Re: debugging "irq 7: nobody cared" in my module

[Thomas Andrews <tandrews@grok.co.za>]

On Mon, Jun 05, 2006 at 02:51:32PM +0200, Thomas Andrews wrote:

> What can cause "irq x: nobody cared" ? On exit from my IRQ handler, I am
> checking to make sure that there are no residual/pending unhandled
> events on exit. Here is part of my handler:
> 
> irqreturn_t scx200_acb_irq(int irq_no, void *dev_id, struct pt_regs *regs)
> {
>     struct scx200_acb_iface *iface = dev_id;
>     unsigned long flags;
>     spin_lock_irqsave(lock, flags);
>     if (inb(ACBST)) {
> //      tasklet_schedule(&iface->tasklet);
>         scx200_acb_machine(iface, inb(ACBST));
>         if (iface->state == state_idle)     /* Finished */
>             wake_up_interruptible(&iface->acb_queue);
>     } else {
>         /* Should never get here */
>         printk("causeless IRQ!\n");
>         /* Reset the ACB to clear any pending IRQ */
>         outb((inb(ACBCTL2) & 0xfe), ACBCTL2);
>         outb((inb(ACBCTL2) | 0x01), ACBCTL2);
>     }
>     /* Check to see if some event was not handled */
>     if (inb(ACBST) & 0xBC)
>         printk("============== ACBST=%#x ===============\n",inb(ACBST));
>     spin_unlock_irqrestore(lock, flags);
>     return IRQ_RETVAL(0);
> }

I've found the problem now. The last line is wrong - it should read:

    return IRQ_RETVAL(IRQ_HANDLED);