[WATCHDOG 23/57] ks8695_wdt: clean up, coding style, 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, 62 insertions, 57 deletions

diff --git a/drivers/watchdog/ks8695_wdt.c b/drivers/watchdog/ks8695_wdt.c
index df5a6b811ccd..6d052b80aa20 100644
--- a/drivers/watchdog/ks8695_wdt.c
+++ b/drivers/watchdog/ks8695_wdt.c
@@ -19,8 +19,8 @@
 #include <linux/platform_device.h>
 #include <linux/types.h>
 #include <linux/watchdog.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
 #include <asm/arch/regs-timer.h>
 
 
@@ -31,38 +31,44 @@ static int wdt_time = WDT_DEFAULT_TIME;
 static int nowayout = WATCHDOG_NOWAYOUT;
 
 module_param(wdt_time, int, 0);
-MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="__MODULE_STRING(WDT_DEFAULT_TIME) ")");
+MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
+                                        __MODULE_STRING(WDT_DEFAULT_TIME) ")");
 
 #ifdef CONFIG_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) ")");
 #endif
 
 
 static unsigned long ks8695wdt_busy;
+static spinlock_t ks8695_lock;
 
 /* ......................................................................... */
 
 /*
  * Disable the watchdog.
  */
-static void inline ks8695_wdt_stop(void)
+static inline void ks8695_wdt_stop(void)
 {
         unsigned long tmcon;
 
+        spin_lock(&ks8695_lock);
         /* disable timer0 */
         tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
         __raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
+        spin_unlock(&ks8695_lock);
 }
 
 /*
  * Enable and reset the watchdog.
  */
-static void inline ks8695_wdt_start(void)
+static inline void ks8695_wdt_start(void)
 {
         unsigned long tmcon;
         unsigned long tval = wdt_time * CLOCK_TICK_RATE;
 
+        spin_lock(&ks8695_lock);
         /* disable timer0 */
         tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
         __raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
@@ -73,19 +79,22 @@ static void inline ks8695_wdt_start(void)
         /* re-enable timer0 */
         tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
         __raw_writel(tmcon | TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
+        spin_unlock(&ks8695_lock);
 }
 
 /*
  * Reload the watchdog timer.  (ie, pat the watchdog)
  */
-static void inline ks8695_wdt_reload(void)
+static inline void ks8695_wdt_reload(void)
 {
         unsigned long tmcon;
 
+        spin_lock(&ks8695_lock);
         /* disable, then re-enable timer0 */
         tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON);
         __raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
         __raw_writel(tmcon | TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON);
+        spin_unlock(&ks8695_lock);
 }
 
 /*
@@ -102,7 +111,8 @@ static int ks8695_wdt_settimeout(int new_time)
         if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
                 return -EINVAL;
 
-        /* Set new watchdog time. It will be used when ks8695_wdt_start() is called. */
+        /* Set new watchdog time. It will be used when
+           ks8695_wdt_start() is called. */
         wdt_time = new_time;
         return 0;
 }
@@ -128,9 +138,9 @@ static int ks8695_wdt_open(struct inode *inode, struct file *file)
  */
 static int ks8695_wdt_close(struct inode *inode, struct file *file)
 {
+        /* Disable the watchdog when file is closed */
         if (!nowayout)
-                ks8695_wdt_stop();      /* Disable the watchdog when file is closed */
-
+                ks8695_wdt_stop();
         clear_bit(0, &ks8695wdt_busy);
         return 0;
 }
@@ -143,60 +153,52 @@ static struct watchdog_info ks8695_wdt_info = {
 /*
  * Handle commands from user-space.
  */
-static int ks8695_wdt_ioctl(struct inode *inode, struct file *file,
-                unsigned int cmd, unsigned long arg)
+static long ks8695_wdt_ioctl(struct file *file, unsigned int cmd,
+                                                        unsigned long arg)
 {
         void __user *argp = (void __user *)arg;
         int __user *p = argp;
         int new_value;
 
-        switch(cmd) {
-                case WDIOC_KEEPALIVE:
-                        ks8695_wdt_reload();    /* pat the watchdog */
-                        return 0;
-
-                case WDIOC_GETSUPPORT:
-                        return copy_to_user(argp, &ks8695_wdt_info, sizeof(ks8695_wdt_info)) ? -EFAULT : 0;
-
-                case WDIOC_SETTIMEOUT:
-                        if (get_user(new_value, p))
-                                return -EFAULT;
-
-                        if (ks8695_wdt_settimeout(new_value))
-                                return -EINVAL;
-
-                        /* Enable new time value */
+        switch (cmd) {
+        case WDIOC_KEEPALIVE:
+                ks8695_wdt_reload();    /* pat the watchdog */
+                return 0;
+        case WDIOC_GETSUPPORT:
+                return copy_to_user(argp, &ks8695_wdt_info,
+                                        sizeof(ks8695_wdt_info)) ? -EFAULT : 0;
+        case WDIOC_SETTIMEOUT:
+                if (get_user(new_value, p))
+                        return -EFAULT;
+                if (ks8695_wdt_settimeout(new_value))
+                        return -EINVAL;
+                /* Enable new time value */
+                ks8695_wdt_start();
+                /* Return current value */
+                return put_user(wdt_time, p);
+        case WDIOC_GETTIMEOUT:
+                return put_user(wdt_time, p);
+        case WDIOC_GETSTATUS:
+        case WDIOC_GETBOOTSTATUS:
+                return put_user(0, p);
+        case WDIOC_SETOPTIONS:
+                if (get_user(new_value, p))
+                        return -EFAULT;
+                if (new_value & WDIOS_DISABLECARD)
+                        ks8695_wdt_stop();
+                if (new_value & WDIOS_ENABLECARD)
                         ks8695_wdt_start();
-
-                        /* Return current value */
-                        return put_user(wdt_time, p);
-
-                case WDIOC_GETTIMEOUT:
-                        return put_user(wdt_time, p);
-
-                case WDIOC_GETSTATUS:
-                case WDIOC_GETBOOTSTATUS:
-                        return put_user(0, p);
-
-                case WDIOC_SETOPTIONS:
-                        if (get_user(new_value, p))
-                                return -EFAULT;
-
-                        if (new_value & WDIOS_DISABLECARD)
-                                ks8695_wdt_stop();
-                        if (new_value & WDIOS_ENABLECARD)
-                                ks8695_wdt_start();
-                        return 0;
-
-                default:
-                        return -ENOTTY;
+                return 0;
+        default:
+                return -ENOTTY;
         }
 }
 
 /*
  * Pat the watchdog whenever device is written to.
  */
-static ssize_t ks8695_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
+static ssize_t ks8695_wdt_write(struct file *file, const char *data,
+                                                size_t len, loff_t *ppos)
 {
         ks8695_wdt_reload();            /* pat the watchdog */
         return len;
@@ -207,7 +209,7 @@ static ssize_t ks8695_wdt_write(struct file *file, const char *data, size_t len,
 static const struct file_operations ks8695wdt_fops = {
         .owner          = THIS_MODULE,
         .llseek         = no_llseek,
-        .ioctl          = ks8695_wdt_ioctl,
+        .unlocked_ioctl = ks8695_wdt_ioctl,
         .open           = ks8695_wdt_open,
         .release        = ks8695_wdt_close,
         .write          = ks8695_wdt_write,
@@ -231,7 +233,8 @@ static int __init ks8695wdt_probe(struct platform_device *pdev)
         if (res)
                 return res;
 
-        printk("KS8695 Watchdog Timer enabled (%d seconds%s)\n", wdt_time, nowayout ? ", nowayout" : "");
+        printk(KERN_INFO "KS8695 Watchdog Timer enabled (%d seconds%s)\n",
+                                wdt_time, nowayout ? ", nowayout" : "");
         return 0;
 }
 
@@ -285,12 +288,14 @@ static struct platform_driver ks8695wdt_driver = {
 
 static int __init ks8695_wdt_init(void)
 {
-        /* Check that the heartbeat value is within range; if not reset to the default */
+        spin_lock_init(&ks8695_lock);
+        /* Check that the heartbeat value is within range;
+           if not reset to the default */
         if (ks8695_wdt_settimeout(wdt_time)) {
                 ks8695_wdt_settimeout(WDT_DEFAULT_TIME);
-                pr_info("ks8695_wdt: wdt_time value must be 1 <= wdt_time <= %i, using %d\n", wdt_time, WDT_MAX_TIME);
+                pr_info("ks8695_wdt: wdt_time value must be 1 <= wdt_time <= %i, using %d\n",
+                                                        wdt_time, WDT_MAX_TIME);
         }
-
         return platform_driver_register(&ks8695wdt_driver);
 }