From mboxrd@z Thu Jan  1 00:00:00 1970
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
Subject: Re: [PATCH 00/14] SPDIF support
Date: Mon, 2 Sep 2013 15:52:08 +0100
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To: Mark Brown <broonie@kernel.org>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Andrew Lunn <andrew@lunn.ch>, alsa-devel@alsa-project.org, Lars-Peter Clausen <lars@metafoo.de>, Jason Cooper <jason@lakedaemon.net>, Jean-Francois Moine <moinejf@free.fr>, Takashi Iwai <tiwai@suse.de>, Liam Girdwood <lgirdwood@gmail.com>, linux-arm-kernel@lists.infradead.org, Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
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On Mon, Sep 02, 2013 at 03:47:13PM +0100, Mark Brown wrote:
> On Sat, Aug 31, 2013 at 08:34:31PM +0100, Russell King - ARM Linux wrote:
> > And here's the oops:
> 
> > Aug 10 22:06:17 cubox kernel: [<c030f724>] (snd_pcm_info+0xc8/0xd8) from [<c030f768>] (snd_pcm_info_user+0x34/0x9c)
> > Aug 10 22:06:17 cubox kernel: [<c030f768>] (snd_pcm_info_user+0x34/0x9c) from [<c030a67c>] (snd_pcm_control_ioctl+0x274/0x280)
> 
> > This is caused because substream->ops is NULL.  Why that's the case,
> > I don't know, but I believe the PCM which is trying to be operated on
> > is the one registered against the backend (by snd_pcm_new_internal).
> 
> Liam did provide you with a workaround for this one along with a
> suggested proper fix.  Have you had any success in using this
> workaround, or with implementing the proper fix for that matter?  I
> don't recall seeing any feedback on the results but perhaps I missed it.

I am not aware of any such patch.