wake_up_interruptible blocks

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Hello,
I've tried to insmod the module which I attached to this file.
On insmod'ing, the module gets stuck on the 

wake_up_interruptible(&timer_queue);

line. If I'm uncommenting this line, everything goes smooth...the timer
runs.
Does somebody know, why the wake_up_interruptible call blocks? What
do I have to do to prevent this? Because I've to wake up processes on every
interrupt.

Best regards,
Juergen

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