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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 <> 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 <>

--- 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;

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);
spin_unlock_irqrestore(&desc->lock, flags);
return -EBUSY;
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