problem in configuring PC13 for Ext interrupt

Hi 

I myself is working on PPC 8272, There i am facing a serious problem . The
problem is this :-

I have configured PC13 for an external Interrupt In the Init of the driver.
The configuration is OK, but when ever i press a key from the key board i
use to get an an interrupt from PC13 (The handler is being called )
regardless of whether the interrupt is comming or not.

Please send me ur suggessions for this unpredictible issue.

regard 
Misbah
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