Alsa 0.9.0 RC5 + RH8 + GnomeMeeting

Alsa 0.9.0 RC5 + RH8 + GnomeMeeting

[Damien Sandras]

Hi all,

I subscribed to this mailing list, because GnomeMeeting users have
reported a problem using ALSA 0.9.0RC5 together with GnomeMeeting and
RedHat 8.0.

Actually, the problem is simple to explain, hard to fix, at least for
me. Several users complained that using GnomeMeeting was freezing their
machine. This corresponds to a driver bug, somewhere, as "user-space"
programs can't crash a machine directly. The only particularity of
GnomeMeeting is that it is reading and writing to the device at the same
time.

Only RedHat 8.0 users seem to be affected. Some of the users with
problems installed ALSA 0.9.0RC3 and the problems disappeared.

Are there any known problems, or changes, in ALSA 0.9.0RC5 that could
cause problems on RedHat when used with GnomeMeeting? Can any of you,
with a RedHat, do some tests? What should I do?

Thanks,
-- 
 _	Damien Sandras
(o-	GnomeMeeting: http://www.gnomemeeting.org/
//\	FOSDEM 2003:  http://www.fosdem.org
v_/_	
	H.323 phone:  callto://ils.seconix.com/dsandras@seconix.com




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Re: Alsa 0.9.0 RC5 + RH8 + GnomeMeeting

[Wilfried Weissmann]

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Damien Sandras wrote:
> I subscribed to this mailing list, because GnomeMeeting users have
> reported a problem using ALSA 0.9.0RC5 together with GnomeMeeting and
> RedHat 8.0.
> 
> Actually, the problem is simple to explain, hard to fix, at least for
> me. Several users complained that using GnomeMeeting was freezing their
> machine. This corresponds to a driver bug, somewhere, as "user-space"
> programs can't crash a machine directly. The only particularity of
> GnomeMeeting is that it is reading and writing to the device at the same
> time.

I had similar problems. A patch from Jaroslav Kysela fixed the problem 
for me (see attachment).

> 
> Thanks,

bye,
Wilfried

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===================================================================
RCS file: /cvsroot/alsa/alsa-kernel/core/oss/pcm_oss.c,v
retrieving revision 1.21
retrieving revision 1.22
diff -u -r1.21 -r1.22
--- alsa/alsa-kernel/core/oss/pcm_oss.c	2002/10/21 18:28:20	1.21
+++ alsa/alsa-kernel/core/oss/pcm_oss.c	2002/10/30 20:29:15	1.22
@@ -564,7 +564,15 @@
 		} else {
 			ret = snd_pcm_lib_read(substream, ptr, frames);
 		}
-		if (ret != -EPIPE && ret != -ESTRPIPE)
+		if (ret == -EPIPE) {
+			if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
+				ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, 0);
+				if (ret < 0)
+					break;
+			}
+			continue;
+		}
+		if (ret != -ESTRPIPE)
 			break;
 	}
 	return ret;