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Diffstat (limited to 'drivers/watchdog/indydog.c')
-rw-r--r--drivers/watchdog/indydog.c138
1 files changed, 65 insertions, 73 deletions
diff --git a/drivers/watchdog/indydog.c b/drivers/watchdog/indydog.c
index 788245bdaa7..5d20cdd30ef 100644
--- a/drivers/watchdog/indydog.c
+++ b/drivers/watchdog/indydog.c
@@ -1,16 +1,19 @@
/*
* IndyDog 0.3 A Hardware Watchdog Device for SGI IP22
*
- * (c) Copyright 2002 Guido Guenther <agx@sigxcpu.org>, All Rights Reserved.
+ * (c) Copyright 2002 Guido Guenther <agx@sigxcpu.org>,
+ * All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
- * based on softdog.c by Alan Cox <alan@redhat.com>
+ * based on softdog.c by Alan Cox <alan@lxorguk.ukuu.org.uk>
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
@@ -22,34 +25,34 @@
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <asm/sgi/mc.h>
-#define PFX "indydog: "
-static int indydog_alive;
+static unsigned long indydog_alive;
+static DEFINE_SPINLOCK(indydog_lock);
#define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */
-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) ")");
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
static void indydog_start(void)
{
- u32 mc_ctrl0 = sgimc->cpuctrl0;
-
- mc_ctrl0 = sgimc->cpuctrl0 | SGIMC_CCTRL0_WDOG;
- sgimc->cpuctrl0 = mc_ctrl0;
+ spin_lock(&indydog_lock);
+ sgimc->cpuctrl0 |= SGIMC_CCTRL0_WDOG;
+ spin_unlock(&indydog_lock);
}
static void indydog_stop(void)
{
- u32 mc_ctrl0 = sgimc->cpuctrl0;
-
- mc_ctrl0 &= ~SGIMC_CCTRL0_WDOG;
- sgimc->cpuctrl0 = mc_ctrl0;
+ spin_lock(&indydog_lock);
+ sgimc->cpuctrl0 &= ~SGIMC_CCTRL0_WDOG;
+ spin_unlock(&indydog_lock);
- printk(KERN_INFO PFX "Stopped watchdog timer.\n");
+ pr_info("Stopped watchdog timer\n");
}
static void indydog_ping(void)
@@ -62,7 +65,7 @@ static void indydog_ping(void)
*/
static int indydog_open(struct inode *inode, struct file *file)
{
- if (indydog_alive)
+ if (test_and_set_bit(0, &indydog_alive))
return -EBUSY;
if (nowayout)
@@ -72,8 +75,7 @@ static int indydog_open(struct inode *inode, struct file *file)
indydog_start();
indydog_ping();
- indydog_alive = 1;
- printk(KERN_INFO "Started watchdog timer.\n");
+ pr_info("Started watchdog timer\n");
return nonseekable_open(inode, file);
}
@@ -84,69 +86,64 @@ static int indydog_release(struct inode *inode, struct file *file)
* Lock it in if it's a module and we defined ...NOWAYOUT */
if (!nowayout)
indydog_stop(); /* Turn the WDT off */
-
- indydog_alive = 0;
-
+ clear_bit(0, &indydog_alive);
return 0;
}
-static ssize_t indydog_write(struct file *file, const char *data, size_t len, loff_t *ppos)
+static ssize_t indydog_write(struct file *file, const char *data,
+ size_t len, loff_t *ppos)
{
/* Refresh the timer. */
- if (len) {
+ if (len)
indydog_ping();
- }
return len;
}
-static int indydog_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long indydog_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
{
int options, retval = -EINVAL;
- static struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING |
- WDIOF_MAGICCLOSE,
+ static const struct watchdog_info ident = {
+ .options = WDIOF_KEEPALIVEPING,
.firmware_version = 0,
.identity = "Hardware Watchdog for SGI IP22",
};
switch (cmd) {
- default:
- return -ENOTTY;
- case WDIOC_GETSUPPORT:
- if (copy_to_user((struct watchdog_info *)arg,
- &ident, sizeof(ident)))
- return -EFAULT;
- return 0;
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0,(int *)arg);
- case WDIOC_KEEPALIVE:
- indydog_ping();
- return 0;
- case WDIOC_GETTIMEOUT:
- return put_user(WATCHDOG_TIMEOUT,(int *)arg);
- case WDIOC_SETOPTIONS:
- {
- if (get_user(options, (int *)arg))
- return -EFAULT;
-
- if (options & WDIOS_DISABLECARD) {
- indydog_stop();
- retval = 0;
- }
-
- if (options & WDIOS_ENABLECARD) {
- indydog_start();
- retval = 0;
- }
-
- return retval;
+ case WDIOC_GETSUPPORT:
+ if (copy_to_user((struct watchdog_info *)arg,
+ &ident, sizeof(ident)))
+ return -EFAULT;
+ return 0;
+ case WDIOC_GETSTATUS:
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(0, (int *)arg);
+ case WDIOC_SETOPTIONS:
+ {
+ if (get_user(options, (int *)arg))
+ return -EFAULT;
+ if (options & WDIOS_DISABLECARD) {
+ indydog_stop();
+ retval = 0;
+ }
+ if (options & WDIOS_ENABLECARD) {
+ indydog_start();
+ retval = 0;
}
+ return retval;
+ }
+ case WDIOC_KEEPALIVE:
+ indydog_ping();
+ return 0;
+ case WDIOC_GETTIMEOUT:
+ return put_user(WATCHDOG_TIMEOUT, (int *)arg);
+ default:
+ return -ENOTTY;
}
}
-static int indydog_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
+static int indydog_notify_sys(struct notifier_block *this,
+ unsigned long code, void *unused)
{
if (code == SYS_DOWN || code == SYS_HALT)
indydog_stop(); /* Turn the WDT off */
@@ -158,7 +155,7 @@ static const struct file_operations indydog_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = indydog_write,
- .ioctl = indydog_ioctl,
+ .unlocked_ioctl = indydog_ioctl,
.open = indydog_open,
.release = indydog_release,
};
@@ -173,29 +170,25 @@ static struct notifier_block indydog_notifier = {
.notifier_call = indydog_notify_sys,
};
-static char banner[] __initdata =
- KERN_INFO PFX "Hardware Watchdog Timer for SGI IP22: 0.3\n";
-
static int __init watchdog_init(void)
{
int ret;
ret = register_reboot_notifier(&indydog_notifier);
if (ret) {
- printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
- ret);
+ pr_err("cannot register reboot notifier (err=%d)\n", ret);
return ret;
}
ret = misc_register(&indydog_miscdev);
if (ret) {
- printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
+ pr_err("cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, ret);
unregister_reboot_notifier(&indydog_notifier);
return ret;
}
- printk(banner);
+ pr_info("Hardware Watchdog Timer for SGI IP22: 0.3\n");
return 0;
}
@@ -212,4 +205,3 @@ module_exit(watchdog_exit);
MODULE_AUTHOR("Guido Guenther <agx@sigxcpu.org>");
MODULE_DESCRIPTION("Hardware Watchdog Device for SGI IP22");
MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 13:35:38 +0000