[PATCH 51/57] w83877f_wdt: clean up code, coding style, switch to unlocked_ioctl

Alan Cox
2008-05-19T13:35:11Z

drivers/watchdog/w83877f_wdt.c | 199 ++++++++++++++++++++--------------------
1 files changed, 101 insertions(+), 98 deletions(-)

diff --git a/drivers/watchdog/w83877f_wdt.c b/drivers/watchdog/w83877f_wdt.c
index f510a3a..75b546d 100644
--- a/drivers/watchdog/w83877f_wdt.c
+++ b/drivers/watchdog/w83877f_wdt.c
@@ -23,13 +23,16 @@
* Added KERN_* tags to printks
* add CONFIG_WATCHDOG_NOWAYOUT support
* fix possible wdt_is_open race
- * changed watchdog_info to correctly reflect what the driver offers
- * added WDIOC_GETSTATUS, WDIOC_GETBOOTSTATUS, WDIOC_SETTIMEOUT,
+ * changed watchdog_info to correctly reflect what
+ * the driver offers
+ * added WDIOC_GETSTATUS, WDIOC_GETBOOTSTATUS,
+ * WDIOC_SETTIMEOUT,
* WDIOC_GETTIMEOUT, and WDIOC_SETOPTIONS ioctls
* 09/8 - 2003 [wim@iguana.be] cleanup of trailing spaces
* added extra printk's for startup problems
* use module_param
- * made timeout (the emulated heartbeat) a module_param
+ * made timeout (the emulated heartbeat) a
+ * module_param
* made the keepalive ping an internal subroutine
*
* This WDT driver is different from most other Linux WDT
@@ -51,8 +54,8 @@
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
#include <asm/system.h>

#define OUR_NAME "w83877f_wdt"
@@ -80,14 +83,19 @@
*/

#define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */
-static int timeout = WATCHDOG_TIMEOUT; /* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
+/* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
+static int timeout = WATCHDOG_TIMEOUT;
module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+MODULE_PARM_DESC(timeout,
+ "Watchdog timeout in seconds. (1<=timeout<=3600, default="
+ __MODULE_STRING(WATCHDOG_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) ")");
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

static void wdt_timer_ping(unsigned long);
static DEFINE_TIMER(timer, wdt_timer_ping, 0, 0);
@@ -105,8 +113,7 @@ static void wdt_timer_ping(unsigned long data)
/* If we got a heartbeat pulse within the WDT_US_INTERVAL
* we agree to ping the WDT
*/
- if(time_before(jiffies, next_heartbeat))
- {
+ if (time_before(jiffies, next_heartbeat)) {
/* Ping the WDT */
spin_lock(&wdt_spinlock);

@@ -118,9 +125,9 @@ static void wdt_timer_ping(unsigned long data)

spin_unlock(&wdt_spinlock);

- } else {
- printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
- }
+ } else
+ printk(KERN_WARNING PFX
+ "Heartbeat lost! Will not ping the watchdog\n");
}

/*
@@ -181,22 +188,21 @@ static void wdt_keepalive(void)
* /dev/watchdog handling
*/

-static ssize_t fop_write(struct file * file, const char __user * buf, size_t count, loff_t * ppos)
+static ssize_t fop_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 (!nowayout)
- {
+ if (count) {
+ if (!nowayout) {
size_t ofs;

- /* note: just in case someone wrote the magic character
- * five months ago... */
+ /* note: just in case someone wrote the magic
+ character five months ago... */
wdt_expect_close = 0;

- /* scan to see whether or not we got the magic character */
- for(ofs = 0; ofs != count; ofs++)
- {
+ /* scan to see whether or not we got the
+ magic character */
+ for (ofs = 0; ofs != count; ofs++) {
char c;
if (get_user(c, buf + ofs))
return -EFAULT;
@@ -211,10 +217,10 @@ static ssize_t fop_write(struct file * file, const char __user * buf, size_t cou
return count;
}

-static int fop_open(struct inode * inode, struct file * file)
+static int fop_open(struct inode *inode, struct file *file)
{
/* Just in case we're already talking to someone... */
- if(test_and_set_bit(0, &wdt_is_open))
+ if (test_and_set_bit(0, &wdt_is_open))
return -EBUSY;

/* Good, fire up the show */
@@ -222,78 +228,78 @@ static int fop_open(struct inode * inode, struct file * file)
return nonseekable_open(inode, file);
}

-static int fop_close(struct inode * inode, struct file * file)
+static int fop_close(struct inode *inode, struct file *file)
{
- if(wdt_expect_close == 42)
+ if (wdt_expect_close == 42)
wdt_turnoff();
else {
del_timer(&timer);
- printk(KERN_CRIT PFX "device file closed unexpectedly. Will not stop the WDT!\n");
+ printk(KERN_CRIT PFX
+ "device file closed unexpectedly. Will not stop the WDT!\n");
}
clear_bit(0, &wdt_is_open);
wdt_expect_close = 0;
return 0;
}

-static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
+static long fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
- static struct watchdog_info ident=
- {
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+ static const struct watchdog_info ident = {
+ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
+ | WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "W83877F",
};

- switch(cmd)
+ switch (cmd) {
+ default:
+ return -ENOTTY;
+ case WDIOC_GETSUPPORT:
+ return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
+ case WDIOC_GETSTATUS:
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(0, p);
+ case WDIOC_KEEPALIVE:
+ wdt_keepalive();
+ return 0;
+ case WDIOC_SETOPTIONS:
{
- default:
- return -ENOTTY;
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
- case WDIOC_KEEPALIVE:
- wdt_keepalive();
- return 0;
- case WDIOC_SETOPTIONS:
- {
- int new_options, retval = -EINVAL;
-
- if(get_user(new_options, p))
- return -EFAULT;
-
- if(new_options & WDIOS_DISABLECARD) {
- wdt_turnoff();
- retval = 0;
- }
+ int new_options, retval = -EINVAL;

- if(new_options & WDIOS_ENABLECARD) {
- wdt_startup();
- retval = 0;
- }
+ if (get_user(new_options, p))
+ return -EFAULT;

- return retval;
+ if (new_options & WDIOS_DISABLECARD) {
+ wdt_turnoff();
+ retval = 0;
}
- case WDIOC_SETTIMEOUT:
- {
- int new_timeout;

- if(get_user(new_timeout, p))
- return -EFAULT;
+ if (new_options & WDIOS_ENABLECARD) {
+ wdt_startup();
+ retval = 0;
+ }

- if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */
- return -EINVAL;
+ return retval;
+ }
+ case WDIOC_SETTIMEOUT:
+ {
+ int new_timeout;

- timeout = new_timeout;
- wdt_keepalive();
- /* Fall through */
- }
- case WDIOC_GETTIMEOUT:
- return put_user(timeout, p);
+ if (get_user(new_timeout, p))
+ return -EFAULT;
+
+ /* arbitrary upper limit */
+ if (new_timeout < 1 || new_timeout > 3600)
+ return -EINVAL;
+
+ timeout = new_timeout;
+ wdt_keepalive();
+ /* Fall through */
+ }
+ case WDIOC_GETTIMEOUT:
+ return put_user(timeout, p);
}
}

@@ -303,7 +309,7 @@ static const struct file_operations wdt_fops = {
.write = fop_write,
.open = fop_open,
.release = fop_close,
- .ioctl = fop_ioctl,
+ .unlocked_ioctl = fop_ioctl,
};

static struct miscdevice wdt_miscdev = {
@@ -319,7 +325,7 @@ static struct miscdevice wdt_miscdev = {
static int wdt_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)
wdt_turnoff();
return NOTIFY_DONE;
}
@@ -329,8 +335,7 @@ static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
* turn the timebomb registers off.
*/

-static struct notifier_block wdt_notifier=
-{
+static struct notifier_block wdt_notifier = {
.notifier_call = wdt_notify_sys,
};

@@ -342,31 +347,29 @@ static void __exit w83877f_wdt_unload(void)
misc_deregister(&wdt_miscdev);

unregister_reboot_notifier(&wdt_notifier);
- release_region(WDT_PING,1);
- release_region(ENABLE_W83877F_PORT,2);
+ release_region(WDT_PING, 1);
+ release_region(ENABLE_W83877F_PORT, 2);
}

static int __init w83877f_wdt_init(void)
{
int rc = -EBUSY;

- if(timeout < 1 || timeout > 3600) /* arbitrary upper limit */
- {
+ if (timeout < 1 || timeout > 3600) { /* arbitrary upper limit */
timeout = WATCHDOG_TIMEOUT;
- printk(KERN_INFO PFX "timeout value must be 1<=x<=3600, using %d\n",
- timeout);
+ printk(KERN_INFO PFX
+ "timeout value must be 1 <= x <= 3600, using %d\n",
+ timeout);
}

- if (!request_region(ENABLE_W83877F_PORT, 2, "W83877F WDT"))
- {
+ if (!request_region(ENABLE_W83877F_PORT, 2, "W83877F WDT")) {
printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
ENABLE_W83877F_PORT);
rc = -EIO;
goto err_out;
}

- if (!request_region(WDT_PING, 1, "W8387FF WDT"))
- {
+ if (!request_region(WDT_PING, 1, "W8387FF WDT")) {
printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
WDT_PING);
rc = -EIO;
@@ -374,22 +377,22 @@ static int __init w83877f_wdt_init(void)
}

rc = register_reboot_notifier(&wdt_notifier);
- if (rc)
- {
- printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
- rc);
+ if (rc) {
+ printk(KERN_ERR PFX
+ "cannot register reboot notifier (err=%d)\n", rc);
goto err_out_region2;
}

rc = misc_register(&wdt_miscdev);
- if (rc)
- {
- printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- wdt_miscdev.minor, rc);
+ if (rc) {
+ printk(KERN_ERR PFX
+ "cannot register miscdev on minor=%d (err=%d)\n",
+ wdt_miscdev.minor, rc);
goto err_out_reboot;
}

- printk(KERN_INFO PFX "WDT driver for W83877F initialised. timeout=%d sec (nowayout=%d)\n",
+ printk(KERN_INFO PFX
+ "WDT driver for W83877F initialised. timeout=%d sec (nowayout=%d)\n",
timeout, nowayout);

return 0;
@@ -397,9 +400,9 @@ static int __init w83877f_wdt_init(void)
err_out_reboot:
unregister_reboot_notifier(&wdt_notifier);
err_out_region2:
- release_region(WDT_PING,1);
+ release_region(WDT_PING, 1);
err_out_region1:
- release_region(ENABLE_W83877F_PORT,2);
+ release_region(ENABLE_W83877F_PORT, 2);
err_out:
return rc;
}