Merge Linus' latest into master

[linux-2.6-microblaze.git] / drivers / watchdog / ixp2000_wdt.c

diff --git a/drivers/watchdog/ixp2000_wdt.c b/drivers/watchdog/ixp2000_wdt.c
index 4226dae..4f4b35a 100644 (file)
--- a/drivers/watchdog/ixp2000_wdt.c
+++ b/drivers/watchdog/ixp2000_wdt.c
@@ -25,42 +25,44 @@
 #include <linux/watchdog.h>
 #include <linux/init.h>
 #include <linux/bitops.h>
-
+#include <linux/uaccess.h>
 #include <mach/hardware.h>
-#include <asm/uaccess.h>
 
 static int nowayout = WATCHDOG_NOWAYOUT;
 static unsigned int heartbeat = 60;    /* (secs) Default is 1 minute */
 static unsigned long wdt_status;
+static spinlock_t wdt_lock;
 
 #define        WDT_IN_USE              0
 #define        WDT_OK_TO_CLOSE         1
 
 static unsigned long wdt_tick_rate;
 
-static void
-wdt_enable(void)
+static void wdt_enable(void)
 {
+       spin_lock(&wdt_lock);
        ixp2000_reg_write(IXP2000_RESET0, *(IXP2000_RESET0) | WDT_RESET_ENABLE);
        ixp2000_reg_write(IXP2000_TWDE, WDT_ENABLE);
        ixp2000_reg_write(IXP2000_T4_CLD, heartbeat * wdt_tick_rate);
        ixp2000_reg_write(IXP2000_T4_CTL, TIMER_DIVIDER_256 | TIMER_ENABLE);
+       spin_unlock(&wdt_lock);
 }
 
-static void
-wdt_disable(void)
+static void wdt_disable(void)
 {
+       spin_lock(&wdt_lock);
        ixp2000_reg_write(IXP2000_T4_CTL, 0);
+       spin_unlock(&wdt_lock);
 }
 
-static void
-wdt_keepalive(void)
+static void wdt_keepalive(void)
 {
+       spin_lock(&wdt_lock);
        ixp2000_reg_write(IXP2000_T4_CLD, heartbeat * wdt_tick_rate);
+       spin_unlock(&wdt_lock);
 }
 
-static int
-ixp2000_wdt_open(struct inode *inode, struct file *file)
+static int ixp2000_wdt_open(struct inode *inode, struct file *file)
 {
        if (test_and_set_bit(WDT_IN_USE, &wdt_status))
                return -EBUSY;
@@ -72,8 +74,8 @@ ixp2000_wdt_open(struct inode *inode, struct file *file)
        return nonseekable_open(inode, file);
 }
 
-static ssize_t
-ixp2000_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
+static ssize_t ixp2000_wdt_write(struct file *file, const char *data,
+                                               size_t len, loff_t *ppos)
 {
        if (len) {
                if (!nowayout) {
@@ -103,9 +105,8 @@ static struct watchdog_info ident = {
        .identity       = "IXP2000 Watchdog",
 };
 
-static int
-ixp2000_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
-                       unsigned long arg)
+static long ixp2000_wdt_ioctl(struct file *file, unsigned int cmd,
+                                                       unsigned long arg)
 {
        int ret = -ENOTTY;
        int time;
@@ -124,6 +125,11 @@ ixp2000_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
                ret = put_user(0, (int *)arg);
                break;
 
+       case WDIOC_KEEPALIVE:
+               wdt_enable();
+               ret = 0;
+               break;
+
        case WDIOC_SETTIMEOUT:
                ret = get_user(time, (int *)arg);
                if (ret)
@@ -141,26 +147,18 @@ ixp2000_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
        case WDIOC_GETTIMEOUT:
                ret = put_user(heartbeat, (int *)arg);
                break;
-
-       case WDIOC_KEEPALIVE:
-               wdt_enable();
-               ret = 0;
-               break;
        }
 
        return ret;
 }
 
-static int
-ixp2000_wdt_release(struct inode *inode, struct file *file)
+static int ixp2000_wdt_release(struct inode *inode, struct file *file)
 {
-       if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) {
+       if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
                wdt_disable();
-       } else {
+       else
                printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - "
                                        "timer will not stop\n");
-       }
-
        clear_bit(WDT_IN_USE, &wdt_status);
        clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
 
@@ -168,18 +166,16 @@ ixp2000_wdt_release(struct inode *inode, struct file *file)
 }
 
 
-static const struct file_operations ixp2000_wdt_fops =
-{
+static const struct file_operations ixp2000_wdt_fops = {
        .owner          = THIS_MODULE,
        .llseek         = no_llseek,
        .write          = ixp2000_wdt_write,
-       .ioctl          = ixp2000_wdt_ioctl,
+       .unlocked_ioctl = ixp2000_wdt_ioctl,
        .open           = ixp2000_wdt_open,
        .release        = ixp2000_wdt_release,
 };
 
-static struct miscdevice ixp2000_wdt_miscdev =
-{
+static struct miscdevice ixp2000_wdt_miscdev = {
        .minor          = WATCHDOG_MINOR,
        .name           = "watchdog",
        .fops           = &ixp2000_wdt_fops,
@@ -191,9 +187,8 @@ static int __init ixp2000_wdt_init(void)
                printk(KERN_INFO "Unable to use IXP2000 watchdog due to IXP2800 erratum #25.\n");
                return -EIO;
        }
-
        wdt_tick_rate = (*IXP2000_T1_CLD * HZ) / 256;
-
+       spin_lock_init(&wdt_lock);
        return misc_register(&ixp2000_wdt_miscdev);
 }