GPIO IRQ handler called only once

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Hi,
I'm using a 2.6.29rc3 kernel on a custom omap3530 board.  In my
board.c file I configure gpio_10 as an interrupt line, in the driver I
set flags for a falling edge, and when the hardware drops the line
low, I do get the irq handler called in my driver and the entry in
/proc/interrupts is updated from zero to one.  The interrupt handler
does nothing but return IRQ_HANDLED.

A second interrupt from the attached peripheral does not seem to
trigger the handler, though.  Prototype hardware may be causing this,
but is there anything in the gpio/irq infrastructure which requires
that state be cleared other than returning IRQ_HANDLED?

Thanks!
,
John
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