Re: [Alsa-devel] 2.6.15-rc6: boot failure in saa7134-alsa.c

[Sergey Vlasov <vsu@altlinux.ru>]

On Tue, Dec 20, 2005 at 02:18:10PM +0100, Adrian Bunk wrote:
> 2.6.15-rc6 doesn't boot on my computer with an Oops that has 
> drivers/media/video/saa7134/saa7134-alsa.c prominently in it's trace.
> 
> A picture of the Oops is at [1] (I won't get a price for the best 
> picture for it, but it's readable...).

saa7134-alsa is trying to initialize before the ALSA core has initialized.
Probably no one has tested CONFIG_VIDEO_SAA7134=y.

There is some more brokenness there:

1) With CONFIG_VIDEO_SAA7134=y, both saa7134-alsa.o and saa7134-oss.o will
be built into the kernel, but only the first of them has any chance to be
used - the second will stay as dead code.

2) Both saa7134-alsa and saa7134-oss set dmasound_init and dmasound_exit
function pointers to their functions (for handling of saa7134 cards
hotplugged later), but they do not reset these pointers on unload -
therefore if you load one of these modules, then unload it, then try to
hotplug a saa7134-based card (apparently there are CardBus
implementation), you will get oopses.  These assignments in saa7134-alsa
and saa7134-oss also stomp on each other.

> Kernels up to 2.6.14.4 boot fine, 2.6.15-rc1 is the one that introduced 
> the problem.
> 
> I must give saa7134.card=6 at the lilo prompt for getting my card 
> working.

-ECHEAPHARDWARE (sadly, boards without EEPROM are too common).

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