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[WATCHDOG] MIPS RM9000 on-chip watchdog device - patch 4

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a number of small patches:
- include notifier.h include file
- re-arrange prototype functions
- remove =0 initializations
- change printk logging levels to what's used in other drivers
- /dev/watchdog is a VFS so use nonseekable_open
- Style: Instead of "if (constant op function_or_variable)"
  we prefer "if (function_or_variable op constant)"
- arg is a __user pointer
- use MAX_TIMEOUT_SECONDS instead of 32 in WDIOC_SETTIMEOUT

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Wim Van Sebroeck 2006-11-17 23:50:06 +01:00
parent 414a675964
commit d5d06ff7f1
1 changed files with 22 additions and 20 deletions
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42
drivers/char/watchdog/rm9k_wdt.c
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@ -26,6 +26,7 @@
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/reboot.h>
#include <linux/notifier.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <asm/io.h>
@ -47,13 +48,15 @@
/* Function prototypes */
static irqreturn_t wdt_gpi_irqhdl(int, void *, struct pt_regs *);
static void wdt_gpi_start(void);
static void wdt_gpi_stop(void);
static void wdt_gpi_set_timeout(unsigned int);
static int wdt_gpi_open(struct inode *, struct file *);
static int wdt_gpi_release(struct inode *, struct file *);
static ssize_t wdt_gpi_write(struct file *, const char __user *, size_t, loff_t *);
static long wdt_gpi_ioctl(struct file *, unsigned int, unsigned long);
static const struct resource *wdt_gpi_get_resource(struct platform_device *, const char *, unsigned int);
static int wdt_gpi_notify(struct notifier_block *, unsigned long, void *);
static const struct resource *wdt_gpi_get_resource(struct platform_device *, const char *, unsigned int);
static int __init wdt_gpi_probe(struct device *);
static int __exit wdt_gpi_remove(struct device *);
@ -61,7 +64,7 @@ static int __exit wdt_gpi_remove(struct device *);
static const char wdt_gpi_name[] = "wdt_gpi";
static atomic_t opencnt;
static int expect_close;
static int locked = 0;
static int locked;
/* These are set from device resources */
@ -82,7 +85,7 @@ static unsigned long flagaddr = 0xbffdc104;
module_param(flagaddr, ulong, 0444);
MODULE_PARM_DESC(flagaddr, "Address to write to boot flags to");
static int powercycle = 0;
static int powercycle;
module_param(powercycle, bool, 0444);
MODULE_PARM_DESC(powercycle, "Cycle power if watchdog expires");
@ -99,7 +102,7 @@ static irqreturn_t wdt_gpi_irqhdl(int irq, void *ctxt, struct pt_regs *regs)
__raw_writel(0x1, wd_regs + 0x0008);
printk(KERN_WARNING "%s: watchdog expired - resetting system\n",
printk(KERN_CRIT "%s: watchdog expired - resetting system\n",
wdt_gpi_name);
*(volatile char *) flagaddr |= 0x01;
@ -155,11 +158,11 @@ static void wdt_gpi_set_timeout(unsigned int to)
/* /dev/watchdog operations */
static int wdt_gpi_open(struct inode *i, struct file *f)
static int wdt_gpi_open(struct inode *inode, struct file *file)
{
int res;
if (unlikely(0 > atomic_dec_if_positive(&opencnt)))
if (unlikely(atomic_dec_if_positive(&opencnt) < 0))
return -EBUSY;
expect_close = 0;
@ -179,13 +182,13 @@ static int wdt_gpi_open(struct inode *i, struct file *f)
printk(KERN_INFO "%s: watchdog started, timeout = %u seconds\n",
wdt_gpi_name, timeout);
return 0;
return nonseekable_open(inode, file);
}
static int wdt_gpi_release(struct inode *i, struct file *f)
static int wdt_gpi_release(struct inode *inode, struct file *file)
{
if (nowayout) {
printk(KERN_NOTICE "%s: no way out - watchdog left running\n",
printk(KERN_INFO "%s: no way out - watchdog left running\n",
wdt_gpi_name);
__module_get(THIS_MODULE);
locked = 1;
@ -195,7 +198,7 @@ static int wdt_gpi_release(struct inode *i, struct file *f)
free_irq(wd_irq, &miscdev);
printk(KERN_INFO "%s: watchdog stopped\n", wdt_gpi_name);
} else {
printk(KERN_NOTICE "%s: unexpected close() -"
printk(KERN_CRIT "%s: unexpected close() -"
" watchdog left running\n",
wdt_gpi_name);
wdt_gpi_set_timeout(timeout);
@ -224,6 +227,7 @@ wdt_gpi_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
long res = -ENOTTY;
const long size = _IOC_SIZE(cmd);
int stat;
void __user *argp = (void __user *)arg;
static struct watchdog_info wdinfo = {
.identity = "RM9xxx/GPI watchdog",
.firmware_version = 0,
@ -248,8 +252,7 @@ wdt_gpi_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
wdinfo.options = nowayout ?
WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING :
WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE;
res = __copy_to_user((void __user *)arg, &wdinfo, size) ?
-EFAULT : size;
res = __copy_to_user(argp, &wdinfo, size) ? -EFAULT : size;
break;
case WDIOC_GETSTATUS:
@ -258,7 +261,7 @@ wdt_gpi_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
case WDIOC_GETBOOTSTATUS:
stat = (*(volatile char *) flagaddr & 0x01)
? WDIOF_CARDRESET : 0;
res = __copy_to_user((void __user *)arg, &stat, size) ?
res = __copy_to_user(argp, &stat, size) ?
-EFAULT : size;
break;
@ -273,24 +276,23 @@ wdt_gpi_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
case WDIOC_SETTIMEOUT:
{
int val;
if (unlikely(__copy_from_user(&val, (const void __user *) arg,
size))) {
if (unlikely(__copy_from_user(&val, argp, size))) {
res = -EFAULT;
break;
}
if (val > 32)
val = 32;
if (val > MAX_TIMEOUT_SECONDS)
val = MAX_TIMEOUT_SECONDS;
timeout = val;
wdt_gpi_set_timeout(val);
res = size;
printk("%s: timeout set to %u seconds\n",
printk(KERN_INFO "%s: timeout set to %u seconds\n",
wdt_gpi_name, timeout);
}
break;
case WDIOC_GETTIMEOUT:
res = __copy_to_user((void __user *) arg, &timeout, size) ?
res = __copy_to_user(argp, &timeout, size) ?
-EFAULT : size;
break;
}
@ -299,7 +301,7 @@ wdt_gpi_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
}
/* Shutdown notifier*/
/* Shutdown notifier */
static int
wdt_gpi_notify(struct notifier_block *this, unsigned long code, void *unused)
{