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Commit 1780de41 authored by Alan Cox's avatar Alan Cox Committed by Wim Van Sebroeck
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[WATCHDOG 37/57] sbc60xxwdt: clean up and switch to unlocked_ioctl 



Review and switch to unlocked_ioctl

Signed-off-by: default avatarAlan Cox <alan@redhat.com>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent f19e0312

drivers/watchdog/sbc60xxwdt.c

+110 −113
Original line number Diff line number Diff line
@@ -16,19 +16,23 @@ 
 *

 *           12/4 - 2000      [Initial revision]

 *           25/4 - 2000      Added /dev/watchdog support

 *           09/5 - 2001      [smj@oro.net] fixed fop_write to "return 1" on success

 *           09/5 - 2001      [smj@oro.net] fixed fop_write to "return 1"

 *					on success

 *           12/4 - 2002      [rob@osinvestor.com] eliminate fop_read

 *                            fix possible wdt_is_open race

 *                            add CONFIG_WATCHDOG_NOWAYOUT support

 *                            remove lock_kernel/unlock_kernel pairs

 *                            added KERN_* to printk's

 *                            got rid of extraneous comments

 *                            changed watchdog_info to correctly reflect what the driver offers

 *                            added WDIOC_GETSTATUS, WDIOC_GETBOOTSTATUS, WDIOC_SETTIMEOUT,

 *                            WDIOC_GETTIMEOUT, and WDIOC_SETOPTIONS ioctls

 *                            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

 *                            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

 *                            made wdt_stop and wdt_start module params

 *                            added extra printk's for startup problems
@@ -56,9 +60,9 @@ 
#include <linux/notifier.h>

#include <linux/reboot.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/uaccess.h>



#include <asm/io.h>

#include <asm/uaccess.h>

#include <asm/system.h>



#define OUR_NAME "sbc60xxwdt"
@@ -94,13 +98,18 @@ MODULE_PARM_DESC(wdt_start, "SBC60xx WDT 'start' io port (default 0x443)"); 
 */



#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 */

static int timeout = WATCHDOG_TIMEOUT;	/* in seconds, multiplied by HZ to

					   get seconds to wait for a ping */

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);
@@ -117,15 +126,14 @@ 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 by reading from wdt_start */

		inb_p(wdt_start);

		/* 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");

}



/*
@@ -159,22 +167,21 @@ 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;
@@ -183,7 +190,8 @@ static ssize_t fop_write(struct file * file, const char __user * buf, size_t cou 
			}

		}



		/* 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;
@@ -209,27 +217,26 @@ static int fop_close(struct inode * inode, struct file * file) 
		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 = "SBC60xx",

	};



	switch(cmd)

	{

	switch (cmd) {

	default:

		return -ENOTTY;

	case WDIOC_GETSUPPORT:
@@ -243,30 +250,25 @@ static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd, 
	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;

		}



		if (new_options & WDIOS_ENABLECARD) {

			wdt_startup();

			retval = 0;

		}



		return retval;

	}

	case WDIOC_SETTIMEOUT:

	{

		int new_timeout;



		if (get_user(new_timeout, p))

			return -EFAULT;



			if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */

		/* arbitrary upper limit */

		if (new_timeout < 1 || new_timeout > 3600)

			return -EINVAL;



		timeout = new_timeout;
@@ -284,7 +286,7 @@ 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 = {
@@ -310,8 +312,7 @@ 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,

};
@@ -332,15 +333,14 @@ static int __init sbc60xxwdt_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",

		printk(KERN_INFO PFX

			"timeout value must be 1 <= x <= 3600, using %d\n",

								timeout);

	}



	if (!request_region(wdt_start, 1, "SBC 60XX WDT"))

	{

	if (!request_region(wdt_start, 1, "SBC 60XX WDT")) {

		printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",

			wdt_start);

		rc = -EIO;
@@ -348,11 +348,10 @@ static int __init sbc60xxwdt_init(void) 
	}



	/* We cannot reserve 0x45 - the kernel already has! */

	if ((wdt_stop != 0x45) && (wdt_stop != wdt_start))

	{

		if (!request_region(wdt_stop, 1, "SBC 60XX WDT"))

		{

			printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",

	if (wdt_stop != 0x45 && wdt_stop != wdt_start) {

		if (!request_region(wdt_stop, 1, "SBC 60XX WDT")) {

			printk(KERN_ERR PFX

				"I/O address 0x%04x already in use\n",

							wdt_stop);

			rc = -EIO;

			goto err_out_region1;
@@ -360,21 +359,19 @@ static int __init sbc60xxwdt_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",

	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 60XX single board computer initialised. timeout=%d sec (nowayout=%d)\n",

		timeout, nowayout);
@@ -383,7 +380,7 @@ static int __init sbc60xxwdt_init(void) 
err_out_reboot:

	unregister_reboot_notifier(&wdt_notifier);

err_out_region2:

	if ((wdt_stop != 0x45) && (wdt_stop != wdt_start))

	if (wdt_stop != 0x45 && wdt_stop != wdt_start)

		release_region(wdt_stop, 1);

err_out_region1:

	release_region(wdt_start, 1);