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

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Date:	Wed, 30 Apr 2014 08:42:24 +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 Tue, 29 Apr 2014 14:04:15 -0400,
Bryan Quigley wrote:
> 
> I pastebined the full boots syslog here: http://pastebin.ubuntu.com/7360925/
> 
> The only kernel error I get is that pulseaudio hangs.. Nothing more
> specific as to why.
> I can also get a hang if I just run: sudo lsusb -v.  It displays
> Bus 002 Device 002: ID 046d:0825 Logitech, Inc. Webcam C270
> [blinking cursor]

Thanks.  Could you try the patch below?


Takashi

---
diff --git a/sound/usb/card.c b/sound/usb/card.c
index 893d5a1afc3c..28f13def4838 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->num_suspended_intf)
 		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->num_suspended_intf)
 		usb_autopm_put_interface(chip->pm_intf);
 	up_read(&chip->shutdown_rwsem);
 }
@@ -695,8 +695,10 @@ 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;
 }
--
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