linux-kernel - "scheduling while atomic" bug in SBC-FITPC2 watchdog

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Date:	Thu, 22 Apr 2010 19:54:20 +0300
From:	Denis Turischev <denis@...pulab.co.il>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	Wim Van Sebroeck <wim@...ana.be>,
	Andrey Panin <pazke@...trinvest.ru>
Subject: "scheduling while atomic" bug in SBC-FITPC2 watchdog

sbc_fitpc2_wdt: fixed "scheduling while atomic" bug.

speenlock need to be replaced by mutex because of sleep functions
inside wdt_send_data.

Signed-off-by: Denis Turischev <denis@...pulab.co.il>
---
 drivers/watchdog/sbc_fitpc2_wdt.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/watchdog/sbc_fitpc2_wdt.c b/drivers/watchdog/sbc_fitpc2_wdt.c
index 226f0f2..23da5cb 100644
--- a/drivers/watchdog/sbc_fitpc2_wdt.c
+++ b/drivers/watchdog/sbc_fitpc2_wdt.c
@@ -30,7 +30,7 @@
 static int nowayout = WATCHDOG_NOWAYOUT;
 static unsigned int margin = 60;	/* (secs) Default is 1 minute */
 static unsigned long wdt_status;
-static DEFINE_SPINLOCK(wdt_lock);
+static DEFINE_MUTEX(wdt_lock);

 #define WDT_IN_USE		0
 #define WDT_OK_TO_CLOSE		1
@@ -53,18 +53,18 @@ static void wdt_send_data(unsigned char command, unsigned char data)

 static void wdt_enable(void)
 {
-	spin_lock(&wdt_lock);
+	mutex_lock(&wdt_lock);
 	wdt_send_data(IFACE_ON_COMMAND, 1);
 	wdt_send_data(REBOOT_COMMAND, margin);
-	spin_unlock(&wdt_lock);
+	mutex_unlock(&wdt_lock);
 }

 static void wdt_disable(void)
 {
-	spin_lock(&wdt_lock);
+	mutex_lock(&wdt_lock);
 	wdt_send_data(IFACE_ON_COMMAND, 0);
 	wdt_send_data(REBOOT_COMMAND, 0);
-	spin_unlock(&wdt_lock);
+	mutex_unlock(&wdt_lock);
 }

 static int fitpc2_wdt_open(struct inode *inode, struct file *file)
--
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