linux-kernel - [PATCH 2/9] x86, NMI: Add touch_nmi_watchdog to io_check

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Message-Id: <1291156050-4482-3-git-send-email-dzickus@redhat.com>
Date:	Tue, 30 Nov 2010 17:27:23 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Robert Richter <robert.richter@....com>, ying.huang@...el.com,
	Andi Kleen <andi@...stfloor.org>, gorcunov@...il.com,
	LKML <linux-kernel@...r.kernel.org>,
	Don Zickus <dzickus@...hat.com>
Subject: [PATCH 2/9] x86, NMI: Add touch_nmi_watchdog to io_check_error delay

From: Huang Ying <ying.huang@...el.com>

Prevent the long delay in io_check_error making NMI watchdog timeout.

Signed-off-by: Huang Ying <ying.huang@...el.com>
Signed-off-by: Don Zickus <dzickus@...hat.com>
---
 arch/x86/kernel/traps.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 10a43f5..c7fd1ce 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -353,9 +353,11 @@ io_check_error(unsigned char reason, struct pt_regs *regs)
 	reason = (reason & NMI_REASON_CLEAR_MASK) | NMI_REASON_CLEAR_IOCHK;
 	outb(reason, NMI_REASON_PORT);
 
-	i = 2000;
-	while (--i)
-		udelay(1000);
+	i = 20000;
+	while (--i) {
+		touch_nmi_watchdog();
+		udelay(100);
+	}
 
 	reason &= ~NMI_REASON_CLEAR_IOCHK;
 	outb(reason, NMI_REASON_PORT);
-- 
1.7.3.2

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