Problem on Interrupt Handling

[Venu Gopal Krishna Vemula]

Hi,
         I am developing  a linux device driver for a 
serial communication adapter which is based on
interrrupt driven IO, top half handles registering the
Immediate task queue, bottom half performs the actual
task

     But after some time 'RxFull' interrupts are not
comming. This is happening after I got an interrupt
which tells "CPU not responding,  RFIFO is FULL". 
		ALl other types  interrupts(includes TxEmpty and
Modem interrupts) are Ok... The above problem is
solving when  ISR0 (interrupt status register which
contains  RXtype interrupts) and enable ISR0, RxFull
interrupt is again comming .

     In my UART(Serial communication Controller,) 
RxFull has high priority and then TxEmpty.Both RxFull
and TxEmpty share same IRQ line. No other device is
sharing the IRQ line. 

I would appreciate if you can help solving this
problem.

regards,
[e-mail]

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