On Friday 18 February 2011, Thomas Gleixner wrote:

On Fri, 18 Feb 2011, Arnd Bergmann wrote:

quoted

On Friday 18 February 2011, Pratheesh Gangadhar wrote:

quoted

Signed-off-by: Pratheesh Gangadhar <redacted>
+static irqreturn_t pruss_handler(int irq, struct uio_info *dev_info)
+{
+   return IRQ_HANDLED;
+}

An empty interrupt handler is rather pointless. I guess you really
notify user space when the interrupt handler gets called, as this
is the main point of a UIO driver as far as I understand it.

The UIO core code does this for you when the driver handler returns
IRQ_HANDLED

Ah, right.

but the empty handler raises a different questions:

Is the interrupt edge triggerd or how do you avoid an irq storm here?
Usually UIO drivers are requested to mask the interrupt in the device
itself.

If it's edge triggered, it should not advertise IRQF_SHARED, right?

	Arnd