From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: Re: USB recording - repetitive peaks
Date: Fri, 05 Jul 2002 15:44:27 +0200
Sender: alsa-devel-admin@lists.sourceforge.net
Message-ID: <s5h1yaiwapw.wl@alsa2.suse.de>
References: <3D208C5C.36649172@ladisch.de>
	<s5hhejibem0.wl@alsa2.suse.de>
	<3D21B878.8090902@boosthardware.com>
	<s5hy9curxdr.wl@alsa2.suse.de>
	<3D21C827.2060602@boosthardware.com>
	<s5hwuseruac.wl@alsa2.suse.de>
	<3D21D6CA.7000308@boosthardware.com>
	<s5hu1nirsni.wl@alsa2.suse.de>
	<3D21DDFD.6000206@boosthardware.com>
	<3D21EB37.7070008@boosthardware.com>
	<s5hpty5ry0y.wl@alsa2.suse.de>
	<3D247676.8090309@boosthardware.com>
	<s5hu1nfqx22.wl@alsa2.suse.de>
	<3D2482BB.5020506@boosthardware.com>
Mime-Version: 1.0 (generated by SEMI 1.14.3 - "Ushinoya")
Content-Type: text/plain; charset=US-ASCII
Return-path: <alsa-devel-admin@lists.sourceforge.net>
In-Reply-To: <3D2482BB.5020506@boosthardware.com>
Errors-To: alsa-devel-admin@lists.sourceforge.net
List-Help: <mailto:alsa-devel-request@lists.sourceforge.net?subject=help>
List-Post: <mailto:alsa-devel@lists.sourceforge.net>
List-Subscribe: <https://lists.sourceforge.net/lists/listinfo/alsa-devel>,
	<mailto:alsa-devel-request@lists.sourceforge.net?subject=subscribe>
List-Unsubscribe: <https://lists.sourceforge.net/lists/listinfo/alsa-devel>,
	<mailto:alsa-devel-request@lists.sourceforge.net?subject=unsubscribe>
List-Archive: <http://www.geocrawler.com/redir-sf.php3?list=alsa-devel>
To: Patrick Shirkey <pshirkey@boosthardware.com>
Cc: alsa-devel@lists.sourceforge.net
List-Id: alsa-devel@alsa-project.org

At Fri, 05 Jul 2002 02:15:39 +0900,
Patrick Shirkey wrote:
> 
> Takashi Iwai wrote:
> > At Fri, 05 Jul 2002 01:23:18 +0900,
> > Patrick Shirkey wrote:
> > 
> >>Takashi Iwai wrote:
> >>
> >> >the hang-up at capture close was at least fixed on cvs.
> >> >it was due to the combination of ASYNC_UNLINK and complete callbacks.
> >> >
> >> >not sure whether the bug with jack is fixed, too, but i think it was 
> >> >caused by the same reason.  please update the cvs tree.
> >>
> >>I can now record successfully using arecord without hanging the system
> >>but now I get an instant lock up while starting ardour. :( I have a 
> >>suspicion that it happens when ardour registers with jackd and asks for 
> >>the available input devices.  (I'm not sure about the sound quality. I 
> >>will see if I can generate a test tone to use instead of actual music).
> > 
> > 
> > then could you remove the mask USB_ASYNC_UNLINK from line 826 of
> > usbaudio.c? 
> > this might also leads to a lock-up when usb_submit_urb() fails, but
> > this must happen rarely.
> > 
> 
> First I tried
> 
> 		u->urb->transfer_flags = USB_ISO_ASAP; /*  |  USB_ASYNC_UNLINK; */
> 
> but that made almost no difference. I was able to load ardour for about 
> 10 seconds before the machine hung.

i (hopefully) found the spot.
it happend when snd_pcm_stop() is called during complete callbacks, so
the working urb won't be released properly.
now the fixed version is on cvs.


Takashi


-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Bringing you mounds of caffeinated joy.
http://thinkgeek.com/sf