[WATCHDOG 03/57] ali: watchdog locking and style

Clean up and check locking

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

1 files changed, 118 insertions, 106 deletions

diff --git a/drivers/watchdog/alim7101_wdt.c b/drivers/watchdog/alim7101_wdt.c
index 238273c98656..c495f36c6aa9 100644
--- a/drivers/watchdog/alim7101_wdt.c
+++ b/drivers/watchdog/alim7101_wdt.c
@@ -32,8 +32,8 @@
 #include <linux/fs.h>
 #include <linux/pci.h>
 
-#include <asm/io.h>
-#include <asm/uaccess.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
 #include <asm/system.h>
 
 #define OUR_NAME "alim7101_wdt"
@@ -60,13 +60,17 @@
  */
 
 #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 use_gpio = 0; /* Use the pic (for a1d revision alim7101) */
+static int use_gpio; /* Use the pic (for a1d revision alim7101) */
 module_param(use_gpio, int, 0);
-MODULE_PARM_DESC(use_gpio, "Use the gpio watchdog.  (required by old cobalt boards)");
+MODULE_PARM_DESC(use_gpio,
+                "Use the gpio watchdog (required by old cobalt boards).");
 
 static void wdt_timer_ping(unsigned long);
 static DEFINE_TIMER(timer, wdt_timer_ping, 0, 1);
@@ -77,8 +81,9 @@ static struct pci_dev *alim7101_pmu;
 
 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) ")");
 
 /*
  *      Whack the dog
@@ -89,23 +94,26 @@ 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
          */
-        char    tmp;
+        char tmp;
 
-        if(time_before(jiffies, next_heartbeat))
-        {
+        if (time_before(jiffies, next_heartbeat)) {
                 /* Ping the WDT (this is actually a disarm/arm sequence) */
                 pci_read_config_byte(alim7101_pmu, 0x92, &tmp);
-                pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
-                pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM));
+                pci_write_config_byte(alim7101_pmu,
+                                        ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
+                pci_write_config_byte(alim7101_pmu,
+                                        ALI_7101_WDT, (tmp | ALI_WDT_ARM));
                 if (use_gpio) {
-                        pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp);
-                        pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp
-                                        | 0x20);
-                        pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp
-                                        & ~0x20);
+                        pci_read_config_byte(alim7101_pmu,
+                                        ALI_7101_GPIO_O, &tmp);
+                        pci_write_config_byte(alim7101_pmu,
+                                        ALI_7101_GPIO_O, tmp | 0x20);
+                        pci_write_config_byte(alim7101_pmu,
+                                        ALI_7101_GPIO_O, tmp & ~0x20);
                 }
         } else {
-                printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
+                printk(KERN_WARNING PFX
+                        "Heartbeat lost! Will not ping the watchdog\n");
         }
         /* Re-set the timer interval */
         mod_timer(&timer, jiffies + WDT_INTERVAL);
@@ -121,17 +129,23 @@ static void wdt_change(int writeval)
 
         pci_read_config_byte(alim7101_pmu, ALI_7101_WDT, &tmp);
         if (writeval == WDT_ENABLE) {
-                pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM));
+                pci_write_config_byte(alim7101_pmu,
+                                        ALI_7101_WDT, (tmp | ALI_WDT_ARM));
                 if (use_gpio) {
-                        pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp);
-                        pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp & ~0x20);
+                        pci_read_config_byte(alim7101_pmu,
+                                        ALI_7101_GPIO_O, &tmp);
+                        pci_write_config_byte(alim7101_pmu,
+                                        ALI_7101_GPIO_O, tmp & ~0x20);
                 }
 
         } else {
-                pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
+                pci_write_config_byte(alim7101_pmu,
+                                        ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
                 if (use_gpio) {
-                        pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp);
-                        pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp | 0x20);
+                        pci_read_config_byte(alim7101_pmu,
+                                        ALI_7101_GPIO_O, &tmp);
+                        pci_write_config_byte(alim7101_pmu,
+                                        ALI_7101_GPIO_O, tmp | 0x20);
                 }
         }
 }
@@ -169,10 +183,11 @@ 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 (count) {
                 if (!nowayout) {
                         size_t ofs;
 
@@ -195,119 +210,116 @@ static ssize_t fop_write(struct file * file, const char __user * buf, size_t cou
         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;
         /* Good, fire up the show */
         wdt_startup();
         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 {
                 /* wim: shouldn't there be a: 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 struct watchdog_info ident = {
+                .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
+                                                        | WDIOF_MAGICCLOSE,
                 .firmware_version = 1,
                 .identity = "ALiM7101",
         };
 
-        switch(cmd)
+        switch (cmd) {
+        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:
         {
-                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;
-                        }
-
-                        if(new_options & WDIOS_ENABLECARD) {
-                                wdt_startup();
-                                retval = 0;
-                        }
+                int new_options, retval = -EINVAL;
 
-                        return retval;
+                if (get_user(new_options, p))
+                        return -EFAULT;
+                if (new_options & WDIOS_DISABLECARD) {
+                        wdt_turnoff();
+                        retval = 0;
                 }
-                case WDIOC_SETTIMEOUT:
-                {
-                        int new_timeout;
-
-                        if(get_user(new_timeout, p))
-                                return -EFAULT;
-
-                        if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */
-                                return -EINVAL;
-
-                        timeout = new_timeout;
-                        wdt_keepalive();
-                        /* Fall through */
+                if (new_options & WDIOS_ENABLECARD) {
+                        wdt_startup();
+                        retval = 0;
                 }
-                case WDIOC_GETTIMEOUT:
-                        return put_user(timeout, p);
-                default:
-                        return -ENOTTY;
+                return retval;
+        }
+        case WDIOC_SETTIMEOUT:
+        {
+                int new_timeout;
+
+                if (get_user(new_timeout, p))
+                        return -EFAULT;
+                /* arbitrary upper limit */
+                if (new_timeout < 1 || new_timeout > 3600)
+                        return -EINVAL;
+                timeout = new_timeout;
+                wdt_keepalive();
+                /* Fall through */
+        }
+        case WDIOC_GETTIMEOUT:
+                return put_user(timeout, p);
+        default:
+                return -ENOTTY;
         }
 }
 
 static const struct file_operations wdt_fops = {
-        .owner=         THIS_MODULE,
-        .llseek=        no_llseek,
-        .write=         fop_write,
-        .open=          fop_open,
-        .release=       fop_close,
-        .ioctl=         fop_ioctl,
+        .owner          =       THIS_MODULE,
+        .llseek         =       no_llseek,
+        .write          =       fop_write,
+        .open           =       fop_open,
+        .release        =       fop_close,
+        .unlocked_ioctl =       fop_ioctl,
 };
 
 static struct miscdevice wdt_miscdev = {
-        .minor=WATCHDOG_MINOR,
-        .name="watchdog",
-        .fops=&wdt_fops,
+        .minor  =       WATCHDOG_MINOR,
+        .name   =       "watchdog",
+        .fops   =       &wdt_fops,
 };
 
 /*
  *      Notifier for system down
  */
 
-static int wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
+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();
 
-        if (code==SYS_RESTART) {
+        if (code == SYS_RESTART) {
                 /*
-                 * Cobalt devices have no way of rebooting themselves other than
-                 * getting the watchdog to pull reset, so we restart the watchdog on
-                 * reboot with no heartbeat
+                 * Cobalt devices have no way of rebooting themselves other
+                 * than getting the watchdog to pull reset, so we restart the
+                 * watchdog on reboot with no heartbeat
                  */
                 wdt_change(WDT_ENABLE);
                 printk(KERN_INFO PFX "Watchdog timer is now enabled with no heartbeat - should reboot in ~1 second.\n");
@@ -320,8 +332,7 @@ static int wdt_notify_sys(struct notifier_block *this, unsigned long code, void
  *      turn the timebomb registers off.
  */
 
-static struct notifier_block wdt_notifier=
-{
+static struct notifier_block wdt_notifier = {
         .notifier_call = wdt_notify_sys,
 };
 
@@ -354,7 +365,8 @@ static int __init alim7101_wdt_init(void)
         ali1543_south = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
                 NULL);
         if (!ali1543_south) {
-                printk(KERN_INFO PFX "ALi 1543 South-Bridge not present - WDT not set\n");
+                printk(KERN_INFO PFX
+                        "ALi 1543 South-Bridge not present - WDT not set\n");
                 goto err_out;
         }
         pci_read_config_byte(ali1543_south, 0x5e, &tmp);
@@ -363,24 +375,25 @@ static int __init alim7101_wdt_init(void)
                 if (!use_gpio) {
                         printk(KERN_INFO PFX "Detected old alim7101 revision 'a1d'.  If this is a cobalt board, set the 'use_gpio' module parameter.\n");
                         goto err_out;
-                } 
+                }
                 nowayout = 1;
         } else if ((tmp & 0x1e) != 0x12 && (tmp & 0x1e) != 0x00) {
                 printk(KERN_INFO PFX "ALi 1543 South-Bridge does not have the correct revision number (???1001?) - WDT not set\n");
                 goto err_out;
         }
 
-        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",
-                        timeout);
+                printk(KERN_INFO PFX
+                        "timeout value must be 1 <= x <= 3600, using %d\n",
+                                                                timeout);
         }
 
         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;
         }
 
@@ -391,9 +404,8 @@ static int __init alim7101_wdt_init(void)
                 goto err_out_reboot;
         }
 
-        if (nowayout) {
+        if (nowayout)
                 __module_get(THIS_MODULE);
-        }
 
         printk(KERN_INFO PFX "WDT driver for ALi M7101 initialised. timeout=%d sec (nowayout=%d)\n",
                 timeout, nowayout);