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Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog

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* git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog:
  [WATCHDOG] constify function pointer tables
  [WATCHDOG] TXx9 watchdog driver
  [WATCHDOG] misc_register patch	
  [WATCHDOG] wdt: fix locking
This commit is contained in:
Linus Torvalds 2008-01-29 09:00:01 +11:00
commit 8561b089af
16 changed files with 385 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/watchdog/Kconfig
View File

@ -639,6 +639,12 @@ config AR7_WDT
help
Hardware driver for the TI AR7 Watchdog Timer.
config TXX9_WDT
tristate "Toshiba TXx9 Watchdog Timer"
depends on CPU_TX39XX || CPU_TX49XX
help
Hardware driver for the built-in watchdog timer on TXx9 MIPS SoCs.
# PARISC Architecture
# POWERPC Architecture

1
drivers/watchdog/Makefile
View File

@ -93,6 +93,7 @@ obj-$(CONFIG_INDYDOG) += indydog.o
obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o
obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
# PARISC Architecture

22
drivers/watchdog/alim1535_wdt.c
View File

@ -413,18 +413,18 @@ static int __init watchdog_init(void)
/* Calculate the watchdog's timeout */
ali_settimer(timeout);
ret = misc_register(&ali_miscdev);
if (ret != 0) {
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
goto out;
}
ret = register_reboot_notifier(&ali_notifier);
if (ret != 0) {
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
ret);
goto unreg_miscdev;
goto out;
}
ret = misc_register(&ali_miscdev);
if (ret != 0) {
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
goto unreg_reboot;
}
printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
@ -432,8 +432,8 @@ static int __init watchdog_init(void)
out:
return ret;
unreg_miscdev:
misc_deregister(&ali_miscdev);
unreg_reboot:
unregister_reboot_notifier(&ali_notifier);
goto out;
}
@ -449,8 +449,8 @@ static void __exit watchdog_exit(void)
ali_stop();
/* Deregister */
unregister_reboot_notifier(&ali_notifier);
misc_deregister(&ali_miscdev);
unregister_reboot_notifier(&ali_notifier);
pci_dev_put(ali_pci);
}

20
drivers/watchdog/alim7101_wdt.c
View File

@ -377,18 +377,18 @@ static int __init alim7101_wdt_init(void)
timeout);
}
rc = misc_register(&wdt_miscdev);
if (rc) {
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
wdt_miscdev.minor, rc);
goto err_out;
}
rc = register_reboot_notifier(&wdt_notifier);
if (rc) {
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
rc);
goto err_out_miscdev;
goto err_out;
}
rc = misc_register(&wdt_miscdev);
if (rc) {
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
wdt_miscdev.minor, rc);
goto err_out_reboot;
}
if (nowayout) {
@ -399,8 +399,8 @@ static int __init alim7101_wdt_init(void)
timeout, nowayout);
return 0;
err_out_miscdev:
misc_deregister(&wdt_miscdev);
err_out_reboot:
unregister_reboot_notifier(&wdt_notifier);
err_out:
pci_dev_put(alim7101_pmu);
return rc;

2
drivers/watchdog/ar7_wdt.c
View File

@ -279,7 +279,7 @@ static int ar7_wdt_ioctl(struct inode *inode, struct file *file,
}
}
static struct file_operations ar7_wdt_fops = {
static const struct file_operations ar7_wdt_fops = {
.owner = THIS_MODULE,
.write = ar7_wdt_write,
.ioctl = ar7_wdt_ioctl,

2
drivers/watchdog/bfin_wdt.c
View File

@ -390,7 +390,7 @@ static struct platform_driver bfin_wdt_driver = {
.resume = bfin_wdt_resume,
};
static struct file_operations bfin_wdt_fops = {
static const struct file_operations bfin_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = bfin_wdt_write,

2
drivers/watchdog/it8712f_wdt.c
View File

@ -296,7 +296,7 @@ it8712f_wdt_release(struct inode *inode, struct file *file)
return 0;
}
static struct file_operations it8712f_wdt_fops = {
static const struct file_operations it8712f_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = it8712f_wdt_write,

2
drivers/watchdog/mpc5200_wdt.c
View File

@ -158,7 +158,7 @@ static int mpc5200_wdt_release(struct inode *inode, struct file *file)
return 0;
}
static struct file_operations mpc5200_wdt_fops = {
static const struct file_operations mpc5200_wdt_fops = {
.owner = THIS_MODULE,
.write = mpc5200_wdt_write,
.ioctl = mpc5200_wdt_ioctl,

2
drivers/watchdog/mtx-1_wdt.c
View File

@ -180,7 +180,7 @@ static ssize_t mtx1_wdt_write(struct file *file, const char *buf, size_t count,
return count;
}
static struct file_operations mtx1_wdt_fops = {
static const struct file_operations mtx1_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.ioctl = mtx1_wdt_ioctl,

22
drivers/watchdog/sbc60xxwdt.c
View File

@ -359,20 +359,20 @@ static int __init sbc60xxwdt_init(void)
}
}
rc = misc_register(&wdt_miscdev);
if (rc)
{
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
wdt_miscdev.minor, rc);
goto err_out_region2;
}
rc = register_reboot_notifier(&wdt_notifier);
if (rc)
{
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
rc);
goto err_out_miscdev;
goto err_out_region2;
}
rc = misc_register(&wdt_miscdev);
if (rc)
{
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
wdt_miscdev.minor, rc);
goto err_out_reboot;
}
printk(KERN_INFO PFX "WDT driver for 60XX single board computer initialised. timeout=%d sec (nowayout=%d)\n",
@ -380,8 +380,8 @@ static int __init sbc60xxwdt_init(void)
return 0;
err_out_miscdev:
misc_deregister(&wdt_miscdev);
err_out_reboot:
unregister_reboot_notifier(&wdt_notifier);
err_out_region2:
if ((wdt_stop != 0x45) && (wdt_stop != wdt_start))
release_region(wdt_stop,1);

10
drivers/watchdog/scx200_wdt.c
View File

@ -231,17 +231,17 @@ static int __init scx200_wdt_init(void)
sema_init(&open_semaphore, 1);
r = misc_register(&scx200_wdt_miscdev);
r = register_reboot_notifier(&scx200_wdt_notifier);
if (r) {
printk(KERN_ERR NAME ": unable to register reboot notifier");
release_region(scx200_cb_base + SCx200_WDT_OFFSET,
SCx200_WDT_SIZE);
return r;
}
r = register_reboot_notifier(&scx200_wdt_notifier);
r = misc_register(&scx200_wdt_miscdev);
if (r) {
printk(KERN_ERR NAME ": unable to register reboot notifier");
misc_deregister(&scx200_wdt_miscdev);
unregister_reboot_notifier(&scx200_wdt_notifier);
release_region(scx200_cb_base + SCx200_WDT_OFFSET,
SCx200_WDT_SIZE);
return r;
@ -252,8 +252,8 @@ static int __init scx200_wdt_init(void)
static void __exit scx200_wdt_cleanup(void)
{
unregister_reboot_notifier(&scx200_wdt_notifier);
misc_deregister(&scx200_wdt_miscdev);
unregister_reboot_notifier(&scx200_wdt_notifier);
release_region(scx200_cb_base + SCx200_WDT_OFFSET,
SCx200_WDT_SIZE);
}

276
drivers/watchdog/txx9wdt.c Normal file
View File

@ -0,0 +1,276 @@
/*
* txx9wdt: A Hardware Watchdog Driver for TXx9 SoCs
*
* Copyright (C) 2007 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/fs.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <asm/txx9tmr.h>
#define TIMER_MARGIN 60 /* Default is 60 seconds */
static int timeout = TIMER_MARGIN; /* in seconds */
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout,
"Watchdog timeout in seconds. "
"(0<timeout<((2^" __MODULE_STRING(TXX9_TIMER_BITS) ")/(IMCLK/256)), "
"default=" __MODULE_STRING(TIMER_MARGIN) ")");
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started "
"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
#define WD_TIMER_CCD 7 /* 1/256 */
#define WD_TIMER_CLK (clk_get_rate(txx9_imclk) / (2 << WD_TIMER_CCD))
#define WD_MAX_TIMEOUT ((0xffffffff >> (32 - TXX9_TIMER_BITS)) / WD_TIMER_CLK)
static unsigned long txx9wdt_alive;
static int expect_close;
static struct txx9_tmr_reg __iomem *txx9wdt_reg;
static struct clk *txx9_imclk;
static void txx9wdt_ping(void)
{
__raw_writel(TXx9_TMWTMR_TWIE | TXx9_TMWTMR_TWC, &txx9wdt_reg->wtmr);
}
static void txx9wdt_start(void)
{
__raw_writel(WD_TIMER_CLK * timeout, &txx9wdt_reg->cpra);
__raw_writel(WD_TIMER_CCD, &txx9wdt_reg->ccdr);
__raw_writel(0, &txx9wdt_reg->tisr); /* clear pending interrupt */
__raw_writel(TXx9_TMTCR_TCE | TXx9_TMTCR_CCDE | TXx9_TMTCR_TMODE_WDOG,
&txx9wdt_reg->tcr);
__raw_writel(TXx9_TMWTMR_TWIE | TXx9_TMWTMR_TWC, &txx9wdt_reg->wtmr);
}
static void txx9wdt_stop(void)
{
__raw_writel(TXx9_TMWTMR_WDIS, &txx9wdt_reg->wtmr);
__raw_writel(__raw_readl(&txx9wdt_reg->tcr) & ~TXx9_TMTCR_TCE,
&txx9wdt_reg->tcr);
}
static int txx9wdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &txx9wdt_alive))
return -EBUSY;
if (__raw_readl(&txx9wdt_reg->tcr) & TXx9_TMTCR_TCE) {
clear_bit(0, &txx9wdt_alive);
return -EBUSY;
}
if (nowayout)
__module_get(THIS_MODULE);
txx9wdt_start();
return nonseekable_open(inode, file);
}
static int txx9wdt_release(struct inode *inode, struct file *file)
{
if (expect_close)
txx9wdt_stop();
else {
printk(KERN_CRIT "txx9wdt: "
"Unexpected close, not stopping watchdog!\n");
txx9wdt_ping();
}
clear_bit(0, &txx9wdt_alive);
expect_close = 0;
return 0;
}
static ssize_t txx9wdt_write(struct file *file, const char __user *data,
size_t len, loff_t *ppos)
{
if (len) {
if (!nowayout) {
size_t i;
expect_close = 0;
for (i = 0; i != len; i++) {
char c;
if (get_user(c, data + i))
return -EFAULT;
if (c == 'V')
expect_close = 1;
}
}
txx9wdt_ping();
}
return len;
}
static int txx9wdt_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_timeout;
static struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE,
.firmware_version = 0,
.identity = "Hardware Watchdog for TXx9",
};
switch (cmd) {
default:
return -ENOTTY;
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_KEEPALIVE:
txx9wdt_ping();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_timeout, p))
return -EFAULT;
if (new_timeout < 1 || new_timeout > WD_MAX_TIMEOUT)
return -EINVAL;
timeout = new_timeout;
txx9wdt_stop();
txx9wdt_start();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(timeout, p);
}
}
static int txx9wdt_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
if (code == SYS_DOWN || code == SYS_HALT)
txx9wdt_stop();
return NOTIFY_DONE;
}
static const struct file_operations txx9wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = txx9wdt_write,
.ioctl = txx9wdt_ioctl,
.open = txx9wdt_open,
.release = txx9wdt_release,
};
static struct miscdevice txx9wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &txx9wdt_fops,
};
static struct notifier_block txx9wdt_notifier = {
.notifier_call = txx9wdt_notify_sys
};
static int __init txx9wdt_probe(struct platform_device *dev)
{
struct resource *res;
int ret;
txx9_imclk = clk_get(NULL, "imbus_clk");
if (IS_ERR(txx9_imclk)) {
ret = PTR_ERR(txx9_imclk);
txx9_imclk = NULL;
goto exit;
}
ret = clk_enable(txx9_imclk);
if (ret) {
clk_put(txx9_imclk);
txx9_imclk = NULL;
goto exit;
}
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!res)
goto exit_busy;
if (!devm_request_mem_region(&dev->dev,
res->start, res->end - res->start + 1,
"txx9wdt"))
goto exit_busy;
txx9wdt_reg = devm_ioremap(&dev->dev,
res->start, res->end - res->start + 1);
if (!txx9wdt_reg)
goto exit_busy;
ret = register_reboot_notifier(&txx9wdt_notifier);
if (ret)
goto exit;
ret = misc_register(&txx9wdt_miscdev);
if (ret) {
unregister_reboot_notifier(&txx9wdt_notifier);
goto exit;
}
printk(KERN_INFO "Hardware Watchdog Timer for TXx9: "
"timeout=%d sec (max %ld) (nowayout= %d)\n",
timeout, WD_MAX_TIMEOUT, nowayout);
return 0;
exit_busy:
ret = -EBUSY;
exit:
if (txx9_imclk) {
clk_disable(txx9_imclk);
clk_put(txx9_imclk);
}
return ret;
}
static int __exit txx9wdt_remove(struct platform_device *dev)
{
misc_deregister(&txx9wdt_miscdev);
unregister_reboot_notifier(&txx9wdt_notifier);
clk_disable(txx9_imclk);
clk_put(txx9_imclk);
return 0;
}
static struct platform_driver txx9wdt_driver = {
.remove = __exit_p(txx9wdt_remove),
.driver = {
.name = "txx9wdt",
.owner = THIS_MODULE,
},
};
static int __init watchdog_init(void)
{
return platform_driver_probe(&txx9wdt_driver, txx9wdt_probe);
}
static void __exit watchdog_exit(void)
{
platform_driver_unregister(&txx9wdt_driver);
}
module_init(watchdog_init);
module_exit(watchdog_exit);
MODULE_DESCRIPTION("TXx9 Watchdog Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

22
drivers/watchdog/w83877f_wdt.c
View File

@ -373,20 +373,20 @@ static int __init w83877f_wdt_init(void)
goto err_out_region1;
}
rc = misc_register(&wdt_miscdev);
if (rc)
{
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
wdt_miscdev.minor, rc);
goto err_out_region2;
}
rc = register_reboot_notifier(&wdt_notifier);
if (rc)
{
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
rc);
goto err_out_miscdev;
goto err_out_region2;
}
rc = misc_register(&wdt_miscdev);
if (rc)
{
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
wdt_miscdev.minor, rc);
goto err_out_reboot;
}
printk(KERN_INFO PFX "WDT driver for W83877F initialised. timeout=%d sec (nowayout=%d)\n",
@ -394,8 +394,8 @@ static int __init w83877f_wdt_init(void)
return 0;
err_out_miscdev:
misc_deregister(&wdt_miscdev);
err_out_reboot:
unregister_reboot_notifier(&wdt_notifier);
err_out_region2:
release_region(WDT_PING,1);
err_out_region1:

22
drivers/watchdog/w83977f_wdt.c
View File

@ -494,20 +494,20 @@ static int __init w83977f_wdt_init(void)
goto err_out;
}
rc = misc_register(&wdt_miscdev);
if (rc)
{
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
wdt_miscdev.minor, rc);
goto err_out_region;
}
rc = register_reboot_notifier(&wdt_notifier);
if (rc)
{
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
rc);
goto err_out_miscdev;
goto err_out_region;
}
rc = misc_register(&wdt_miscdev);
if (rc)
{
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
wdt_miscdev.minor, rc);
goto err_out_reboot;
}
printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d testmode=%d)\n",
@ -515,8 +515,8 @@ static int __init w83977f_wdt_init(void)
return 0;
err_out_miscdev:
misc_deregister(&wdt_miscdev);
err_out_reboot:
unregister_reboot_notifier(&wdt_notifier);
err_out_region:
release_region(IO_INDEX_PORT,2);
err_out:

30
drivers/watchdog/wdt.c
View File

@ -70,6 +70,8 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" _
static int io=0x240;
static int irq=11;
static DEFINE_SPINLOCK(wdt_lock);
module_param(io, int, 0);
MODULE_PARM_DESC(io, "WDT io port (default=0x240)");
module_param(irq, int, 0);
@ -109,6 +111,8 @@ static void wdt_ctr_load(int ctr, int val)
static int wdt_start(void)
{
unsigned long flags;
spin_lock_irqsave(&wdt_lock, flags);
inb_p(WDT_DC); /* Disable watchdog */
wdt_ctr_mode(0,3); /* Program CTR0 for Mode 3: Square Wave Generator */
wdt_ctr_mode(1,2); /* Program CTR1 for Mode 2: Rate Generator */
@ -117,6 +121,7 @@ static int wdt_start(void)
wdt_ctr_load(1,wd_heartbeat); /* Heartbeat */
wdt_ctr_load(2,65535); /* Length of reset pulse */
outb_p(0, WDT_DC); /* Enable watchdog */
spin_unlock_irqrestore(&wdt_lock, flags);
return 0;
}
@ -128,9 +133,12 @@ static int wdt_start(void)
static int wdt_stop (void)
{
unsigned long flags;
spin_lock_irqsave(&wdt_lock, flags);
/* Turn the card off */
inb_p(WDT_DC); /* Disable watchdog */
wdt_ctr_load(2,0); /* 0 length reset pulses now */
spin_unlock_irqrestore(&wdt_lock, flags);
return 0;
}
@ -143,11 +151,14 @@ static int wdt_stop (void)
static int wdt_ping(void)
{
unsigned long flags;
spin_lock_irqsave(&wdt_lock, flags);
/* Write a watchdog value */
inb_p(WDT_DC); /* Disable watchdog */
wdt_ctr_mode(1,2); /* Re-Program CTR1 for Mode 2: Rate Generator */
wdt_ctr_load(1,wd_heartbeat); /* Heartbeat */
outb_p(0, WDT_DC); /* Enable watchdog */
spin_unlock_irqrestore(&wdt_lock, flags);
return 0;
}
@ -182,7 +193,12 @@ static int wdt_set_heartbeat(int t)
static int wdt_get_status(int *status)
{
unsigned char new_status=inb_p(WDT_SR);
unsigned char new_status;
unsigned long flags;
spin_lock_irqsave(&wdt_lock, flags);
new_status = inb_p(WDT_SR);
spin_unlock_irqrestore(&wdt_lock, flags);
*status=0;
if (new_status & WDC_SR_ISOI0)
@ -214,8 +230,12 @@ static int wdt_get_status(int *status)
static int wdt_get_temperature(int *temperature)
{
unsigned short c=inb_p(WDT_RT);
unsigned short c;
unsigned long flags;
spin_lock_irqsave(&wdt_lock, flags);
c = inb_p(WDT_RT);
spin_unlock_irqrestore(&wdt_lock, flags);
*temperature = (c * 11 / 15) + 7;
return 0;
}
@ -237,7 +257,10 @@ static irqreturn_t wdt_interrupt(int irq, void *dev_id)
* Read the status register see what is up and
* then printk it.
*/
unsigned char status=inb_p(WDT_SR);
unsigned char status;
spin_lock(&wdt_lock);
status = inb_p(WDT_SR);
printk(KERN_CRIT "WDT status %d\n", status);
@ -265,6 +288,7 @@ static irqreturn_t wdt_interrupt(int irq, void *dev_id)
printk(KERN_CRIT "Reset in 5ms.\n");
#endif
}
spin_unlock(&wdt_lock);
return IRQ_HANDLED;
}

22
drivers/watchdog/wdt977.c
View File

@ -470,20 +470,20 @@ static int __init wd977_init(void)
}
}
rc = misc_register(&wdt977_miscdev);
if (rc)
{
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
wdt977_miscdev.minor, rc);
goto err_out_region;
}
rc = register_reboot_notifier(&wdt977_notifier);
if (rc)
{
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
rc);
goto err_out_miscdev;
goto err_out_region;
}
rc = misc_register(&wdt977_miscdev);
if (rc)
{
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
wdt977_miscdev.minor, rc);
goto err_out_reboot;
}
printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d, testmode=%i)\n",
@ -491,8 +491,8 @@ static int __init wd977_init(void)
return 0;
err_out_miscdev:
misc_deregister(&wdt977_miscdev);
err_out_reboot:
unregister_reboot_notifier(&wdt977_notifier);
err_out_region:
if (!machine_is_netwinder())
release_region(IO_INDEX_PORT,2);