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    Subject[PATCH] kernel: shut up the IRQ mismatch messages (Re: wbsd: IRQ handler type mismatch)
    On Mon, 05 Feb 2007 21:16:59 -0600
    Robert Hancock <hancockr@shaw.ca> wrote:

    > I'm seeing this on bootup on my laptop with recent kernels (currently
    > 2.6.20-rc6-mm3):

    The problem is various drivers legally validly and sensibly try to claim
    IRQs but the kernel insists on vomiting forth a giant irrelevant
    debugging spew when the types clash.

    Edit kernel/irq/manage.c go down to mismatch: in setup_irq() and ifdef
    out the if clause that checks for mismatches. It'll then just do the
    right thing and work sanely.

    For the current -mm kernel this will do the trick (and moves it into
    shared irq debugging as in debug mode the info spew is useful). I've had
    a variant of this in my private tree for some time as I got fed up on the
    mess on boxes where old legacy IRQs get reused.

    Signed-off-by: Alan Cox <alan@redhat.com>

    --- linux.vanilla-2.6.20-rc6-mm3/kernel/irq/manage.c 2007-01-31 14:20:43.000000000 +0000
    +++ linux-2.6.20-rc6-mm3/kernel/irq/manage.c 2007-02-06 11:01:00.796928504 +0000
    @@ -372,12 +372,14 @@
    return 0;

    mismatch:
    +#ifdef CONFIG_DEBUG_SHIRQ
    if (!(new->flags & IRQF_PROBE_SHARED)) {
    printk(KERN_ERR "IRQ handler type mismatch for IRQ %d\n", irq);
    if (old_name)
    printk(KERN_ERR "current handler: %s\n", old_name);
    dump_stack();
    }
    +#endif
    spin_unlock_irqrestore(&desc->lock, flags);
    return -EBUSY;
    }
    -
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