linux-kernel - Re: Linux v2.6.18-rc3

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Date:	Wed, 02 Aug 2006 12:41:41 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Hubert Tonneau <hubert.tonneau@...lpliant.org>
Cc:	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: Linux v2.6.18-rc3

At Sun, 30 Jul 2006 17:42:32 GMT,
Hubert Tonneau wrote:
> 
> I've tracked down the USB audio cards not working anymore with 2.6.17 as opposed
> to 2.6.16 to the fact that opening /dev/dsp with O_RDWR works with any USB
> audio card under 2.6.16 whereas starting from 2.6.17 O_WRONLY is mandatory
> if the card has no mic or line in.

Do you really get Oops with 2.6.17-final, too?
AFAIK, there was a bug in the early 2.6.17-rc regarding OSS emulation,
but it got fixed in the later rc.

The behavior of invalid O_* flag seems incompatible with the older
version.  Although I don't think it's totally wrong behavior, surely
better to keep the compatibility.  The patch below should fix it.


Thanks,

Takashi

--- linux-2.6.17.4/sound/core/oss/pcm_oss.c	2006-08-02 12:35:10.000000000 +0200
+++ linux-2.6.17.4/sound/core/oss/pcm_oss.c	2006-08-02 12:36:28.000000000 +0200
@@ -1745,6 +1745,8 @@ static int snd_pcm_oss_open_file(struct 
 	for (idx = 0; idx < 2; idx++) {
 		if (setup[idx].disable)
 			continue;
+		if (! pcm->streams[idx].substream_count)
+			continue; /* no matching substream */
 		if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
 			if (! (f_mode & FMODE_WRITE))
 				continue;
-
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