linux-kernel - [PATCH -v3 2/6] x86, NMI, Add touch_nmi_watchdog to io_check

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Message-Id: <1286606987-19879-2-git-send-email-ying.huang@intel.com>
Date:	Sat,  9 Oct 2010 14:49:43 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Don Zickus <dzickus@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Robert Richter <robert.richter@....com>,
	Huang Ying <ying.huang@...el.com>
Subject: [PATCH -v3 2/6] x86, NMI, Add touch_nmi_watchdog to io_check_error delay

Prevent the long delay in io_check_error make NMI watchdog timeout.

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

--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -344,9 +344,11 @@ io_check_error(unsigned char reason, str
 	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);
--
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