linux-kernel - Re: [PATCH] Tell user that stream to be rewound is suspended

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Message-Id: <1249230777.4890.6.camel@localhost.localdomain>
Date:	Sun, 02 Aug 2009 18:32:57 +0200
From:	Lubomir Rintel <lkundrak@...sk>
To:	linux-kernel@...r.kernel.org
Cc:	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Lennart Poettering <mzjro@...inter.net>, stable@...nel.org,
	alsa-devel@...a-project.org
Subject: Re: [PATCH] Tell user that stream to be rewound is suspended

On Sun, 2009-08-02 at 18:14 +0200, Lubomir Rintel wrote:
> Return STRPIPE instead of EBADF when userspace attempts to rewind
> of forward a stream that was suspended in meanwhile, so that it
> can be recovered by snd_pcm_recover().
> 
> This was causing Pulseaudio to unload the ALSA sink module under a race
> condition when it attempted to rewind the stream right after resume from
> suspend, before writing to the stream which would cause it to revive the
> stream otherwise. Tested to work with Pulseaudio patched to attempt to
> snd_pcm_recover() upon receiving an error from snd_pcm_rewind().

The userspace part is filed here:
http://www.pulseaudio.org/ticket/616

-- 
"Excuse all the blood" -- Dead

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