From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Mack <zonque@gmail.com>
Subject: Re: [PATCH 2/5] ALSA: snd-usb: implement new endpoint
	streaming model
Date: Wed, 21 Dec 2011 17:34:09 +0100
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To: =?ISO-8859-1?Q?Aur=E9lien_Leblond?= <blablack@gmail.com>
Cc: tiwai@suse.de, alsa-devel@alsa-project.org, clemens@ladisch.de, gdiffey@gmail.com, linuxaudio@showlabor.de
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On 12/21/2011 05:16 PM, Aur=E9lien Leblond wrote:
> Hello Daniel,
> =

> I'm now running this new patch with the kernel git 3.2 rc6.
> =

> I do get sound through Alsa and Pulse Audio, but Jackd2 crashes at start.
> The same version of jack works on 3.2 rc4 with your previous version
> of the patch.
> =

> Let me know if there is any other info that I should provide you
> outside the dmesg trace below.
> =

> In dmesg, I get the following:
> [   92.185624] BUG: unable to handle kernel NULL pointer dereference
> at 0000000000000008
> [   92.185637] IP: [<ffffffffa05c9768>]
> snd_usb_endpoint_activate+0x18/0x90 [snd_usb_audio]

Can you do a quick fix and add the following two lines right at the
beginning of snd_usb_endpoint_activate() in sound/usb/endpoint.c:

        if (!ep)
                return 0;

? I'll fix this in a nicer way, but that should work.

Thanks,
Daniel