Need Help on howto trace down a soft lock when opening a video0 device

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I am currently creating a camera driver for an omap3530 processor
based on omap3 camera support.  I have it successfully configuring my
camera and /dev/video0 shows up.  However when I try to open the
device using any program( xawtv , cat, etc.)  The system soft locks.
What I am trying to do is put printk s  everywhere to track down the
source of the lock.  Currently I would like to know where in v4l2
would be a good place to add a printk to see it go farther than the
generic open from fnctrl.h.  Or maybe another technique to track down
where the soft lock is occurring

Thanks
John Sarman
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