[alsa-devel] Backported sbxfi driver (UNTESTED!)

[Takashi Iwai]

At Thu, 23 Oct 2008 15:23:24 +0100,
Jason Harvey wrote:
> 
> Takashi Iwai wrote:
> > What is the last kernel message from sbxfi driver?
> > Usually it prints some messages (as debug=1 as default).
> >
> >   
> 
> I applied the patch and when trying "mplayer wn.wav" I consistently get 
> the following message on the console
> 
> PANIC: double fault, gdt at c13f6000 [255 bytes]
> 
> nothing else, either reboots instantly or locks up.
> 
> In case you might find it of use I modprobed at debug=3 and ran dmesg 
> before I ran mplayer. Output attached.

Thanks.

The last entries are:

> SBXFI: Setting TLB buffer page 0x1daff000
> SBXFI:   write(0) 0x13b004 = 0x1daff000
> SBXFI:   write(0) 0x13b000 = 0x0

Hm, this smells like a buffer handling issue.

I updated the sbxfi driver code now, added mutex around the code
handling TLB pages.
Please give it a try.


Takashi