openwrt/target/linux/omap24xx/patches-2.6.38/540-cbus-retu-wdt-remove-static-variables.patch

--- a/drivers/cbus/retu-wdt.c
+++ b/drivers/cbus/retu-wdt.c
@@ -7,6 +7,8 @@
  *
  * Written by Amit Kucheria <amit.kucheria@nokia.com>
  *
+ * Cleanups by Michael Buesch <mb@bu3sch.de> (C) 2011
+ *
  * This file is subject to the terms and conditions of the GNU General
  * Public License. See the file "COPYING" in the main directory of this
  * archive for more details.
@@ -48,37 +50,31 @@
 #define RETU_WDT_DEFAULT_TIMER 32
 #define RETU_WDT_MAX_TIMER 63
 
-static DEFINE_MUTEX(retu_wdt_mutex);
-
-/* Current period of watchdog */
-static unsigned int period_val = RETU_WDT_DEFAULT_TIMER;
-
 struct retu_wdt_dev {
 	struct device		*dev;
+	unsigned int		period_val;	/* Current period of watchdog */
 	unsigned long		users;
-	struct miscdevice	retu_wdt_miscdev;
+	struct miscdevice	miscdev;
 	struct delayed_work	ping_work;
+	struct mutex		mutex;
 };
 
-static struct retu_wdt_dev *retu_wdt;
 
-static int _retu_modify_counter(unsigned int new)
+static inline void _retu_modify_counter(struct retu_wdt_dev *wdev,
+					unsigned int new)
 {
-	if (retu_wdt)
-		retu_write_reg(retu_wdt->dev, RETU_REG_WATCHDOG, (u16)new);
-
-	return 0;
+	retu_write_reg(wdev->dev, RETU_REG_WATCHDOG, (u16)new);
 }
 
-static int retu_modify_counter(unsigned int new)
+static int retu_modify_counter(struct retu_wdt_dev *wdev, unsigned int new)
 {
 	if (new < RETU_WDT_MIN_TIMER || new > RETU_WDT_MAX_TIMER)
 		return -EINVAL;
 
-	mutex_lock(&retu_wdt_mutex);
-	period_val = new;
-	_retu_modify_counter(period_val);
-	mutex_unlock(&retu_wdt_mutex);
+	mutex_lock(&wdev->mutex);
+	wdev->period_val = new;
+	_retu_modify_counter(wdev, wdev->period_val);
+	mutex_unlock(&wdev->mutex);
 
 	return 0;
 }
@@ -90,14 +86,14 @@ static int retu_modify_counter(unsigned
  */
 static void retu_wdt_ping_enable(struct retu_wdt_dev *wdev)
 {
-	_retu_modify_counter(RETU_WDT_MAX_TIMER);
+	_retu_modify_counter(wdev, RETU_WDT_MAX_TIMER);
 	schedule_delayed_work(&wdev->ping_work,
 			      round_jiffies_relative(RETU_WDT_DEFAULT_TIMER * HZ));
 }
 
 static void retu_wdt_ping_disable(struct retu_wdt_dev *wdev)
 {
-	_retu_modify_counter(RETU_WDT_MAX_TIMER);
+	_retu_modify_counter(wdev, RETU_WDT_MAX_TIMER);
 	cancel_delayed_work_sync(&wdev->ping_work);
 }
 
@@ -110,18 +106,21 @@ static void retu_wdt_ping_work(struct wo
 
 static int retu_wdt_open(struct inode *inode, struct file *file)
 {
-	if (test_and_set_bit(0, &retu_wdt->users))
+	struct miscdevice *mdev = file->private_data;
+	struct retu_wdt_dev *wdev = container_of(mdev, struct retu_wdt_dev, miscdev);
+
+	if (test_and_set_bit(0, &wdev->users))
 		return -EBUSY;
 
-	file->private_data = (void *)retu_wdt;
-	retu_wdt_ping_disable(retu_wdt);
+	retu_wdt_ping_disable(wdev);
 
 	return nonseekable_open(inode, file);
 }
 
 static int retu_wdt_release(struct inode *inode, struct file *file)
 {
-	struct retu_wdt_dev *wdev = file->private_data;
+	struct miscdevice *mdev = file->private_data;
+	struct retu_wdt_dev *wdev = container_of(mdev, struct retu_wdt_dev, miscdev);
 
 #ifndef CONFIG_WATCHDOG_NOWAYOUT
 	retu_wdt_ping_enable(wdev);
@@ -134,8 +133,11 @@ static int retu_wdt_release(struct inode
 static ssize_t retu_wdt_write(struct file *file, const char __user *data,
 						size_t len, loff_t *ppos)
 {
+	struct miscdevice *mdev = file->private_data;
+	struct retu_wdt_dev *wdev = container_of(mdev, struct retu_wdt_dev, miscdev);
+
 	if (len)
-		retu_modify_counter(RETU_WDT_MAX_TIMER);
+		retu_modify_counter(wdev, RETU_WDT_MAX_TIMER);
 
 	return len;
 }
@@ -143,6 +145,8 @@ static ssize_t retu_wdt_write(struct fil
 static long retu_wdt_ioctl(struct file *file, unsigned int cmd,
 			   unsigned long arg)
 {
+	struct miscdevice *mdev = file->private_data;
+	struct retu_wdt_dev *wdev = container_of(mdev, struct retu_wdt_dev, miscdev);
 	int new_margin;
 
 	static struct watchdog_info ident = {
@@ -167,15 +171,15 @@ static long retu_wdt_ioctl(struct file *
 			return put_user(omap_prcm_get_reset_sources(),
 					(int __user *)arg);
 	case WDIOC_KEEPALIVE:
-		retu_modify_counter(RETU_WDT_MAX_TIMER);
+		retu_modify_counter(wdev, RETU_WDT_MAX_TIMER);
 		break;
 	case WDIOC_SETTIMEOUT:
 		if (get_user(new_margin, (int __user *)arg))
 			return -EFAULT;
-		retu_modify_counter(new_margin);
+		retu_modify_counter(wdev, new_margin);
 		/* Fall through */
 	case WDIOC_GETTIMEOUT:
-		return put_user(period_val, (int __user *)arg);
+		return put_user(wdev->period_val, (int __user *)arg);
 	}
 
 	return 0;
@@ -199,15 +203,17 @@ static int __init retu_wdt_probe(struct
 		return -ENOMEM;
 
 	wdev->dev = &pdev->dev;
+	wdev->period_val = RETU_WDT_DEFAULT_TIMER;
+	mutex_init(&wdev->mutex);
 
 	platform_set_drvdata(pdev, wdev);
-	retu_wdt = wdev;
-	wdev->retu_wdt_miscdev.parent = &pdev->dev;
-	wdev->retu_wdt_miscdev.minor = WATCHDOG_MINOR;
-	wdev->retu_wdt_miscdev.name = "watchdog";
-	wdev->retu_wdt_miscdev.fops = &retu_wdt_fops;
 
-	ret = misc_register(&(wdev->retu_wdt_miscdev));
+	wdev->miscdev.parent = &pdev->dev;
+	wdev->miscdev.minor = WATCHDOG_MINOR;
+	wdev->miscdev.name = "watchdog";
+	wdev->miscdev.fops = &retu_wdt_fops;
+
+	ret = misc_register(&wdev->miscdev);
 	if (ret)
 		goto err_free_wdev;
 
@@ -216,9 +222,9 @@ static int __init retu_wdt_probe(struct
 	/* Kick the watchdog for kernel booting to finish.
 	 * If nowayout is not set, we start the ping work. */
 #ifdef CONFIG_WATCHDOG_NOWAYOUT
-	retu_modify_counter(RETU_WDT_MAX_TIMER);
+	retu_modify_counter(wdev, RETU_WDT_MAX_TIMER);
 #else
-	retu_wdt_ping_enable(retu_wdt);
+	retu_wdt_ping_enable(wdev);
 #endif
 
 	return 0;
@@ -234,7 +240,7 @@ static int __devexit retu_wdt_remove(str
 	struct retu_wdt_dev *wdev;
 
 	wdev = platform_get_drvdata(pdev);
-	misc_deregister(&wdev->retu_wdt_miscdev);
+	misc_deregister(&wdev->miscdev);
 	cancel_delayed_work_sync(&wdev->ping_work);
 	kfree(wdev);