Hi Mukesh,

Converts all the return explicit number to a more proper IRQ_HANDLED,
which looks proper incase of interrupt handler returning case.

This looks good to me, but can you describe the effects of those changes
to the interrupt handler's return code? ie, what happened in the
erroneous case where we returned 0 (== IRQ_NONE) - does this fix a
user-visible issue?

Cheers,


Jeremy