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Commit 94da1e2e authored by Alan Cox's avatar Alan Cox Committed by Wim Van Sebroeck
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[WATCHDOG 01/57] Clean acquirewdt and check for BKL dependancies 

This brings the file into line with coding style.
Signed-off-by: default avatarAlan Cox <alan@redhat.com>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent e490517a
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Showing with 58 additions and 61 deletions
drivers/watchdog/acquirewdt.c
View file @ 94da1e2e
......@@ -58,39 +58,46 @@
#include <linux/types.h> /* For standard types (like size_t) */
#include <linux/errno.h> /* For the -ENODEV/... values */
#include <linux/kernel.h> /* For printk/panic/... */
#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
(WATCHDOG_MINOR) */
#include <linux/watchdog.h> /* For the watchdog specific items */
#include <linux/fs.h> /* For file operations */
#include <linux/ioport.h> /* For io-port access */
#include <linux/platform_device.h> /* For platform_driver framework */
#include <linux/init.h> /* For __init/__exit/... */
#include <asm/uaccess.h> /* For copy_to_user/put_user/... */
#include <asm/io.h> /* For inb/outb/... */
#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
#include <linux/io.h> /* For inb/outb/... */
/* Module information */
#define DRV_NAME "acquirewdt"
#define PFX DRV_NAME ": "
#define WATCHDOG_NAME "Acquire WDT"
#define WATCHDOG_HEARTBEAT 0 /* There is no way to see what the correct time-out period is */
/* There is no way to see what the correct time-out period is */
#define WATCHDOG_HEARTBEAT 0
/* internal variables */
static struct platform_device *acq_platform_device; /* the watchdog platform device */
/* the watchdog platform device */
static struct platform_device *acq_platform_device;
static unsigned long acq_is_open;
static char expect_close;
/* module parameters */
static int wdt_stop = 0x43; /* You must set this - there is no sane way to probe for this board. */
/* You must set this - there is no sane way to probe for this board. */
static int wdt_stop = 0x43;
module_param(wdt_stop, int, 0);
MODULE_PARM_DESC(wdt_stop, "Acquire WDT 'stop' io port (default 0x43)");
static int wdt_start = 0x443; /* You must set this - there is no sane way to probe for this board. */
/* You must set this - there is no sane way to probe for this board. */
static int wdt_start = 0x443;
module_param(wdt_start, int, 0);
MODULE_PARM_DESC(wdt_start, "Acquire WDT 'start' io port (default 0x443)");
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) ")");
MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
/*
* Watchdog Operations
......@@ -112,18 +119,18 @@ static void acq_stop(void)
* /dev/watchdog handling
*/
static ssize_t acq_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
static ssize_t acq_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
/* See if we got the magic character 'V' and reload the timer */
if(count) {
if (count) {
if (!nowayout) {
size_t i;
/* note: just in case someone wrote the magic character
* five months ago... */
expect_close = 0;
/* scan to see whether or not we got the magic character */
/* scan to see whether or not we got the
magic character */
for (i = 0; i != count; i++) {
char c;
if (get_user(c, buf + i))
......@@ -132,64 +139,55 @@ static ssize_t acq_write(struct file *file, const char __user *buf, size_t count
expect_close = 42;
}
}
/* Well, anyhow someone wrote to us, we should return that favour */
/* Well, anyhow someone wrote to us, we should
return that favour */
acq_keepalive();
}
return count;
}
static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
static long acq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int options, retval = -EINVAL;
void __user *argp = (void __user *)arg;
int __user *p = argp;
static struct watchdog_info ident =
{
static struct watchdog_info ident = {
.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = WATCHDOG_NAME,
};
switch(cmd)
{
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
return put_user(0, p);
case WDIOC_KEEPALIVE:
acq_keepalive();
return 0;
acq_keepalive();
return 0;
case WDIOC_GETTIMEOUT:
return put_user(WATCHDOG_HEARTBEAT, p);
case WDIOC_SETOPTIONS:
{
if (get_user(options, p))
return -EFAULT;
if (options & WDIOS_DISABLECARD)
{
acq_stop();
retval = 0;
}
if (options & WDIOS_ENABLECARD)
{
acq_keepalive();
retval = 0;
}
return retval;
if (get_user(options, p))
return -EFAULT;
if (options & WDIOS_DISABLECARD) {
acq_stop();
retval = 0;
}
if (options & WDIOS_ENABLECARD) {
acq_keepalive();
retval = 0;
}
return retval;
}
default:
return -ENOTTY;
return -ENOTTY;
}
}
......@@ -211,7 +209,8 @@ static int acq_close(struct inode *inode, struct file *file)
if (expect_close == 42) {
acq_stop();
} else {
printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
printk(KERN_CRIT PFX
"Unexpected close, not stopping watchdog!\n");
acq_keepalive();
}
clear_bit(0, &acq_is_open);
......@@ -227,7 +226,7 @@ static const struct file_operations acq_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = acq_write,
.ioctl = acq_ioctl,
.unlocked_ioctl = acq_ioctl,
.open = acq_open,
.release = acq_close,
};
......@@ -248,32 +247,29 @@ static int __devinit acq_probe(struct platform_device *dev)
if (wdt_stop != wdt_start) {
if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) {
printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
wdt_stop);
printk(KERN_ERR PFX
"I/O address 0x%04x already in use\n", wdt_stop);
ret = -EIO;
goto out;
}
}
if (!request_region(wdt_start, 1, WATCHDOG_NAME)) {
printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
wdt_start);
ret = -EIO;
goto unreg_stop;
}
ret = misc_register(&acq_miscdev);
if (ret != 0) {
printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
printk(KERN_ERR PFX
"cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
goto unreg_regions;
}
printk (KERN_INFO PFX "initialized. (nowayout=%d)\n",
nowayout);
printk(KERN_INFO PFX "initialized. (nowayout=%d)\n", nowayout);
return 0;
unreg_regions:
release_region(wdt_start, 1);
unreg_stop:
......@@ -286,9 +282,9 @@ out:
static int __devexit acq_remove(struct platform_device *dev)
{
misc_deregister(&acq_miscdev);
release_region(wdt_start,1);
if(wdt_stop != wdt_start)
release_region(wdt_stop,1);
release_region(wdt_start, 1);
if (wdt_stop != wdt_start)
release_region(wdt_stop, 1);
return 0;
}
......@@ -313,18 +309,19 @@ static int __init acq_init(void)
{
int err;
printk(KERN_INFO "WDT driver for Acquire single board computer initialising.\n");
printk(KERN_INFO
"WDT driver for Acquire single board computer initialising.\n");
err = platform_driver_register(&acquirewdt_driver);
if (err)
return err;
acq_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
acq_platform_device = platform_device_register_simple(DRV_NAME,
-1, NULL, 0);
if (IS_ERR(acq_platform_device)) {
err = PTR_ERR(acq_platform_device);
goto unreg_platform_driver;
}
return 0;
unreg_platform_driver:
......
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