linux-kernel - [PATCH] kernel: shut up the IRQ mismatch messages (Re: wbsd: IRQ handler type mismatch)

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Date:	Tue, 6 Feb 2007 11:30:23 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Robert Hancock <hancockr@...w.ca>, akpm@...l.org
Cc:	linux-kernel <linux-kernel@...r.kernel.org>, drzeus-wbsd@...eus.cx,
	wbsd-devel@...t.drzeus.cx
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@...w.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@...hat.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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