linux-kernel - Re: [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoi type IRQ handlers

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Date:	Mon, 20 Nov 2006 20:11:49 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	dwalker@...sta.com
Subject: Re: [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoi type IRQ handlers


* Ingo Molnar <mingo@...e.hu> wrote:

> >    Hmm, that just won't do for PPC threaded fasteoi flows! What you'll 
> > get is a threaded IRQ with EOI *never ever* issued, unless my PPC 
> > patch is also in...
> 
> ok, how about the patch below in addition?

or rather, the one below. Untested.

	Ingo

Index: linux/kernel/irq/chip.c
===================================================================
--- linux.orig/kernel/irq/chip.c
+++ linux/kernel/irq/chip.c
@@ -392,11 +394,12 @@ handle_fasteoi_irq(unsigned int irq, str
 	desc->status |= IRQ_INPROGRESS;
 
 	/*
-	 * In the threaded case we fall back to a mask+ack sequence:
+	 * In the threaded case we fall back to a mask+eoi sequence:
 	 */
 	if (redirect_hardirq(desc)) {
-		mask_ack_irq(desc, irq);
-		goto out_unlock;
+		if (desc->chip->mask)
+			desc->chip->mask(irq);
+		goto out;
 	}
 
 	desc->status &= ~IRQ_PENDING;
-
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