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[WATCHDOG 15/57] indydog: Clean up and tidy 

Switch to unlocked_ioctl as well

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Alan Cox 2008-05-19 14:06:08 +01:00 committed by Wim Van Sebroeck
parent 02355c329a
commit 9b9dbcca3f
1 changed files with 62 additions and 52 deletions
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114
drivers/watchdog/indydog.c
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@ -1,7 +1,8 @@
/* /*
* IndyDog 0.3 A Hardware Watchdog Device for SGI IP22 * 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 * This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License * modify it under the terms of the GNU General Public License
@ -22,32 +23,42 @@
#include <linux/notifier.h> #include <linux/notifier.h>
#include <linux/reboot.h> #include <linux/reboot.h>
#include <linux/init.h> #include <linux/init.h>
#include <asm/uaccess.h> #include <linux/uaccess.h>
#include <asm/sgi/mc.h> #include <asm/sgi/mc.h>
#define PFX "indydog: " #define PFX "indydog: "
static int indydog_alive; static unsigned long indydog_alive;
static spinlock_t indydog_lock;
#define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */ #define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */
static int nowayout = WATCHDOG_NOWAYOUT; static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0); module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
static void indydog_start(void) static void indydog_start(void)
{ {
u32 mc_ctrl0 = sgimc->cpuctrl0; u32 mc_ctrl0;
spin_lock(&indydog_lock);
mc_ctrl0 = sgimc->cpuctrl0;
mc_ctrl0 = sgimc->cpuctrl0 | SGIMC_CCTRL0_WDOG; mc_ctrl0 = sgimc->cpuctrl0 | SGIMC_CCTRL0_WDOG;
sgimc->cpuctrl0 = mc_ctrl0; sgimc->cpuctrl0 = mc_ctrl0;
spin_unlock(&indydog_lock);
} }
static void indydog_stop(void) static void indydog_stop(void)
{ {
u32 mc_ctrl0 = sgimc->cpuctrl0; u32 mc_ctrl0;
spin_lock(&indydog_lock);
mc_ctrl0 = sgimc->cpuctrl0;
mc_ctrl0 &= ~SGIMC_CCTRL0_WDOG; mc_ctrl0 &= ~SGIMC_CCTRL0_WDOG;
sgimc->cpuctrl0 = mc_ctrl0; sgimc->cpuctrl0 = mc_ctrl0;
spin_unlock(&indydog_lock);
printk(KERN_INFO PFX "Stopped watchdog timer.\n"); printk(KERN_INFO PFX "Stopped watchdog timer.\n");
} }
@ -62,7 +73,7 @@ static void indydog_ping(void)
*/ */
static int indydog_open(struct inode *inode, struct file *file) static int indydog_open(struct inode *inode, struct file *file)
{ {
if (indydog_alive) if (test_and_set_bit(0, &indydog_alive))
return -EBUSY; return -EBUSY;
if (nowayout) if (nowayout)
@ -84,23 +95,21 @@ static int indydog_release(struct inode *inode, struct file *file)
* Lock it in if it's a module and we defined ...NOWAYOUT */ * Lock it in if it's a module and we defined ...NOWAYOUT */
if (!nowayout) if (!nowayout)
indydog_stop(); /* Turn the WDT off */ indydog_stop(); /* Turn the WDT off */
clear_bit(0, &indydog_alive);
indydog_alive = 0;
return 0; 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. */ /* Refresh the timer. */
if (len) { if (len)
indydog_ping(); indydog_ping();
}
return len; return len;
} }
static int indydog_ioctl(struct inode *inode, struct file *file, static long indydog_ioctl(struct file *file, unsigned int cmd,
unsigned int cmd, unsigned long arg) unsigned long arg)
{ {
int options, retval = -EINVAL; int options, retval = -EINVAL;
static struct watchdog_info ident = { static struct watchdog_info ident = {
@ -111,42 +120,40 @@ static int indydog_ioctl(struct inode *inode, struct file *file,
}; };
switch (cmd) { switch (cmd) {
default: case WDIOC_GETSUPPORT:
return -ENOTTY; if (copy_to_user((struct watchdog_info *)arg,
case WDIOC_GETSUPPORT: &ident, sizeof(ident)))
if (copy_to_user((struct watchdog_info *)arg, return -EFAULT;
&ident, sizeof(ident))) return 0;
return -EFAULT; case WDIOC_GETSTATUS:
return 0; case WDIOC_GETBOOTSTATUS:
case WDIOC_GETSTATUS: return put_user(0, (int *)arg);
case WDIOC_GETBOOTSTATUS: case WDIOC_KEEPALIVE:
return put_user(0,(int *)arg); indydog_ping();
case WDIOC_KEEPALIVE: return 0;
indydog_ping(); case WDIOC_GETTIMEOUT:
return 0; return put_user(WATCHDOG_TIMEOUT, (int *)arg);
case WDIOC_GETTIMEOUT: case WDIOC_SETOPTIONS:
return put_user(WATCHDOG_TIMEOUT,(int *)arg); {
case WDIOC_SETOPTIONS: if (get_user(options, (int *)arg))
{ return -EFAULT;
if (get_user(options, (int *)arg)) if (options & WDIOS_DISABLECARD) {
return -EFAULT; indydog_stop();
retval = 0;
if (options & WDIOS_DISABLECARD) {
indydog_stop();
retval = 0;
}
if (options & WDIOS_ENABLECARD) {
indydog_start();
retval = 0;
}
return retval;
} }
if (options & WDIOS_ENABLECARD) {
indydog_start();
retval = 0;
}
return retval;
}
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) if (code == SYS_DOWN || code == SYS_HALT)
indydog_stop(); /* Turn the WDT off */ indydog_stop(); /* Turn the WDT off */
@ -158,7 +165,7 @@ static const struct file_operations indydog_fops = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.llseek = no_llseek, .llseek = no_llseek,
.write = indydog_write, .write = indydog_write,
.ioctl = indydog_ioctl, .unlocked_ioctl = indydog_ioctl,
.open = indydog_open, .open = indydog_open,
.release = indydog_release, .release = indydog_release,
}; };
@ -180,17 +187,20 @@ static int __init watchdog_init(void)
{ {
int ret; int ret;
spin_lock_init(&indydog_lock);
ret = register_reboot_notifier(&indydog_notifier); ret = register_reboot_notifier(&indydog_notifier);
if (ret) { if (ret) {
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", printk(KERN_ERR PFX
ret); "cannot register reboot notifier (err=%d)\n", ret);
return ret; return ret;
} }
ret = misc_register(&indydog_miscdev); ret = misc_register(&indydog_miscdev);
if (ret) { if (ret) {
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", printk(KERN_ERR PFX
WATCHDOG_MINOR, ret); "cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
unregister_reboot_notifier(&indydog_notifier); unregister_reboot_notifier(&indydog_notifier);
return ret; return ret;
} }