MX21 keypad driver interrupt issue

hi all,
i writing keypad driver on

*mx21 ads board  for
* kernel 2.6.14

i got a problem on interrupt handling ,

the isr routine for kpp

1.when interrupt occur first i disable interrupt by clear KRIE and KDIE bit

2.next i scan key pad matrix

3.clear KPDK bit  (but when i read this bit i can see that KPDK flag
bit is still not cleared)

4.then i enable KDIE bit again

all above 1,2,3,4 written within interrupt handler (is this a problem?);

my problem is KPP interrupt handler run over and over again after once
i touch a key and release it
please help
thanks

dilan
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