Re: Alsa 0.9.0 RC5 + RH8 + GnomeMeeting

[Wilfried Weissmann <Wilfried.Weissmann@gmx.at>]

[-- Attachment #1: Type: text/plain, Size: 677 bytes --]

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

[-- Attachment #2: pcm_oss.c.diff --]
[-- Type: text/plain, Size: 724 bytes --]

===================================================================
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;