Debugging uninterruptible sleep causing drivers

Hi,
   Would like some advices on how to debug a driver which causes a
processes to go into
uninterruptible sleep.

Am trying to debug a  bug which makes my video driver to go into
an sleep/busywaiting. (when i do 'ps -l' find a 'D' in the stat field).

99% of the time the driver works,

However when i try to run both the video and the audio driver.(streaming
 audio and video)
The video driver sometimes goes into busywaiting/sleep.

My driver contains lots of spinlocks and semaphores. I have no clue on how to
solve this issues.

Please do advice,

Regards,
sriram
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