On Mon, 2011-08-15 at 16:33 +0530, radhika bhaskaran wrote:

For my debugging purpose i tried to register two isr's on the same
number IRQ no in  the same driver. But the isr which is registerd
first is being hit.

Since the kernel is monolithic is doesn't really matter where your ISR
functions are defined and where these handlers are assigned an IRQ line.

The other isr funciton which is registered after the first isr is
never executed.


Any more suggestions?

Yes, does yours ISR function handlers look if they generated the interrupt and 
if not respond accordingly?
If your device didn't raised the interrupt then they have to return IRQ_NONE. 
If your hardware raised the interrupt then you have to do the processing and 
return IRQ_HANDLED.

So you have to do something like this:

static irqreturn_t my_interrupt(int irq, void *data)
{
        int result;
        struct my_device *my_dev = data;

        result = check_interrupt_raised(my_dev);

        if (!result)
           return IRQ_NONE;

	process_interrupt(my_dev);
        return IRQ_HANDLED;
}

Hope it helps,
Javier Martinez Canillas