From owner-freebsd-multimedia  Mon Jul 14 15:02:48 1997
Return-Path: <owner-multimedia>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.5/8.8.5) id PAA17050
          for multimedia-outgoing; Mon, 14 Jul 1997 15:02:48 -0700 (PDT)
Received: from rah.star-gate.com (rah.star-gate.com [204.188.121.18])
          by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id PAA17041
          for <multimedia@FreeBSD.ORG>; Mon, 14 Jul 1997 15:02:41 -0700 (PDT)
Received: from rah.star-gate.com (localhost.star-gate.com [127.0.0.1])
	by rah.star-gate.com (8.8.5/8.8.5) with ESMTP id PAA06284;
	Mon, 14 Jul 1997 15:02:37 -0700 (PDT)
Message-Id: <199707142202.PAA06284@rah.star-gate.com>
To: Randall Hopper <rhh@ct.picker.com>
cc: Oliver Fromme <oliver.fromme@heim3.tu-clausthal.de>,
        multimedia@FreeBSD.ORG
Subject: Re: guspnp9: /dev/dsp close() hangs 
In-reply-to: Your message of "Mon, 14 Jul 1997 17:33:35 EDT."
             <19970714173335.27084@ct.picker.com> 
Date: Mon, 14 Jul 1997 15:02:37 -0700
From: Amancio Hasty <hasty@rah.star-gate.com>
Sender: owner-multimedia@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

If you are interested in hacking:

audio_release calls :
dma_sync
module specific close routine (sb_close..)

According to the output which Randall sent me it appears that
dma_sync is waiting on the last buffer to be processed by
the soundcard. I think that dma_sync can return without processing
all the buffers if thats the case, then sb_close will turn off 
processing interrupts from the sb card and the buffer will not be
processed.
	Amancio
>From The Desk Of Randall Hopper :
> Amancio Hasty:
>  |In sb_dsp_close:
>  |Move down sb_free_irq to after dsp_cleanup.
>  |
>  |   /* DMAbuf_close_dma (dev); */
>  |    /* sb_dsp_command (0xd4); */
>  |    dsp_cleanup();
>  |    sb_free_irq();
>  |
>  |sb16dsp.c:sb16_dsp_close has the same problem.
>  |
>  |See if that fixes the sb cards hanging during a close.
> 
> No change.  When I got to looking closer at sb_free_irq, I saw why :-)
> 
>      void
>      sb_free_irq(void)
>      {
>      }
> 
> Randall