linux-kernel - [PATCH] x86_fixup_irqs: Fix possible missing interrupt handle when disabling CPU

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Message-ID: <27240C0AC20F114CBF8149A2696CBE4A05DFB3@SHSMSX101.ccr.corp.intel.com>
Date:	Mon, 26 Mar 2012 07:11:50 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Yanmin Zhang <yanmin_zhang@...ux.intel.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Subject: [PATCH] x86_fixup_irqs: Fix possible missing interrupt handle when
 disabling CPU

From: liu chuansheng <chuansheng.liu@...el.com>
Subject: [PATCH] x86_fixup_irqs: Fix possible missing interrupt handle when disabling CPU

When preparing to unmask the irq in fixup_irqs(), using irqd_irq_masked()
as the condition to determine if do real unmasking action or not.

Because in some chips, the .irq_disable is NULL, so calling disable_irq()
does not mean the irq is masked immediately, and before enable_irq() if
the irq is coming, it can be pending state. Using irqd_irq_disabled() will
lose this chance.

Signed-off-by: liu chuansheng <chuansheng.liu@...el.com>
---
 arch/x86/kernel/irq.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 6c0802e..b9dd37f 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -277,7 +277,7 @@ void fixup_irqs(void)
                        set_affinity = 0;
 
                if (!irqd_can_move_in_process_context(data) &&
-                   !irqd_irq_disabled(data) && chip->irq_unmask)
+                   !irqd_irq_masked(data) && chip->irq_unmask)
                        chip->irq_unmask(data);
 
                raw_spin_unlock(&desc->lock);
-- 
1.7.0.4
--
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