wdt: Cleanup and sort out locking and inb_p

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 171 insertions, 129 deletions

diff --git a/drivers/watchdog/wdt_pci.c b/drivers/watchdog/wdt_pci.c
index 1355608683e..078f37f8038 100644
--- a/drivers/watchdog/wdt_pci.c
+++ b/drivers/watchdog/wdt_pci.c
@@ -29,9 +29,11 @@
  *		JP Nollmann	:	Added support for PCI wdt501p
  *		Alan Cox	:	Split ISA and PCI cards into two drivers
  *		Jeff Garzik	:	PCI cleanups
- *		Tigran Aivazian	:	Restructured wdtpci_init_one() to handle failures
+ *		Tigran Aivazian	:	Restructured wdtpci_init_one() to handle
+ *					failures
  *		Joel Becker 	:	Added WDIOC_GET/SETTIMEOUT
- *		Zwane Mwaikambo	:	Magic char closing, locking changes, cleanups
+ *		Zwane Mwaikambo	:	Magic char closing, locking changes,
+ *					cleanups
  *		Matt Domsch	:	nowayout module option
  */
 
@@ -47,9 +49,9 @@
 #include <linux/init.h>
 #include <linux/fs.h>
 #include <linux/pci.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
 
-#include <asm/io.h>
-#include <asm/uaccess.h>
 #include <asm/system.h>
 
 #define WDT_IS_PCI
@@ -73,7 +75,7 @@
 /* We can only use 1 card due to the /dev/watchdog restriction */
 static int dev_count;
 
-static struct semaphore open_sem;
+static unsigned long open_lock;
 static DEFINE_SPINLOCK(wdtpci_lock);
 static char expect_close;
 
@@ -86,18 +88,23 @@ static int irq;
 static int heartbeat = WD_TIMO;
 static int wd_heartbeat;
 module_param(heartbeat, int, 0);
-MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")");
+MODULE_PARM_DESC(heartbeat,
+		"Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
+				__MODULE_STRING(WD_TIMO) ")");
 
 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) ")");
 
 #ifdef CONFIG_WDT_501_PCI
 /* Support for the Fan Tachometer on the PCI-WDT501 */
 static int tachometer;
 
 module_param(tachometer, int, 0);
-MODULE_PARM_DESC(tachometer, "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
+MODULE_PARM_DESC(tachometer,
+	"PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
 #endif /* CONFIG_WDT_501_PCI */
 
 /*
@@ -106,16 +113,19 @@ MODULE_PARM_DESC(tachometer, "PCI-WDT501 Fan Tachometer support (0=disable, defa
 
 static void wdtpci_ctr_mode(int ctr, int mode)
 {
-	ctr<<=6;
-	ctr|=0x30;
-	ctr|=(mode<<1);
-	outb_p(ctr, WDT_CR);
+	ctr <<= 6;
+	ctr |= 0x30;
+	ctr |= (mode << 1);
+	outb(ctr, WDT_CR);
+	udelay(8);
 }
 
 static void wdtpci_ctr_load(int ctr, int val)
 {
-	outb_p(val&0xFF, WDT_COUNT0+ctr);
-	outb_p(val>>8, WDT_COUNT0+ctr);
+	outb(val & 0xFF, WDT_COUNT0 + ctr);
+	udelay(8);
+	outb(val >> 8, WDT_COUNT0 + ctr);
+	udelay(8);
 }
 
 /**
@@ -134,23 +144,35 @@ static int wdtpci_start(void)
 	 * "pet" the watchdog, as Access says.
 	 * This resets the clock outputs.
 	 */
-	inb_p(WDT_DC);			/* Disable watchdog */
-	wdtpci_ctr_mode(2,0);		/* Program CTR2 for Mode 0: Pulse on Terminal Count */
-	outb_p(0, WDT_DC);		/* Enable watchdog */
-
-	inb_p(WDT_DC);			/* Disable watchdog */
-	outb_p(0, WDT_CLOCK);		/* 2.0833MHz clock */
-	inb_p(WDT_BUZZER);		/* disable */
-	inb_p(WDT_OPTONOTRST);		/* disable */
-	inb_p(WDT_OPTORST);		/* disable */
-	inb_p(WDT_PROGOUT);		/* disable */
-	wdtpci_ctr_mode(0,3);		/* Program CTR0 for Mode 3: Square Wave Generator */
-	wdtpci_ctr_mode(1,2);		/* Program CTR1 for Mode 2: Rate Generator */
-	wdtpci_ctr_mode(2,1);		/* Program CTR2 for Mode 1: Retriggerable One-Shot */
-	wdtpci_ctr_load(0,20833);	/* count at 100Hz */
-	wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */
+	inb(WDT_DC);			/* Disable watchdog */
+	udelay(8);
+	wdtpci_ctr_mode(2, 0);		/* Program CTR2 for Mode 0:
+						Pulse on Terminal Count */
+	outb(0, WDT_DC);		/* Enable watchdog */
+	udelay(8);
+	inb(WDT_DC);			/* Disable watchdog */
+	udelay(8);
+	outb(0, WDT_CLOCK);		/* 2.0833MHz clock */
+	udelay(8);
+	inb(WDT_BUZZER);		/* disable */
+	udelay(8);
+	inb(WDT_OPTONOTRST);		/* disable */
+	udelay(8);
+	inb(WDT_OPTORST);		/* disable */
+	udelay(8);
+	inb(WDT_PROGOUT);		/* disable */
+	udelay(8);
+	wdtpci_ctr_mode(0, 3);		/* Program CTR0 for Mode 3:
+						Square Wave Generator */
+	wdtpci_ctr_mode(1, 2);		/* Program CTR1 for Mode 2:
+						Rate Generator */
+	wdtpci_ctr_mode(2, 1);		/* Program CTR2 for Mode 1:
+						Retriggerable One-Shot */
+	wdtpci_ctr_load(0, 20833);	/* count at 100Hz */
+	wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
 	/* DO NOT LOAD CTR2 on PCI card! -- JPN */
-	outb_p(0, WDT_DC);		/* Enable watchdog */
+	outb(0, WDT_DC);		/* Enable watchdog */
+	udelay(8);
 
 	spin_unlock_irqrestore(&wdtpci_lock, flags);
 	return 0;
@@ -162,14 +184,15 @@ static int wdtpci_start(void)
  *	Stop the watchdog driver.
  */
 
-static int wdtpci_stop (void)
+static int wdtpci_stop(void)
 {
 	unsigned long flags;
 
 	/* Turn the card off */
 	spin_lock_irqsave(&wdtpci_lock, flags);
-	inb_p(WDT_DC);			/* Disable watchdog */
-	wdtpci_ctr_load(2,0);		/* 0 length reset pulses now */
+	inb(WDT_DC);			/* Disable watchdog */
+	udelay(8);
+	wdtpci_ctr_load(2, 0);		/* 0 length reset pulses now */
 	spin_unlock_irqrestore(&wdtpci_lock, flags);
 	return 0;
 }
@@ -177,20 +200,23 @@ static int wdtpci_stop (void)
 /**
  *	wdtpci_ping:
  *
- *	Reload counter one with the watchdog heartbeat. We don't bother reloading
- *	the cascade counter.
+ *	Reload counter one with the watchdog heartbeat. We don't bother
+ *	reloading the cascade counter.
  */
 
 static int wdtpci_ping(void)
 {
 	unsigned long flags;
 
-	/* Write a watchdog value */
 	spin_lock_irqsave(&wdtpci_lock, flags);
-	inb_p(WDT_DC);			/* Disable watchdog */
-	wdtpci_ctr_mode(1,2);		/* Re-Program CTR1 for Mode 2: Rate Generator */
-	wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */
-	outb_p(0, WDT_DC);		/* Enable watchdog */
+	/* Write a watchdog value */
+	inb(WDT_DC);			/* Disable watchdog */
+	udelay(8);
+	wdtpci_ctr_mode(1, 2);		/* Re-Program CTR1 for Mode 2:
+							Rate Generator */
+	wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
+	outb(0, WDT_DC);		/* Enable watchdog */
+	udelay(8);
 	spin_unlock_irqrestore(&wdtpci_lock, flags);
 	return 0;
 }
@@ -199,14 +225,14 @@ static int wdtpci_ping(void)
  *	wdtpci_set_heartbeat:
  *	@t:		the new heartbeat value that needs to be set.
  *
- *	Set a new heartbeat value for the watchdog device. If the heartbeat value is
- *	incorrect we keep the old value and return -EINVAL. If successfull we
- *	return 0.
+ *	Set a new heartbeat value for the watchdog device. If the heartbeat
+ *	value is incorrect we keep the old value and return -EINVAL.
+ *	If successful we return 0.
  */
 static int wdtpci_set_heartbeat(int t)
 {
 	/* Arbitrary, can't find the card's limits */
-	if ((t < 1) || (t > 65535))
+	if (t < 1 || t > 65535)
 		return -EINVAL;
 
 	heartbeat = t;
@@ -227,9 +253,14 @@ static int wdtpci_set_heartbeat(int t)
 
 static int wdtpci_get_status(int *status)
 {
-	unsigned char new_status=inb_p(WDT_SR);
+	unsigned char new_status;
+	unsigned long flags;
+
+	spin_lock_irqsave(&wdtpci_lock, flags);
+	new_status = inb(WDT_SR);
+	spin_unlock_irqrestore(&wdtpci_lock, flags);
 
-	*status=0;
+	*status = 0;
 	if (new_status & WDC_SR_ISOI0)
 		*status |= WDIOF_EXTERN1;
 	if (new_status & WDC_SR_ISII1)
@@ -259,8 +290,12 @@ static int wdtpci_get_status(int *status)
 
 static int wdtpci_get_temperature(int *temperature)
 {
-	unsigned short c=inb_p(WDT_RT);
-
+	unsigned short c;
+	unsigned long flags;
+	spin_lock_irqsave(&wdtpci_lock, flags);
+	c = inb(WDT_RT);
+	udelay(8);
+	spin_unlock_irqrestore(&wdtpci_lock, flags);
 	*temperature = (c * 11 / 15) + 7;
 	return 0;
 }
@@ -282,17 +317,25 @@ static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
 	 *	Read the status register see what is up and
 	 *	then printk it.
 	 */
-	unsigned char status=inb_p(WDT_SR);
+	unsigned char status;
+
+	spin_lock(&wdtpci_lock);
+
+	status = inb(WDT_SR);
+	udelay(8);
 
 	printk(KERN_CRIT PFX "status %d\n", status);
 
 #ifdef CONFIG_WDT_501_PCI
-	if (!(status & WDC_SR_TGOOD))
- 		printk(KERN_CRIT PFX "Overheat alarm.(%d)\n",inb_p(WDT_RT));
+	if (!(status & WDC_SR_TGOOD)) {
+		u8 alarm = inb(WDT_RT);
+		printk(KERN_CRIT PFX "Overheat alarm.(%d)\n", alarm);
+		udelay(8);
+	}
 	if (!(status & WDC_SR_PSUOVER))
- 		printk(KERN_CRIT PFX "PSU over voltage.\n");
+		printk(KERN_CRIT PFX "PSU over voltage.\n");
 	if (!(status & WDC_SR_PSUUNDR))
- 		printk(KERN_CRIT PFX "PSU under voltage.\n");
+		printk(KERN_CRIT PFX "PSU under voltage.\n");
 	if (tachometer) {
 		if (!(status & WDC_SR_FANGOOD))
 			printk(KERN_CRIT PFX "Possible fan fault.\n");
@@ -310,6 +353,7 @@ static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
 		printk(KERN_CRIT PFX "Reset in 5ms.\n");
 #endif
 	}
+	spin_unlock(&wdtpci_lock);
 	return IRQ_HANDLED;
 }
 
@@ -325,7 +369,8 @@ static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
  *	write of data will do, as we we don't define content meaning.
  */
 
-static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+static ssize_t wdtpci_write(struct file *file, const char __user *buf,
+					size_t count, loff_t *ppos)
 {
 	if (count) {
 		if (!nowayout) {
@@ -335,7 +380,7 @@ static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t co
 
 			for (i = 0; i != count; i++) {
 				char c;
-				if(get_user(c, buf+i))
+				if (get_user(c, buf+i))
 					return -EFAULT;
 				if (c == 'V')
 					expect_close = 42;
@@ -343,13 +388,11 @@ static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t co
 		}
 		wdtpci_ping();
 	}
-
 	return count;
 }
 
 /**
  *	wdtpci_ioctl:
- *	@inode: inode of the device
  *	@file: file handle to the device
  *	@cmd: watchdog command
  *	@arg: argument pointer
@@ -359,8 +402,8 @@ static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t co
  *	querying capabilities and current status.
  */
 
-static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
-	unsigned long arg)
+static long wdtpci_ioctl(struct file *file, unsigned int cmd,
+							unsigned long arg)
 {
 	int new_heartbeat;
 	int status;
@@ -383,33 +426,29 @@ static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd
 		ident.options |= WDIOF_FANFAULT;
 #endif /* CONFIG_WDT_501_PCI */
 
-	switch(cmd)
-	{
-		default:
-			return -ENOTTY;
-		case WDIOC_GETSUPPORT:
-			return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
-
-		case WDIOC_GETSTATUS:
-			wdtpci_get_status(&status);
-			return put_user(status, p);
-		case WDIOC_GETBOOTSTATUS:
-			return put_user(0, p);
-		case WDIOC_KEEPALIVE:
-			wdtpci_ping();
-			return 0;
-		case WDIOC_SETTIMEOUT:
-			if (get_user(new_heartbeat, p))
-				return -EFAULT;
-
-			if (wdtpci_set_heartbeat(new_heartbeat))
-				return -EINVAL;
-
-			wdtpci_ping();
-			/* Fall */
-		case WDIOC_GETTIMEOUT:
-			return put_user(heartbeat, p);
-	}
+	switch (cmd) {
+	default:
+		return -ENOTTY;
+	case WDIOC_GETSUPPORT:
+		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
+	case WDIOC_GETSTATUS:
+		wdtpci_get_status(&status);
+		return put_user(status, p);
+	case WDIOC_GETBOOTSTATUS:
+		return put_user(0, p);
+	case WDIOC_KEEPALIVE:
+		wdtpci_ping();
+		return 0;
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_heartbeat, p))
+			return -EFAULT;
+		if (wdtpci_set_heartbeat(new_heartbeat))
+			return -EINVAL;
+		wdtpci_ping();
+		/* Fall */
+	case WDIOC_GETTIMEOUT:
+		return put_user(heartbeat, p);
+		}
 }
 
 /**
@@ -426,12 +465,11 @@ static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd
 
 static int wdtpci_open(struct inode *inode, struct file *file)
 {
-	if (down_trylock(&open_sem))
+	if (test_and_set_bit(0, &open_lock))
 		return -EBUSY;
 
-	if (nowayout) {
+	if (nowayout)
 		__module_get(THIS_MODULE);
-	}
 	/*
 	 *	Activate
 	 */
@@ -460,7 +498,7 @@ static int wdtpci_release(struct inode *inode, struct file *file)
 		wdtpci_ping();
 	}
 	expect_close = 0;
-	up(&open_sem);
+	clear_bit(0, &open_lock);
 	return 0;
 }
 
@@ -476,14 +514,15 @@ static int wdtpci_release(struct inode *inode, struct file *file)
  *	fahrenheit. It was designed by an imperial measurement luddite.
  */
 
-static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr)
+static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
+						size_t count, loff_t *ptr)
 {
 	int temperature;
 
 	if (wdtpci_get_temperature(&temperature))
 		return -EFAULT;
 
-	if (copy_to_user (buf, &temperature, 1))
+	if (copy_to_user(buf, &temperature, 1))
 		return -EFAULT;
 
 	return 1;
@@ -529,12 +568,10 @@ static int wdtpci_temp_release(struct inode *inode, struct file *file)
  */
 
 static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
-	void *unused)
+							void *unused)
 {
-	if (code==SYS_DOWN || code==SYS_HALT) {
-		/* Turn the card off */
+	if (code == SYS_DOWN || code == SYS_HALT)
 		wdtpci_stop();
-	}
 	return NOTIFY_DONE;
 }
 
@@ -547,7 +584,7 @@ static const struct file_operations wdtpci_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
 	.write		= wdtpci_write,
-	.ioctl		= wdtpci_ioctl,
+	.unlocked_ioctl	= wdtpci_ioctl,
 	.open		= wdtpci_open,
 	.release	= wdtpci_release,
 };
@@ -584,80 +621,85 @@ static struct notifier_block wdtpci_notifier = {
 };
 
 
-static int __devinit wdtpci_init_one (struct pci_dev *dev,
-				   const struct pci_device_id *ent)
+static int __devinit wdtpci_init_one(struct pci_dev *dev,
+					const struct pci_device_id *ent)
 {
 	int ret = -EIO;
 
 	dev_count++;
 	if (dev_count > 1) {
-		printk (KERN_ERR PFX "this driver only supports 1 device\n");
+		printk(KERN_ERR PFX "This driver only supports one device\n");
 		return -ENODEV;
 	}
 
-	if (pci_enable_device (dev)) {
-		printk (KERN_ERR PFX "Not possible to enable PCI Device\n");
+	if (pci_enable_device(dev)) {
+		printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 		return -ENODEV;
 	}
 
-	if (pci_resource_start (dev, 2) == 0x0000) {
-		printk (KERN_ERR PFX "No I/O-Address for card detected\n");
+	if (pci_resource_start(dev, 2) == 0x0000) {
+		printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 		ret = -ENODEV;
 		goto out_pci;
 	}
 
-	sema_init(&open_sem, 1);
-
 	irq = dev->irq;
-	io = pci_resource_start (dev, 2);
+	io = pci_resource_start(dev, 2);
 
-	if (request_region (io, 16, "wdt_pci") == NULL) {
-		printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", io);
+	if (request_region(io, 16, "wdt_pci") == NULL) {
+		printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", io);
 		goto out_pci;
 	}
 
-	if (request_irq (irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED,
+	if (request_irq(irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED,
 			 "wdt_pci", &wdtpci_miscdev)) {
-		printk (KERN_ERR PFX "IRQ %d is not free\n", irq);
+		printk(KERN_ERR PFX "IRQ %d is not free\n", irq);
 		goto out_reg;
 	}
 
-	printk ("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n",
-		io, irq);
+	printk(KERN_INFO
+	 "PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n",
+								io, irq);
 
-	/* Check that the heartbeat value is within it's range ; if not reset to the default */
+	/* Check that the heartbeat value is within its range;
+	   if not reset to the default */
 	if (wdtpci_set_heartbeat(heartbeat)) {
 		wdtpci_set_heartbeat(WD_TIMO);
-		printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
-			WD_TIMO);
+		printk(KERN_INFO PFX
+		  "heartbeat value must be 0 < heartbeat < 65536, using %d\n",
+								WD_TIMO);
 	}
 
-	ret = register_reboot_notifier (&wdtpci_notifier);
+	ret = register_reboot_notifier(&wdtpci_notifier);
 	if (ret) {
-		printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", ret);
+		printk(KERN_ERR PFX
+			"cannot register reboot notifier (err=%d)\n", ret);
 		goto out_irq;
 	}
 
 #ifdef CONFIG_WDT_501_PCI
-	ret = misc_register (&temp_miscdev);
+	ret = misc_register(&temp_miscdev);
 	if (ret) {
-		printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
-			TEMP_MINOR, ret);
+		printk(KERN_ERR PFX
+			"cannot register miscdev on minor=%d (err=%d)\n",
+					TEMP_MINOR, ret);
 		goto out_rbt;
 	}
 #endif /* CONFIG_WDT_501_PCI */
 
-	ret = misc_register (&wdtpci_miscdev);
+	ret = misc_register(&wdtpci_miscdev);
 	if (ret) {
-		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 out_misc;
 	}
 
 	printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 		heartbeat, nowayout);
 #ifdef CONFIG_WDT_501_PCI
-	printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled"));
+	printk(KERN_INFO "wdt: Fan Tachometer is %s\n",
+				(tachometer ? "Enabled" : "Disabled"));
 #endif /* CONFIG_WDT_501_PCI */
 
 	ret = 0;
@@ -673,14 +715,14 @@ out_rbt:
 out_irq:
 	free_irq(irq, &wdtpci_miscdev);
 out_reg:
-	release_region (io, 16);
+	release_region(io, 16);
 out_pci:
 	pci_disable_device(dev);
 	goto out;
 }
 
 
-static void __devexit wdtpci_remove_one (struct pci_dev *pdev)
+static void __devexit wdtpci_remove_one(struct pci_dev *pdev)
 {
 	/* here we assume only one device will ever have
 	 * been picked up and registered by probe function */
@@ -728,7 +770,7 @@ static struct pci_driver wdtpci_driver = {
 
 static void __exit wdtpci_cleanup(void)
 {
-	pci_unregister_driver (&wdtpci_driver);
+	pci_unregister_driver(&wdtpci_driver);
 }
 
 
@@ -742,7 +784,7 @@ static void __exit wdtpci_cleanup(void)
 
 static int __init wdtpci_init(void)
 {
-	return pci_register_driver (&wdtpci_driver);
+	return pci_register_driver(&wdtpci_driver);
 }