Re: NULL pointer dereference when using ALSA SOC

Jarkko Nikula
2008-09-23T08:51:17Z

On Tue, 23 Sep 2008 11:56:00 +0530
"ext Arun KS" <getarunks@gmail.com> 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'm using up-to-date l-o with following patches:

Author: Jarkko Nikula <jarkko.nikula@nokia.com>
Date: Fri Sep 19 16:36:38 2008 +0300

ARM: OMAP: Fixes to omap_mcbsp_request function

Author: Jarkko Nikula <jarkko.nikula@nokia.com>
Date: Tue Sep 16 15:56:53 2008 +0300

ARM: OMAP: Add RX/TX interrupts for 2430 and 34xx McBSP ports 3-5

Author: ext Felipe Contreras <felipe.contreras@gmail.com>
Date: Tue Sep 16 23:51:35 2008 +0300

alsa: add Beagleboard SoC configuration.

I don't know is this configuration difference necessarily related to sound since I tried to modify N810 sound configuration similar to Overo defconfig but wasn't able to reproduce. Have to continue hunting.

Jarkko