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

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Date:	Fri, 02 May 2014 09:36:32 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Bryan Quigley <gquigs@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: Pulseaudio hung at schedule in 3.15-rc1

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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