On 05/29/2015 12:53 PM, Fu Wei wrote:

If this interrupter is triggered, that means system has goes wrong,
who knows what is wrong ,
I have to make sure that  system get into that routine ,because of the
WS0, if not I won't do panic.

But the interrupt handler is not registered as shared, which means that 
it cannot be generated by another device.

And in a interrupter routine , checking the Interrupter status
register is right way to do.

If you get an interrupt, but WS0 is not set, then you should return 
IRQ_NONE instead of IRQ_HANDLED.

Also, I don't think IRQF_TIMER is correct.  It's not a timer interrupt. 
  Watchdogs are *not* timers.

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