[WATCHDOG 44/57] scx200_wdt: clean up and switch to unlocked_ioctl

Review and switch to unlocked_ioctl

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

1 files changed, 30 insertions, 29 deletions

diff --git a/drivers/watchdog/scx200_wdt.c b/drivers/watchdog/scx200_wdt.c
index d55882bca319..7c1de94704f3 100644
--- a/drivers/watchdog/scx200_wdt.c
+++ b/drivers/watchdog/scx200_wdt.c
@@ -27,9 +27,8 @@
 #include <linux/fs.h>
 #include <linux/ioport.h>
 #include <linux/scx200.h>
-
-#include <asm/uaccess.h>
-#include <asm/io.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
 
 #define NAME "scx200_wdt"
 
@@ -47,8 +46,9 @@ module_param(nowayout, int, 0);
 MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
 
 static u16 wdto_restart;
-static struct semaphore open_semaphore;
 static char expect_close;
+static unsigned long open_lock;
+static DEFINE_SPINLOCK(scx_lock);
 
 /* Bits of the WDCNFG register */
 #define W_ENABLE 0x00fa         /* Enable watchdog */
@@ -59,7 +59,9 @@ static char expect_close;
 
 static void scx200_wdt_ping(void)
 {
+        spin_lock(&scx_lock);
         outw(wdto_restart, scx200_cb_base + SCx200_WDT_WDTO);
+        spin_unlock(&scx_lock);
 }
 
 static void scx200_wdt_update_margin(void)
@@ -73,9 +75,11 @@ static void scx200_wdt_enable(void)
         printk(KERN_DEBUG NAME ": enabling watchdog timer, wdto_restart = %d\n",
                wdto_restart);
 
+        spin_lock(&scx_lock);
         outw(0, scx200_cb_base + SCx200_WDT_WDTO);
         outb(SCx200_WDT_WDSTS_WDOVF, scx200_cb_base + SCx200_WDT_WDSTS);
         outw(W_ENABLE, scx200_cb_base + SCx200_WDT_WDCNFG);
+        spin_unlock(&scx_lock);
 
         scx200_wdt_ping();
 }
@@ -84,15 +88,17 @@ static void scx200_wdt_disable(void)
 {
         printk(KERN_DEBUG NAME ": disabling watchdog timer\n");
 
+        spin_lock(&scx_lock);
         outw(0, scx200_cb_base + SCx200_WDT_WDTO);
         outb(SCx200_WDT_WDSTS_WDOVF, scx200_cb_base + SCx200_WDT_WDSTS);
         outw(W_DISABLE, scx200_cb_base + SCx200_WDT_WDCNFG);
+        spin_unlock(&scx_lock);
 }
 
 static int scx200_wdt_open(struct inode *inode, struct file *file)
 {
         /* only allow one at a time */
-        if (down_trylock(&open_semaphore))
+        if (test_and_set_bit(0, &open_lock))
                 return -EBUSY;
         scx200_wdt_enable();
 
@@ -101,13 +107,12 @@ static int scx200_wdt_open(struct inode *inode, struct file *file)
 
 static int scx200_wdt_release(struct inode *inode, struct file *file)
 {
-        if (expect_close != 42) {
+        if (expect_close != 42)
                 printk(KERN_WARNING NAME ": watchdog device closed unexpectedly, will not disable the watchdog timer\n");
-        } else if (!nowayout) {
+        else if (!nowayout)
                 scx200_wdt_disable();
-        }
         expect_close = 0;
-        up(&open_semaphore);
+        clear_bit(0, &open_lock);
 
         return 0;
 }
@@ -122,8 +127,7 @@ static int scx200_wdt_notify_sys(struct notifier_block *this,
         return NOTIFY_DONE;
 }
 
-static struct notifier_block scx200_wdt_notifier =
-{
+static struct notifier_block scx200_wdt_notifier = {
         .notifier_call = scx200_wdt_notify_sys,
 };
 
@@ -131,8 +135,7 @@ static ssize_t scx200_wdt_write(struct file *file, const char __user *data,
                                      size_t len, loff_t *ppos)
 {
         /* check for a magic close character */
-        if (len)
-        {
+        if (len) {
                 size_t i;
 
                 scx200_wdt_ping();
@@ -152,15 +155,15 @@ static ssize_t scx200_wdt_write(struct file *file, const char __user *data,
         return 0;
 }
 
-static int scx200_wdt_ioctl(struct inode *inode, struct file *file,
-        unsigned int cmd, unsigned long arg)
+static long scx200_wdt_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 = {
+        static const struct watchdog_info ident = {
                 .identity = "NatSemi SCx200 Watchdog",
                 .firmware_version = 1,
-                .options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING),
+                .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
         };
         int new_margin;
 
@@ -168,7 +171,7 @@ static int scx200_wdt_ioctl(struct inode *inode, struct file *file,
         default:
                 return -ENOTTY;
         case WDIOC_GETSUPPORT:
-                if(copy_to_user(argp, &ident, sizeof(ident)))
+                if (copy_to_user(argp, &ident, sizeof(ident)))
                         return -EFAULT;
                 return 0;
         case WDIOC_GETSTATUS:
@@ -195,18 +198,18 @@ static int scx200_wdt_ioctl(struct inode *inode, struct file *file,
 }
 
 static const struct file_operations scx200_wdt_fops = {
-        .owner   = THIS_MODULE,
-        .llseek  = no_llseek,
-        .write   = scx200_wdt_write,
-        .ioctl   = scx200_wdt_ioctl,
-        .open    = scx200_wdt_open,
+        .owner = THIS_MODULE,
+        .llseek = no_llseek,
+        .write = scx200_wdt_write,
+        .unlocked_ioctl = scx200_wdt_ioctl,
+        .open = scx200_wdt_open,
         .release = scx200_wdt_release,
 };
 
 static struct miscdevice scx200_wdt_miscdev = {
         .minor = WATCHDOG_MINOR,
-        .name  = "watchdog",
-        .fops  = &scx200_wdt_fops,
+        .name = "watchdog",
+        .fops = &scx200_wdt_fops,
 };
 
 static int __init scx200_wdt_init(void)
@@ -229,8 +232,6 @@ static int __init scx200_wdt_init(void)
         scx200_wdt_update_margin();
         scx200_wdt_disable();
 
-        sema_init(&open_semaphore, 1);
-
         r = register_reboot_notifier(&scx200_wdt_notifier);
         if (r) {
                 printk(KERN_ERR NAME ": unable to register reboot notifier");
@@ -263,7 +264,7 @@ module_exit(scx200_wdt_cleanup);
 
 /*
     Local variables:
-        compile-command: "make -k -C ../.. SUBDIRS=drivers/char modules"
-        c-basic-offset: 8
+        compile-command: "make -k -C ../.. SUBDIRS=drivers/char modules"
+        c-basic-offset: 8
     End:
 */