linux-kernel - [PATCH -tip] x86: do_IRQ - send EOI for x86-32 on irq without handler

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Message-ID: <20090403185729.GC12273@localhost>
Date:	Fri, 3 Apr 2009 22:57:29 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: [PATCH -tip] x86: do_IRQ - send EOI for x86-32 on irq without
	handler

For X86-32 if IRQ has no handler it remains non-Ack'ed
even if APIC is not requested for being disabled.
Fix it.

Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
CC: Suresh Siddha <suresh.b.siddha@...el.com>
---
 arch/x86/kernel/irq.c |    2 --
 1 file changed, 2 deletions(-)

Index: linux-2.6.git/arch/x86/kernel/irq.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/irq.c
+++ linux-2.6.git/arch/x86/kernel/irq.c
@@ -218,10 +218,8 @@ unsigned int __irq_entry do_IRQ(struct p
 	irq = __get_cpu_var(vector_irq)[vector];
 
 	if (!handle_irq(irq, regs)) {
-#ifdef CONFIG_X86_64
 		if (!disable_apic)
 			ack_APIC_irq();
-#endif
 
 		if (printk_ratelimit())
 			printk(KERN_EMERG "%s: %d.%d No irq handler for vector (irq %d)\n",
--
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