Re: NULL pointer dereference when using ALSA SOC

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Jarkko Nikula wrote:
On Tue, 23 Sep 2008 11:50:53 +0300
"ext Jarkko Nikula" <jarkko.nikula@xxxxxxxxx> wrote:

On Tue, 23 Sep 2008 11:56:00 +0530
"ext Arun KS" <getarunks@xxxxxxxxx> wrote:

Hi all,

I am writing an ASOC driver for tlvaic23 on osk5912 platform.
When do an aplay, I m getting a  NULL pointer dereference. I added
some debug prints in the soc/core/pcm_native.c, also in codec and
platform drivers. The null pointer is comming in IOCTL
SNDRV_PCM_IOCTL_SYNC_PTR. Log is pasted below.

It's good that you can reproduce this on OSK as well.

I think some configuration difference is revealing this bug out. For
instance I can trigger this on Beagle with overo_defconfig + manually
adding support for Beagle (CONFIG_MACH_OMAP3_BEAGLE=y) and ASoC
Beagle (CONFIG_SND_OMAP_SOC_OMAP3_BEAGLE=y).

But I cannot reproduce this with Beagle defconfig + manually adding
support for Overo (CONFIG_MACH_OVERO=y) and ASoC Beagle
(CONFIG_SND_OMAP_SOC_OMAP3_BEAGLE=y).

I narrowed this into CONFIG_SLUB. When it's set, I can reproduce the
bug both with N810 and Beagle but not when using CONFIG_SLAB.

Can you try will the problem disappear on your OSK and Overo if you
select slab allocator instead? You find selection under "General
setup" menu.

I've also verified this works on a Beagle with Angstrom.

Thanks for tracking this down!

Philip



Jarkko
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