ister_mutex); return err; @@ -585,23 +587,23 @@ static void usb_audio_disconnect(struct usb_interface *intf) struct snd_usb_audio *chip = usb_get_intfdata(intf); struct snd_card *card; struct list_head *p; - bool was_shutdown; if (chip == (void *)-1L) return; card = chip->card; - down_write(&chip->shutdown_rwsem); - was_shutdown = chip->shutdown; - chip->shutdown = 1; - up_write(&chip->shutdown_rwsem); mutex_lock(®ister_mutex); - if (!was_shutdown) { + if (atomic_inc_return(&chip->shutdown) == 1) { struct snd_usb_stream *as; struct snd_usb_endpoint *ep; struct usb_mixer_interface *mixer; + /* wait until all pending tasks done; + * they are protected by snd_usb_lock_shutdown() + */ + wait_event(chip->shutdown_wait, + !atomic_read(&chip->usage_count)); snd_card_disconnect(card); /* release the pcm resources */ list_for_each_entry(as, &chip->pcm_list, list) { @@ -631,28 +633,52 @@ static void usb_audio_disconnect(struct usb_interface *intf) } } -#ifdef CONFIG_PM - -int snd_usb_autoresume(struct snd_usb_audio *chip) +/* lock the shutdown (disconnect) task and autoresume */ +int snd_usb_lock_shutdown(struct snd_usb_audio *chip) { - int err = -ENODEV; + int err; - down_read(&chip->shutdown_rwsem); - if (chip->probing || chip->in_pm) - err = 0; - else if (!chip->shutdown) - err = usb_autopm_get_interface(chip->pm_intf); - up_read(&chip->shutdown_rwsem); + atomic_inc(&chip->usage_count); + if (atomic_read(&chip->shutdown)) { + err = -EIO; + goto error; + } + err = snd_usb_autoresume(chip); + if (err < 0) + goto error; + return 0; + error: + if (atomic_dec_and_test(&chip->usage_count)) + wake_up(&chip->shutdown_wait); return err; } +/* autosuspend and unlock the shutdown */ +void snd_usb_unlock_shutdown(struct snd_usb_audio *chip) +{ + snd_usb_autosuspend(chip); + if (atomic_dec_and_test(&chip->usage_count)) + wake_up(&chip->shutdown_wait); +} + +#ifdef CONFIG_PM + +int snd_usb_autoresume(struct snd_usb_audio *chip) +{ + if (atomic_read(&chip->shutdown)) + return -EIO; + if (atomic_inc_return(&chip->active) == 1) + return usb_autopm_get_interface(chip->pm_intf); + return 0; +} + void snd_usb_autosuspend(struct snd_usb_audio *chip) { - down_read(&chip->shutdown_rwsem); - if (!chip->shutdown && !chip->probing && !chip->in_pm) + if (atomic_read(&chip->shutdown)) + return; + if (atomic_dec_and_test(&chip->active)) 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) @@ -665,30 +691,20 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) if (chip == (void *)-1L) return 0; - if (!PMSG_IS_AUTO(message)) { + chip->autosuspended = !!PMSG_IS_AUTO(message); + if (!chip->autosuspended) snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); - if (!chip->num_suspended_intf++) { - list_for_each_entry(as, &chip->pcm_list, list) { - snd_pcm_suspend_all(as->pcm); - as->substream[0].need_setup_ep = - as->substream[1].need_setup_ep = true; - } - list_for_each(p, &chip->midi_list) { - snd_usbmidi_suspend(p); - } + if (!chip->num_suspended_intf++) { + list_for_each_entry(as, &chip->pcm_list, list) { + snd_pcm_suspend_all(as->pcm); + as->substream[0].need_setup_ep = + as->substream[1].need_setup_ep = true; } - } else { - /* - * otherwise we keep the rest of the system in the dark - * to keep this transparent - */ - if (!chip->num_suspended_intf++) - chip->autosuspended = 1; - } - - if (chip->num_suspended_intf == 1) + list_for_each(p, &chip->midi_list) + snd_usbmidi_suspend(p); list_for_each_entry(mixer, &chip->mixer_list, list) snd_usb_mixer_suspend(mixer); + } return 0; } @@ -705,7 +721,7 @@ static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume) if (--chip->num_suspended_intf) return 0; - chip->in_pm = 1; + atomic_inc(&chip->active); /* avoid autopm */ /* * ALSA leaves material resumption to user space * we just notify and restart the mixers @@ -725,7 +741,7 @@ static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume) chip->autosuspended = 0; err_out: - chip->in_pm = 0; + atomic_dec(&chip->active); /* allow autopm after this point */ return err; } |