[WATCHDOG 43/57] sc520_wdt: Clean up and switch to unlocked_ioctl

Review and switch to unlocked_ioctl

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 86 insertions, 75 deletions

diff --git a/drivers/watchdog/sc520_wdt.c b/drivers/watchdog/sc520_wdt.c
index 2847324a2be..525555a8779 100644
--- a/drivers/watchdog/sc520_wdt.c
+++ b/drivers/watchdog/sc520_wdt.c
@@ -64,9 +64,9 @@
 #include <linux/reboot.h>
 #include <linux/init.h>
 #include <linux/jiffies.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
 
-#include <asm/io.h>
-#include <asm/uaccess.h>
 #include <asm/system.h>
 
 #define OUR_NAME "sc520_wdt"
@@ -91,13 +91,18 @@
  */
 
 #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) ")");
 
 /*
  * AMD Elan SC520 - Watchdog Timer Registers
@@ -136,8 +141,7 @@ 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);
                 writew(0xAAAA, wdtmrctl);
@@ -146,9 +150,9 @@ static void wdt_timer_ping(unsigned long data)
 
                 /* Re-set the timer interval */
                 mod_timer(&timer, jiffies + WDT_INTERVAL);
-        } 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");
 }
 
 /*
@@ -162,7 +166,7 @@ static void wdt_config(int writeval)
 
         /* buy some time (ping) */
         spin_lock_irqsave(&wdt_spinlock, flags);
-        dummy=readw(wdtmrctl);  /* ensure write synchronization */
+        dummy = readw(wdtmrctl);        /* ensure write synchronization */
         writew(0xAAAA, wdtmrctl);
         writew(0x5555, wdtmrctl);
         /* unlock WDT = make WDT configuration register writable one time */
@@ -219,10 +223,11 @@ static int wdt_set_heartbeat(int t)
  *      /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 (count) {
                 if (!nowayout) {
                         size_t ofs;
 
@@ -231,25 +236,26 @@ static ssize_t fop_write(struct file * file, const char __user * buf, size_t cou
                         wdt_expect_close = 0;
 
                         /* now scan */
-                        for(ofs = 0; ofs != count; ofs++) {
+                        for (ofs = 0; ofs != count; ofs++) {
                                 char c;
                                 if (get_user(c, buf + ofs))
                                         return -EFAULT;
-                                if(c == 'V')
+                                if (c == 'V')
                                         wdt_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 */
                 wdt_keepalive();
         }
         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;
         if (nowayout)
                 __module_get(THIS_MODULE);
@@ -259,12 +265,13 @@ 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 {
-                printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+        else {
+                printk(KERN_CRIT PFX
+                        "Unexpected close, not stopping watchdog!\n");
                 wdt_keepalive();
         }
         clear_bit(0, &wdt_is_open);
@@ -272,63 +279,63 @@ static int fop_close(struct inode * inode, struct file * file)
         return 0;
 }
 
-static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
-        unsigned long arg)
+static int 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 = "SC520",
         };
 
-        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:
-                {
-                        int new_options, retval = -EINVAL;
-
-                        if(get_user(new_options, p))
-                                return -EFAULT;
-
-                        if(new_options & WDIOS_DISABLECARD) {
-                                wdt_turnoff();
-                                retval = 0;
-                        }
+        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(new_options & WDIOS_ENABLECARD) {
-                                wdt_startup();
-                                retval = 0;
-                        }
+                if (get_user(new_options, p))
+                        return -EFAULT;
+
+                if (new_options & WDIOS_DISABLECARD) {
+                        wdt_turnoff();
+                        retval = 0;
+                }
 
-                        return retval;
+                if (new_options & WDIOS_ENABLECARD) {
+                        wdt_startup();
+                        retval = 0;
                 }
-                case WDIOC_SETTIMEOUT:
-                {
-                        int new_timeout;
 
-                        if(get_user(new_timeout, p))
-                                return -EFAULT;
+                return retval;
+        }
+        case WDIOC_SETTIMEOUT:
+        {
+                int new_timeout;
 
-                        if(wdt_set_heartbeat(new_timeout))
-                                return -EINVAL;
+                if (get_user(new_timeout, p))
+                        return -EFAULT;
 
-                        wdt_keepalive();
-                        /* Fall through */
-                }
-                case WDIOC_GETTIMEOUT:
-                        return put_user(timeout, p);
+                if (wdt_set_heartbeat(new_timeout))
+                        return -EINVAL;
+
+                wdt_keepalive();
+                /* Fall through */
+        }
+        case WDIOC_GETTIMEOUT:
+                return put_user(timeout, p);
         }
 }
 
@@ -354,7 +361,7 @@ 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;
 }
@@ -383,11 +390,13 @@ static int __init sc520_wdt_init(void)
 {
         int rc = -EBUSY;
 
-        /* Check that the timeout value is within it's range ; if not reset to the default */
+        /* Check that the timeout value is within it's range ;
+           if not reset to the default */
         if (wdt_set_heartbeat(timeout)) {
                 wdt_set_heartbeat(WATCHDOG_TIMEOUT);
-                printk(KERN_INFO PFX "timeout value must be 1<=timeout<=3600, using %d\n",
-                        WATCHDOG_TIMEOUT);
+                printk(KERN_INFO PFX
+                    "timeout value must be 1 <= timeout <= 3600, using %d\n",
+                                                        WATCHDOG_TIMEOUT);
         }
 
         wdtmrctl = ioremap((unsigned long)(MMCR_BASE + OFFS_WDTMRCTL), 2);
@@ -399,20 +408,22 @@ static int __init sc520_wdt_init(void)
 
         rc = register_reboot_notifier(&wdt_notifier);
         if (rc) {
-                printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
-                        rc);
+                printk(KERN_ERR PFX
+                        "cannot register reboot notifier (err=%d)\n", rc);
                 goto err_out_ioremap;
         }
 
         rc = misc_register(&wdt_miscdev);
         if (rc) {
-                printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
-                        WATCHDOG_MINOR, rc);
+                printk(KERN_ERR PFX
+                        "cannot register miscdev on minor=%d (err=%d)\n",
+                                                        WATCHDOG_MINOR, rc);
                 goto err_out_notifier;
         }
 
-        printk(KERN_INFO PFX "WDT driver for SC520 initialised. timeout=%d sec (nowayout=%d)\n",
-                timeout,nowayout);
+        printk(KERN_INFO PFX
+           "WDT driver for SC520 initialised. timeout=%d sec (nowayout=%d)\n",
+                                                        timeout, nowayout);
 
         return 0;