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

[Michael Buesch <mb@bu3sch.de>]

On Monday 05 June 2006 18:11, Thomas Andrews wrote:
> 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);

No, either
return IRQ_HANDLED;
or
return IRQ_RETVAL(boolean);

You returned the boolean 0, which is "false".

-- 
Greetings Michael.