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Subject[PATCH] [2.4.20-pre1] Watchdog Stuff (2/4)
	The second part of the patch, adding Matt Domsch's nowayout code
to various watchdog drivers.

Joel

diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/acquirewdt.c linux-2.4.20-pre1-nowayout/drivers/char/acquirewdt.c
--- linux-2.4.20-pre1-settimeout/drivers/char/acquirewdt.c Fri Aug 2 17:39:43 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/acquirewdt.c Wed Aug 7 15:30:18 2002
@@ -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 @@
#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 +135,12 @@
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);
@@ -145,9 +156,9 @@
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);
}
diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/advantechwdt.c linux-2.4.20-pre1-nowayout/drivers/char/advantechwdt.c
--- linux-2.4.20-pre1-settimeout/drivers/char/advantechwdt.c Fri Aug 2 17:39:43 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/advantechwdt.c Wed Aug 7 15:30:18 2002
@@ -20,6 +20,8 @@
*
* (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
*/

#include <linux/config.h>
@@ -57,6 +59,15 @@

static int wd_margin = 60; /* 60 sec default timeout */

+#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.
*/
@@ -108,16 +119,16 @@
return -ESPIPE;

if (count) {
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- size_t i;
+ if (!nowayout) {
+ size_t i;

- adv_expect_close = 0;
+ adv_expect_close = 0;

- for (i = 0; i != count; i++) {
- if (buf[i] == 'V')
- adv_expect_close = 42;
+ for (i = 0; i != count; i++) {
+ if (buf[i] == 'V')
+ adv_expect_close = 42;
+ }
}
-#endif
advwdt_ping();
}
return count;
diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/alim7101_wdt.c linux-2.4.20-pre1-nowayout/drivers/char/alim7101_wdt.c
--- linux-2.4.20-pre1-settimeout/drivers/char/alim7101_wdt.c Fri Aug 2 17:39:43 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/alim7101_wdt.c Wed Aug 7 15:30:18 2002
@@ -79,6 +79,15 @@
static int wdt_expect_close;
static struct pci_dev *alim7101_pmu;

+#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)");
+
/*
* Whack the dog
*/
@@ -157,16 +166,18 @@
/* See if we got the magic character */
if(count)
{
- size_t ofs;
+ if (!nowayout) {
+ size_t ofs;

- /* note: just in case someone wrote the magic character
- * five months ago... */
- wdt_expect_close = 0;
-
- /* now scan */
- for(ofs = 0; ofs != count; ofs++)
- if(buf[ofs] == 'V')
- wdt_expect_close = 1;
+ /* note: just in case someone wrote the magic
+ * character five months ago... */
+ wdt_expect_close = 0;
+
+ /* now scan */
+ for(ofs = 0; ofs != count; ofs++)
+ if(buf[ofs] == 'V')
+ wdt_expect_close = 1;
+ }

/* someone wrote to us, we should restart timer */
next_heartbeat = jiffies + WDT_HEARTBEAT;
@@ -193,15 +204,11 @@

static int fop_close(struct inode * inode, struct file * file)
{
-#ifdef CONFIG_WDT_NOWAYOUT
if(wdt_expect_close)
wdt_turnoff();
else {
printk(OUR_NAME ": device file closed unexpectedly. Will not stop the WDT!\n");
}
-#else
- wdt_turnoff();
-#endif
clear_bit(0, &wdt_is_open);
return 0;
}
diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/eurotechwdt.c linux-2.4.20-pre1-nowayout/drivers/char/eurotechwdt.c
--- linux-2.4.20-pre1-settimeout/drivers/char/eurotechwdt.c Fri Aug 2 17:39:43 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/eurotechwdt.c Wed Aug 7 15:30:18 2002
@@ -35,6 +35,9 @@
*
* 2001 - Rodolfo Giometti
* Initial release
+ *
+ * 2002.05.30 - Joel Becker <joel.becker@oracle.com>
+ * Added Matt Domsch's nowayout module option.
*/

#include <linux/config.h>
@@ -68,6 +71,14 @@

#define WDT_TIMEOUT 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)");

/*
* Some symbolic names
@@ -220,16 +231,16 @@
return -ESPIPE;

if (count) {
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- size_t i;
+ if (!nowayout) {
+ size_t i;

- eur_expect_close = 0;
+ eur_expect_close = 0;

- for (i = 0; i != count; i++) {
- if (buf[i] == 'V')
- eur_expect_close = 42;
+ for (i = 0; i != count; i++) {
+ if (buf[i] == 'V')
+ eur_expect_close = 42;
+ }
}
-#endif
eurwdt_ping(); /* the default timeout */
}

diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/ib700wdt.c linux-2.4.20-pre1-nowayout/drivers/char/ib700wdt.c
--- linux-2.4.20-pre1-settimeout/drivers/char/ib700wdt.c Mon Feb 25 11:37:57 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/ib700wdt.c Wed Aug 7 15:30:18 2002
@@ -114,6 +114,15 @@

static int wd_margin = WD_TIMO;

+#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.
@@ -222,9 +231,9 @@
lock_kernel();
if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
spin_lock(&ibwdt_lock);
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- outb_p(wd_times[wd_margin], WDT_STOP);
-#endif
+ if (!nowayout) {
+ outb_p(wd_times[wd_margin], WDT_STOP);
+ }
ibwdt_is_open = 0;
spin_unlock(&ibwdt_lock);
}
diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/indydog.c linux-2.4.20-pre1-nowayout/drivers/char/indydog.c
--- linux-2.4.20-pre1-settimeout/drivers/char/indydog.c Fri Aug 2 17:39:43 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/indydog.c Wed Aug 7 15:30:18 2002
@@ -27,6 +27,15 @@
static unsigned long indydog_alive;
static struct sgimc_misc_ctrl *mcmisc_regs;

+#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)");
+
static void indydog_ping()
{
mcmisc_regs->watchdogt = 0;
@@ -43,9 +52,9 @@

if( test_and_set_bit(0,&indydog_alive) )
return -EBUSY;
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
- MOD_INC_USE_COUNT;
-#endif
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
/*
* Activate timer
*/
@@ -63,16 +72,15 @@
{
/*
* Shut off the timer.
- * Lock it in if it's a module and we defined ...NOWAYOUT
+ * Lock it in if it's a module and we set nowayout.
*/
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout)
{
- u32 mc_ctrl0 = mcmisc_regs->cpuctrl0;
- mc_ctrl0 &= ~SGIMC_CCTRL0_WDOG;
- mcmisc_regs->cpuctrl0 = mc_ctrl0;
- printk("Stopped watchdog timer.\n");
+ u32 mc_ctrl0 = mcmisc_regs->cpuctrl0;
+ mc_ctrl0 &= ~SGIMC_CCTRL0_WDOG;
+ mcmisc_regs->cpuctrl0 = mc_ctrl0;
+ printk("Stopped watchdog timer.\n");
}
-#endif
clear_bit(0,&indydog_alive);
return 0;
}
diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/machzwd.c linux-2.4.20-pre1-nowayout/drivers/char/machzwd.c
--- linux-2.4.20-pre1-settimeout/drivers/char/machzwd.c Fri Aug 2 17:39:43 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/machzwd.c Wed Aug 7 15:30:18 2002
@@ -24,6 +24,8 @@
* a system RESET and it starts wd#2 that unconditionaly will RESET
* the system when the counter reaches zero.
*
+ * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
*/

#include <linux/config.h>
@@ -103,6 +105,15 @@
MODULE_PARM(action, "i");
MODULE_PARM_DESC(action, "after watchdog resets, generate: 0 = RESET(*) 1 = SMI 2 = NMI 3 = SCI");

+#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)");
+
#define PFX "machzwd"

static struct watchdog_info zf_info = {
@@ -303,27 +314,27 @@
/* See if we got the magic character */
if(count){

-/*
- * no need to check for close confirmation
- * no way to disable watchdog ;)
- */
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- size_t ofs;
-
- /*
- * note: just in case someone wrote the magic character
- * five months ago...
+ /*
+ * no need to check for close confirmation
+ * no way to disable watchdog ;)
*/
- zf_expect_close = 0;
+ if (!nowayout) {
+ size_t ofs;

- /* now scan */
- for(ofs = 0; ofs != count; ofs++){
- if(buf[ofs] == 'V'){
- zf_expect_close = 1;
- dprintk("zf_expect_close 1\n");
+ /*
+ * note: just in case someone wrote the magic
+ * character five months ago...
+ */
+ zf_expect_close = 0;
+
+ /* now scan */
+ for(ofs = 0; ofs != count; ofs++){
+ if(buf[ofs] == 'V'){
+ zf_expect_close = 1;
+ dprintk("zf_expect_close 1\n");
+ }
}
}
-#endif
/*
* Well, anyhow someone wrote to us,
* we should return that favour
@@ -381,9 +392,9 @@
return -EBUSY;
}

-#ifdef CONFIG_WATCHDOG_NOWAYOUT
- MOD_INC_USE_COUNT;
-#endif
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
zf_is_open = 1;

spin_unlock(&zf_lock);
diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/mixcomwd.c linux-2.4.20-pre1-nowayout/drivers/char/mixcomwd.c
--- linux-2.4.20-pre1-settimeout/drivers/char/mixcomwd.c Thu Sep 13 15:21:32 2001
+++ linux-2.4.20-pre1-nowayout/drivers/char/mixcomwd.c Wed Aug 7 15:30:18 2002
@@ -27,10 +27,13 @@
*
* Version 0.4 (99/11/15):
* - support for one more type board
+ *
+ * Version 0.5 (2001/12/14) Matt Domsch <Matt_Domsch@dell.com>
+ * - added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
*
*/

-#define VERSION "0.4"
+#define VERSION "0.5"

#include <linux/module.h>
#include <linux/config.h>
@@ -58,25 +61,30 @@

static int watchdog_port;

-#ifndef CONFIG_WATCHDOG_NOWAYOUT
static int mixcomwd_timer_alive;
static struct timer_list mixcomwd_timer;
+
+#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)");
+
static void mixcomwd_ping(void)
{
outb_p(55,watchdog_port);
return;
}

-#ifndef CONFIG_WATCHDOG_NOWAYOUT
static void mixcomwd_timerfun(unsigned long d)
{
mixcomwd_ping();

mod_timer(&mixcomwd_timer,jiffies+ 5*HZ);
}
-#endif

/*
* Allow only one person to hold it open
@@ -89,12 +97,13 @@
}
mixcomwd_ping();

-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
if(mixcomwd_timer_alive) {
del_timer(&mixcomwd_timer);
mixcomwd_timer_alive=0;
}
-#endif
return 0;
}

@@ -102,19 +111,19 @@
{

lock_kernel();
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- if(mixcomwd_timer_alive) {
- printk(KERN_ERR "mixcomwd: release called while internal timer alive");
- unlock_kernel();
- return -EBUSY;
+ if (!nowayout) {
+ if(mixcomwd_timer_alive) {
+ printk(KERN_ERR "mixcomwd: release called while internal timer alive");
+ unlock_kernel();
+ return -EBUSY;
+ }
+ init_timer(&mixcomwd_timer);
+ mixcomwd_timer.expires=jiffies + 5 * HZ;
+ mixcomwd_timer.function=mixcomwd_timerfun;
+ mixcomwd_timer.data=0;
+ mixcomwd_timer_alive=1;
+ add_timer(&mixcomwd_timer);
}
- init_timer(&mixcomwd_timer);
- mixcomwd_timer.expires=jiffies + 5 * HZ;
- mixcomwd_timer.function=mixcomwd_timerfun;
- mixcomwd_timer.data=0;
- mixcomwd_timer_alive=1;
- add_timer(&mixcomwd_timer);
-#endif

clear_bit(0,&mixcomwd_opened);
unlock_kernel();
@@ -148,9 +157,9 @@
{
case WDIOC_GETSTATUS:
status=mixcomwd_opened;
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- status|=mixcomwd_timer_alive;
-#endif
+ if (!nowayout) {
+ status|=mixcomwd_timer_alive;
+ }
if (copy_to_user((int *)arg, &status, sizeof(int))) {
return -EFAULT;
}
@@ -255,14 +264,14 @@

static void __exit mixcomwd_exit(void)
{
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- if(mixcomwd_timer_alive) {
- printk(KERN_WARNING "mixcomwd: I quit now, hardware will"
- " probably reboot!\n");
- del_timer(&mixcomwd_timer);
- mixcomwd_timer_alive=0;
+ if (!nowayout) {
+ if(mixcomwd_timer_alive) {
+ printk(KERN_WARNING "mixcomwd: I quit now, hardware will"
+ " probably reboot!\n");
+ del_timer(&mixcomwd_timer);
+ mixcomwd_timer_alive=0;
+ }
}
-#endif
release_region(watchdog_port,1);
misc_deregister(&mixcomwd_miscdev);
}
diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/sc1200wdt.c linux-2.4.20-pre1-nowayout/drivers/char/sc1200wdt.c
--- linux-2.4.20-pre1-settimeout/drivers/char/sc1200wdt.c Fri Aug 2 17:39:43 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/sc1200wdt.c Wed Aug 7 15:30:18 2002
@@ -22,6 +22,8 @@
* <rob@osinvestor.com> Return proper status instead of temperature warning
* Add WDIOC_GETBOOTSTATUS and WDIOC_SETOPTIONS ioctls
* Fix CONFIG_WATCHDOG_NOWAYOUT
+ * 20020530 Joel Becker Add Matt Domsch's nowayout
+ * module option
*/

#include <linux/config.h>
@@ -86,6 +88,14 @@
MODULE_PARM(timeout, "i");
MODULE_PARM_DESC(timeout, "range is 0-255 minutes, default is 1");

+#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)");


/* Read from Data Register */
@@ -246,17 +256,17 @@
return -ESPIPE;

if (len) {
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- size_t i;
+ if (!nowayout) {
+ size_t i;

- expect_close = 0;
+ expect_close = 0;

- for (i = 0; i != len; i++)
- {
- if (data[i] == 'V')
- expect_close = 42;
+ for (i = 0; i != len; i++)
+ {
+ if (data[i] == 'V')
+ expect_close = 42;
+ }
}
-#endif
sc1200wdt_write_data(WDTO, timeout);
return len;
}
diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/sc520_wdt.c linux-2.4.20-pre1-nowayout/drivers/char/sc520_wdt.c
--- linux-2.4.20-pre1-settimeout/drivers/char/sc520_wdt.c Fri Aug 2 17:39:43 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/sc520_wdt.c Wed Aug 7 15:30:18 2002
@@ -110,6 +110,15 @@
static unsigned long wdt_is_open;
static int wdt_expect_close;

+#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)");
+
static spinlock_t wdt_spinlock;
/*
* Whack the dog
@@ -172,12 +181,12 @@

static void wdt_turnoff(void)
{
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- /* Stop the timer */
- del_timer(&timer);
- wdt_config(0);
- printk(OUR_NAME ": Watchdog timer is now disabled...\n");
-#endif
+ if (!nowayout) {
+ /* Stop the timer */
+ del_timer(&timer);
+ wdt_config(0);
+ printk(OUR_NAME ": Watchdog timer is now disabled...\n");
+ }
}


@@ -222,9 +231,9 @@
return -EBUSY;
/* Good, fire up the show */
wdt_startup();
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
- MOD_INC_USE_COUNT;
-#endif
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
return 0;
default:
return -ENODEV;
diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/softdog.c linux-2.4.20-pre1-nowayout/drivers/char/softdog.c
--- linux-2.4.20-pre1-settimeout/drivers/char/softdog.c Fri Aug 2 17:39:43 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/softdog.c Wed Aug 7 15:30:18 2002
@@ -31,6 +31,9 @@
* Added soft_noboot; Allows testing the softdog trigger without
* requiring a recompile.
* Added WDIOC_GETTIMEOUT and WDIOC_SETTIMOUT.
+ *
+ * 20020530 Joel Becker <joel.becker@oracle.com>
+ * Added Matt Domsch's nowayout module option.
*/

#include <linux/module.h>
@@ -59,6 +62,15 @@
MODULE_PARM(soft_noboot,"i");
MODULE_LICENSE("GPL");

+#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)");
+
/*
* Our timer
*/
@@ -95,9 +107,9 @@
{
if(test_and_set_bit(0, &timer_alive))
return -EBUSY;
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
- MOD_INC_USE_COUNT;
-#endif
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
/*
* Activate timer
*/
@@ -109,11 +121,11 @@
{
/*
* Shut off the timer.
- * Lock it in if it's a module and we defined ...NOWAYOUT
+ * Lock it in if it's a module and we set nowayout
*/
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- del_timer(&watchdog_ticktock);
-#endif
+ if (!nowayout) {
+ del_timer(&watchdog_ticktock);
+ }
clear_bit(0, &timer_alive);
return 0;
}
diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/wafer5823wdt.c linux-2.4.20-pre1-nowayout/drivers/char/wafer5823wdt.c
--- linux-2.4.20-pre1-settimeout/drivers/char/wafer5823wdt.c Wed Aug 7 15:24:03 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/wafer5823wdt.c Wed Aug 7 15:30:18 2002
@@ -56,6 +56,15 @@
#define WD_TIMO 60 /* 1 minute */
static int wd_margin = WD_TIMO;

+#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)");
+
static void wafwdt_ping(void)
{
/* pat watchdog */
@@ -148,9 +157,9 @@
wafwdt_close(struct inode *inode, struct file *file)
{
clear_bit(0, &wafwdt_is_open);
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- wafwdt_stop();
-#endif
+ if (!nowayout) {
+ wafwdt_stop();
+ }
return 0;
}

diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/wdt.c linux-2.4.20-pre1-nowayout/drivers/char/wdt.c
--- linux-2.4.20-pre1-settimeout/drivers/char/wdt.c Fri Aug 2 17:39:43 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/wdt.c Wed Aug 7 15:30:18 2002
@@ -28,6 +28,7 @@
* Parameterized timeout
* Tigran Aivazian : Restructured wdt_init() to handle failures
* Joel Becker : Added WDIOC_GET/SETTIMEOUT
+ * Matt Domsch : Added nowayout module option
*/

#include <linux/config.h>
@@ -66,6 +67,15 @@

static int wd_margin = WD_TIMO;

+#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)");
+
#ifndef MODULE

/**
@@ -394,10 +404,10 @@
{
if(MINOR(inode->i_rdev)==WATCHDOG_MINOR)
{
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- inb_p(WDT_DC); /* Disable counters */
- wdt_ctr_load(2,0); /* 0 length reset pulses now */
-#endif
+ if (!nowayout) {
+ inb_p(WDT_DC); /* Disable counters */
+ wdt_ctr_load(2,0); /* 0 length reset pulses now */
+ }
clear_bit(0, &wdt_is_open);
}
return 0;
diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/wdt977.c linux-2.4.20-pre1-nowayout/drivers/char/wdt977.c
--- linux-2.4.20-pre1-settimeout/drivers/char/wdt977.c Fri Sep 7 09:28:38 2001
+++ linux-2.4.20-pre1-nowayout/drivers/char/wdt977.c Wed Aug 7 15:30:18 2002
@@ -1,5 +1,5 @@
/*
- * Wdt977 0.01: A Watchdog Device for Netwinder W83977AF chip
+ * Wdt977 0.02: A Watchdog Device for Netwinder W83977AF chip
*
* (c) Copyright 1998 Rebel.com (Woody Suwalski <woody@netwinder.org>)
*
@@ -11,6 +11,8 @@
* 2 of the License, or (at your option) any later version.
*
* -----------------------
+ * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
*/

#include <linux/module.h>
@@ -32,6 +34,16 @@
static int timer_alive;
static int testmode;

+#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)");
+
+
/*
* Allow only one person to hold it open
*/
@@ -40,9 +52,9 @@
{
if(timer_alive)
return -EBUSY;
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
- MOD_INC_USE_COUNT;
-#endif
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
timer_alive++;

//max timeout value = 255 minutes (0xFF). Write 0 to disable WatchDog.
@@ -89,9 +101,9 @@
{
/*
* Shut off the timer.
- * Lock it in if it's a module and we defined ...NOWAYOUT
+ * Lock it in if it's a module and we set nowayout
*/
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) { /* FIXME: not fixing indentation */
lock_kernel();

// unlock the SuperIO chip
@@ -127,7 +139,7 @@
unlock_kernel();

printk(KERN_INFO "Watchdog: shutdown.\n");
-#endif
+ }
return 0;
}

diff -uNr linux-2.4.20-pre1-settimeout/drivers/char/wdt_pci.c linux-2.4.20-pre1-nowayout/drivers/char/wdt_pci.c
--- linux-2.4.20-pre1-settimeout/drivers/char/wdt_pci.c Fri Aug 2 17:39:43 2002
+++ linux-2.4.20-pre1-nowayout/drivers/char/wdt_pci.c Wed Aug 7 15:30:18 2002
@@ -32,6 +32,7 @@
* Tigran Aivazian : Restructured wdtpci_init_one() to handle failures
* Joel Becker : Added WDIOC_GET/SETTIMEOUT
* Zwane Mwaikambo : Magic char closing, locking changes, cleanups
+ * Matt Domsch : nowayout module option
*/

#include <linux/config.h>
@@ -87,6 +88,15 @@

static int wd_margin = WD_TIMO;

+#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)");
+
/*
* Programming support
*/
@@ -231,16 +241,16 @@
return -ESPIPE;

if (count) {
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- size_t i;
+ if (!nowayout) {
+ size_t i;

- expect_close = 0;
+ expect_close = 0;

- for (i = 0; i != count; i++) {
- if (buf[i] == 'V')
- expect_close = 1;
+ for (i = 0; i != count; i++) {
+ if (buf[i] == 'V')
+ expect_close = 1;
+ }
}
-#endif
wdtpci_ping();
}

@@ -355,12 +365,12 @@
switch(MINOR(inode->i_rdev))
{
case WATCHDOG_MINOR:
- if (down_trylock(&open_sem))
- return -EBUSY;
+ if (down_trylock(&open_sem))
+ return -EBUSY;

-#ifdef CONFIG_WATCHDOG_NOWAYOUT
- MOD_INC_USE_COUNT;
-#endif
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
/*
* Activate
*/
@@ -415,7 +425,6 @@
{

if (MINOR(inode->i_rdev)==WATCHDOG_MINOR) {
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
unsigned long flags;
if (expect_close) {
spin_lock_irqsave(&wdtpci_lock, flags);
@@ -426,7 +435,6 @@
printk(KERN_CRIT PFX "Unexpected close, not stopping timer!");
wdtpci_ping();
}
-#endif
up(&open_sem);
}
return 0;
--

"Sometimes one pays most for the things one gets for nothing."
- Albert Einstein

Joel Becker
Senior Member of Technical Staff
Oracle Corporation
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127
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