iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

it8712f_wdt: Locking and coding style

Browse Source 
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox 2008-08-04 17:54:01 +01:00 committed by Linus Torvalds
parent 670d59c0ae
commit d6547378df
1 changed files with 27 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
drivers/watchdog/it8712f_wdt.c
View File

@ -30,9 +30,8 @@
#include <linux/fs.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#define NAME "it8712f_wdt"
@ -50,7 +49,7 @@ static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
static struct semaphore it8712f_wdt_sem;
static unsigned long wdt_open;
static unsigned expect_close;
static spinlock_t io_lock;
static unsigned char revision;
@ -86,22 +85,19 @@ static unsigned short address;
#define WDT_OUT_PWROK 0x10
#define WDT_OUT_KRST 0x40
static int
superio_inb(int reg)
static int superio_inb(int reg)
{
outb(reg, REG);
return inb(VAL);
}
static void
superio_outb(int val, int reg)
static void superio_outb(int val, int reg)
{
outb(reg, REG);
outb(val, VAL);
}
static int
superio_inw(int reg)
static int superio_inw(int reg)
{
int val;
outb(reg++, REG);
@ -111,15 +107,13 @@ superio_inw(int reg)
return val;
}
static inline void
superio_select(int ldn)
static inline void superio_select(int ldn)
{
outb(LDN, REG);
outb(ldn, VAL);
}
static inline void
superio_enter(void)
static inline void superio_enter(void)
{
spin_lock(&io_lock);
outb(0x87, REG);
@ -128,22 +122,19 @@ superio_enter(void)
outb(0x55, REG);
}
static inline void
superio_exit(void)
static inline void superio_exit(void)
{
outb(0x02, REG);
outb(0x02, VAL);
spin_unlock(&io_lock);
}
static inline void
it8712f_wdt_ping(void)
static inline void it8712f_wdt_ping(void)
{
inb(address);
}
static void
it8712f_wdt_update_margin(void)
static void it8712f_wdt_update_margin(void)
{
int config = WDT_OUT_KRST | WDT_OUT_PWROK;
int units = margin;
@ -165,8 +156,7 @@ it8712f_wdt_update_margin(void)
superio_outb(units, WDT_TIMEOUT);
}
static int
it8712f_wdt_get_status(void)
static int it8712f_wdt_get_status(void)
{
if (superio_inb(WDT_CONTROL) & 0x01)
return WDIOF_CARDRESET;
@ -174,8 +164,7 @@ it8712f_wdt_get_status(void)
return 0;
}
static void
it8712f_wdt_enable(void)
static void it8712f_wdt_enable(void)
{
printk(KERN_DEBUG NAME ": enabling watchdog timer\n");
superio_enter();
@ -190,8 +179,7 @@ it8712f_wdt_enable(void)
it8712f_wdt_ping();
}
static void
it8712f_wdt_disable(void)
static void it8712f_wdt_disable(void)
{
printk(KERN_DEBUG NAME ": disabling watchdog timer\n");
@ -207,8 +195,7 @@ it8712f_wdt_disable(void)
superio_exit();
}
static int
it8712f_wdt_notify(struct notifier_block *this,
static int it8712f_wdt_notify(struct notifier_block *this,
unsigned long code, void *unused)
{
if (code == SYS_HALT || code == SYS_POWER_OFF)
@ -222,8 +209,7 @@ static struct notifier_block it8712f_wdt_notifier = {
.notifier_call = it8712f_wdt_notify,
};
static ssize_t
it8712f_wdt_write(struct file *file, const char __user *data,
static ssize_t it8712f_wdt_write(struct file *file, const char __user *data,
size_t len, loff_t *ppos)
{
/* check for a magic close character */
@ -245,9 +231,8 @@ it8712f_wdt_write(struct file *file, const char __user *data,
return len;
}
static int
it8712f_wdt_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
static long it8712f_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
@ -302,19 +287,16 @@ it8712f_wdt_ioctl(struct inode *inode, struct file *file,
}
}
static int
it8712f_wdt_open(struct inode *inode, struct file *file)
static int it8712f_wdt_open(struct inode *inode, struct file *file)
{
/* only allow one at a time */
if (down_trylock(&it8712f_wdt_sem))
if (test_and_set_bit(0, &wdt_open))
return -EBUSY;
it8712f_wdt_enable();
return nonseekable_open(inode, file);
}
static int
it8712f_wdt_release(struct inode *inode, struct file *file)
static int it8712f_wdt_release(struct inode *inode, struct file *file)
{
if (expect_close != 42) {
printk(KERN_WARNING NAME
@ -324,7 +306,7 @@ it8712f_wdt_release(struct inode *inode, struct file *file)
it8712f_wdt_disable();
}
expect_close = 0;
up(&it8712f_wdt_sem);
clear_bit(0, &wdt_open);
return 0;
}
@ -333,7 +315,7 @@ static const struct file_operations it8712f_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = it8712f_wdt_write,
.ioctl = it8712f_wdt_ioctl,
.unlocked_ioctl = it8712f_wdt_ioctl,
.open = it8712f_wdt_open,
.release = it8712f_wdt_release,
};
@ -344,8 +326,7 @@ static struct miscdevice it8712f_wdt_miscdev = {
.fops = &it8712f_wdt_fops,
};
static int __init
it8712f_wdt_find(unsigned short *address)
static int __init it8712f_wdt_find(unsigned short *address)
{
int err = -ENODEV;
int chip_type;
@ -387,8 +368,7 @@ exit:
return err;
}
static int __init
it8712f_wdt_init(void)
static int __init it8712f_wdt_init(void)
{
int err = 0;
@ -404,8 +384,6 @@ it8712f_wdt_init(void)
it8712f_wdt_disable();
sema_init(&it8712f_wdt_sem, 1);
err = register_reboot_notifier(&it8712f_wdt_notifier);
if (err) {
printk(KERN_ERR NAME ": unable to register reboot notifier\n");
@ -430,8 +408,7 @@ out:
return err;
}
static void __exit
it8712f_wdt_exit(void)
static void __exit it8712f_wdt_exit(void)
{
misc_deregister(&it8712f_wdt_miscdev);
unregister_reboot_notifier(&it8712f_wdt_notifier);