[PATCH] watchdog nowayout for acquirewdt

Originally from Matt Domsch.
Adds a nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
From 2.4

drivers/char/acquirewdt.c

@@ -17,6 +17,9 @@
  *
  *	(c) Copyright 1995    Alan Cox <alan@redhat.com>
  *
+ *      14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ *          Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ *          Can't add timeout - driver doesn't allow changing value
  */
 
 #include <linux/config.h>
@@ -50,8 +53,14 @@ static spinlock_t acq_lock;
 #define WDT_STOP 0x43
 #define WDT_START 0x443
 
-#define WD_TIMO (100*60)		/* 1 minute */
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
 
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
 
 /*
  *	Kernel methods.
@@ -126,10 +135,13 @@ static int acq_open(struct inode *inode, struct file *file)
 				spin_unlock(&acq_lock);
 				return -EBUSY;
 			}
+			if (nowayout) {
+				MOD_INC_USE_COUNT;
+			}
 			/*
 			 *	Activate 
 			 */
-	 
+
 			acq_is_open=1;
 			inb_p(WDT_START);      
 			spin_unlock(&acq_lock);
@@ -144,9 +156,9 @@ static int acq_close(struct inode *inode, struct file *file)
 	if(minor(inode->i_rdev)==WATCHDOG_MINOR)
 	{
 		spin_lock(&acq_lock);
-#ifndef CONFIG_WATCHDOG_NOWAYOUT	
-		inb_p(WDT_STOP);
-#endif		
+		if (!nowayout) {
+			inb_p(WDT_STOP);
+		}
 		acq_is_open=0;
 		spin_unlock(&acq_lock);
 	}