[alsa-devel] NULL pointer dereference in ALSA triggered through saa7134-alsa

[Takashi Iwai]

At Mon, 10 Aug 2009 18:42:20 +0300,
Ozan Çağlayan wrote:
> 
> Takashi Iwai wrote:
> > At Mon, 10 Aug 2009 16:50:55 +0300,
> > Ozan Çağlayan wrote:
> >   
> >> Hi,
> >>
> >> I've finally succesfully compiled and linked saa7134-alsa driver using
> >> an external alsa-driver and its Module.symvers file. Everything seems
> >> okay, no undefined symbol or something else:
> >>
> >> - An installed 2.6.30.4 kernel which only builds and brings soundcore
> >> and sound_firmware,
> >> - Latest alsa-driver built externally and installed,
> >> - Latest saa7134-alsa, cx88-alsa, etc. code from linus-2.6 (seen that
> >> they don't affected by some API/ABI changes) patched on top of the
> >> alsa-driver tarball,
> >>     
> >
> > The external drivers using ALSA API have to be built with the
> > newer ALSA header files from alsa-driver tree.  It's not enough to
> > change snd_card_new() with snd_card_create().  The core structure
> > was changed, so the whole build has to be adjusted, too.
> >   
> Actually that was the 0th step that I forgot to mention. I'm installing
> the headers from the alsa-driver snapshot into /usr/include/sound and
> then I build alsa-driver. Then I use the symvers from the alsa-driver
> build alltogether with the headers that I've already installed into
> /usr/include/sound to build the V4L ones.

But /usr/include/sound isn't used for building kernel modules normally.
Unless any hack is added, these files have to be installed to the
kernel header directory.


Takashi