linux-kernel - [PATCH 2/3] watchdog: Fix sysctl consistency

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Date:	Fri, 28 Jan 2011 11:00:32 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	x86@...nel.org
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Marcin Slusarz <marcin.slusarz@...il.com>,
	Don Zickus <dzickus@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, stable@...nel.org
Subject: [PATCH 2/3] watchdog: Fix sysctl consistency

From: Marcin Slusarz <marcin.slusarz@...il.com>

If it was not possible to enable watchdog for any cpu, switch watchdog_enabled
back to 0, because it's visible via kernel.watchdog sysctl.

Signed-off-by: Marcin Slusarz <marcin.slusarz@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: stable@...nel.org
Signed-off-by: Don Zickus <dzickus@...hat.com>
---
 kernel/watchdog.c |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 7d4213e..38af39a 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -429,9 +429,6 @@ static int watchdog_enable(int cpu)
 		wake_up_process(p);
 	}
 
-	/* if any cpu succeeds, watchdog is considered enabled for the system */
-	watchdog_enabled = 1;
-
 	return 0;
 }
 
@@ -459,12 +456,16 @@ static void watchdog_disable(int cpu)
 static void watchdog_enable_all_cpus(void)
 {
 	int cpu;
-	int result = 0;
+
+	watchdog_enabled = 0;
 
 	for_each_online_cpu(cpu)
-		result += watchdog_enable(cpu);
+		if (!watchdog_enable(cpu))
+			/* if any cpu succeeds, watchdog is considered
+			   enabled for the system */
+			watchdog_enabled = 1;
 
-	if (result)
+	if (!watchdog_enabled)
 		printk(KERN_ERR "watchdog: failed to be enabled on some cpus\n");
 
 }
-- 
1.7.3.4

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