Thanks everyone for the replies but i think for this trivial problem i don't need to backport the kernel.Anyway now i know the answer for my posted question.I have kept backporting as an excersie as my assignment which i will do in due period of time.

------- Original Message------- Sender: Mark Brownbroonie@opensource.wolfsonmicro.com Date: Apr 20, 2010 01:59 (GMT+09:00) Title: Re: [alsa-devel] No shutdown code in soc-core.c

On Mon, Apr 19, 2010 at 03:10:55PM +0100, Liam Girdwood wrote:

Ah, your kernel is very old. I would just do what you are currently doing with shutdown and use the dev_pm_ops when you upgrade your kernel.

Actually, IME it's probably as easy to just backport current ASoC to 2.6.29 if you're doing anything non-trivial - the backport is very straightforward for most platforms and the benefits of the enhancements in ASoC are well worth the effort.