linux-kernel - Re: PROBLEM: Pulseaudio hung at schedule in 3.15-rc1

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Date:	Fri, 2 May 2014 10:33:57 -0400
From:	Bryan Quigley <gquigs@...il.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: Pulseaudio hung at schedule in 3.15-rc1

That looks good!
Thanks!
Bryan

On Fri, May 2, 2014 at 3:36 AM, Takashi Iwai <tiwai@...e.de> wrote:
> At Wed, 30 Apr 2014 13:40:11 -0400,
> Bryan Quigley wrote:
>>
>> > Hm, what about the one below instead?
>> >
>> >
>> > Takashi
>>
>> It works now!  Still gives me some errors, but both the webcam and
>> microphone function fine..
>>
>> On pluging it in, all seems normal:
>> Apr 30 13:33:29 dell-laptop kernel: [  467.144143] usb 2-2: new
>> high-speed USB device number 4 using ehci-pci
>> Apr 30 13:33:30 dell-laptop kernel: [  467.492931] usb 2-2: New USB
>> device found, idVendor=046d, idProduct=0825
>> Apr 30 13:33:30 dell-laptop kernel: [  467.492939] usb 2-2: New USB
>> device strings: Mfr=0, Product=0, SerialNumber=2
>> Apr 30 13:33:30 dell-laptop kernel: [  467.492943] usb 2-2:
>> SerialNumber: 0911F220
>> Apr 30 13:33:30 dell-laptop kernel: [  467.493799] uvcvideo: Found UVC
>> 1.00 device <unnamed> (046d:0825)
>> Apr 30 13:33:30 dell-laptop kernel: [  467.590713] input: UVC Camera
>> (046d:0825) as /devices/pci0000:00/0000:00:1d.7/usb2/2-2/2-2:1.0/input/input20
>> Apr 30 13:33:31 dell-laptop kernel: [  468.753801] usb 2-2: set
>> resolution quirk: cval->res = 384
>>
>> But on any access (sudo lsusb -v, open webcam, etc), it will give:
>> Apr 30 13:35:21 dell-laptop kernel: [  578.788135] usb 2-2: reset
>> high-speed USB device number 4 using ehci-pci
>> Apr 30 13:35:21 dell-laptop kernel: [  579.142380] snd-usb-audio
>> 2-2:1.2: reset_resume error -5
>>
>> Doesn't seem to affect performance at all though..
>
> OK, the error above comes from my patch returning an error at auto
> suspend callback.  How about the revised patch below?
>
>
> thanks,
>
> Takashi
>
> ---
> diff --git a/sound/usb/card.c b/sound/usb/card.c
> index 893d5a1afc3c..c3b5b7dca1c3 100644
> --- a/sound/usb/card.c
> +++ b/sound/usb/card.c
> @@ -651,7 +651,7 @@ int snd_usb_autoresume(struct snd_usb_audio *chip)
>         int err = -ENODEV;
>
>         down_read(&chip->shutdown_rwsem);
> -       if (chip->probing)
> +       if (chip->probing && chip->in_pm)
>                 err = 0;
>         else if (!chip->shutdown)
>                 err = usb_autopm_get_interface(chip->pm_intf);
> @@ -663,7 +663,7 @@ int snd_usb_autoresume(struct snd_usb_audio *chip)
>  void snd_usb_autosuspend(struct snd_usb_audio *chip)
>  {
>         down_read(&chip->shutdown_rwsem);
> -       if (!chip->shutdown && !chip->probing)
> +       if (!chip->shutdown && !chip->probing && !chip->in_pm)
>                 usb_autopm_put_interface(chip->pm_intf);
>         up_read(&chip->shutdown_rwsem);
>  }
> @@ -695,8 +695,9 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
>                         chip->autosuspended = 1;
>         }
>
> -       list_for_each_entry(mixer, &chip->mixer_list, list)
> -               snd_usb_mixer_suspend(mixer);
> +       if (chip->num_suspended_intf == 1)
> +               list_for_each_entry(mixer, &chip->mixer_list, list)
> +                       snd_usb_mixer_suspend(mixer);
>
>         return 0;
>  }
> @@ -711,6 +712,8 @@ static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
>                 return 0;
>         if (--chip->num_suspended_intf)
>                 return 0;
> +
> +       chip->in_pm = 1;
>         /*
>          * ALSA leaves material resumption to user space
>          * we just notify and restart the mixers
> @@ -726,6 +729,7 @@ static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
>         chip->autosuspended = 0;
>
>  err_out:
> +       chip->in_pm = 0;
>         return err;
>  }
>
> diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
> index 25c4c7e217de..91d0380431b4 100644
> --- a/sound/usb/usbaudio.h
> +++ b/sound/usb/usbaudio.h
> @@ -40,6 +40,7 @@ struct snd_usb_audio {
>         struct rw_semaphore shutdown_rwsem;
>         unsigned int shutdown:1;
>         unsigned int probing:1;
> +       unsigned int in_pm:1;
>         unsigned int autosuspended:1;
>         unsigned int txfr_quirk:1; /* Subframe boundaries on transfers */
>
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