[WATCHDOG 30/57] omap_wdt: locking, unlocked_ioctl, tidy

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, 21 insertions, 14 deletions

diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
index 74bc39aa1ce8..ccdf069792d9 100644
--- a/drivers/watchdog/omap_wdt.c
+++ b/drivers/watchdog/omap_wdt.c
@@ -41,9 +41,9 @@
 #include <linux/clk.h>
 #include <linux/bitops.h>
 
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/hardware.h>
+#include </io.h>
+#include <linux/uaccess.h>
+#include <linux/hardware.h>
 
 #include <asm/arch/prcm.h>
 
@@ -54,11 +54,12 @@ module_param(timer_margin, uint, 0);
 MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
 
 static int omap_wdt_users;
-static struct clk *armwdt_ck = NULL;
-static struct clk *mpu_wdt_ick = NULL;
-static struct clk *mpu_wdt_fck = NULL;
+static struct clk *armwdt_ck;
+static struct clk *mpu_wdt_ick;
+static struct clk *mpu_wdt_fck;
 
 static unsigned int wdt_trgr_pattern = 0x1234;
+static spinlock_t wdt_lock;
 
 static void omap_wdt_ping(void)
 {
@@ -174,22 +175,23 @@ static int omap_wdt_release(struct inode *inode, struct file *file)
         return 0;
 }
 
-static ssize_t
-omap_wdt_write(struct file *file, const char __user *data,
+static ssize_t omap_wdt_write(struct file *file, const char __user *data,
                 size_t len, loff_t *ppos)
 {
         /* Refresh LOAD_TIME. */
-        if (len)
+        if (len) {
+                spin_lock(&wdt_lock);
                 omap_wdt_ping();
+                spin_unlock(&wdt_lock);
+        }
         return len;
 }
 
-static int
-omap_wdt_ioctl(struct inode *inode, struct file *file,
-        unsigned int cmd, unsigned long arg)
+static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
+                                                unsigned long arg)
 {
         int new_margin;
-        static struct watchdog_info ident = {
+        static const struct watchdog_info ident = {
                 .identity = "OMAP Watchdog",
                 .options = WDIOF_SETTIMEOUT,
                 .firmware_version = 0,
@@ -211,18 +213,22 @@ omap_wdt_ioctl(struct inode *inode, struct file *file,
                         return put_user(omap_prcm_get_reset_sources(),
                                         (int __user *)arg);
         case WDIOC_KEEPALIVE:
+                spin_lock(&wdt_lock);
                 omap_wdt_ping();
+                spin_unlock(&wdt_lock);
                 return 0;
         case WDIOC_SETTIMEOUT:
                 if (get_user(new_margin, (int __user *)arg))
                         return -EFAULT;
                 omap_wdt_adjust_timeout(new_margin);
 
+                spin_lock(&wdt_lock);
                 omap_wdt_disable();
                 omap_wdt_set_timeout();
                 omap_wdt_enable();
 
                 omap_wdt_ping();
+                spin_unlock(&wdt_lock);
                 /* Fall */
         case WDIOC_GETTIMEOUT:
                 return put_user(timer_margin, (int __user *)arg);
@@ -232,7 +238,7 @@ omap_wdt_ioctl(struct inode *inode, struct file *file,
 static const struct file_operations omap_wdt_fops = {
         .owner = THIS_MODULE,
         .write = omap_wdt_write,
-        .ioctl = omap_wdt_ioctl,
+        .unlocked_ioctl = omap_wdt_ioctl,
         .open = omap_wdt_open,
         .release = omap_wdt_release,
 };
@@ -373,6 +379,7 @@ static struct platform_driver omap_wdt_driver = {
 
 static int __init omap_wdt_init(void)
 {
+        spin_lock_init(&wdt_lock);
         return platform_driver_register(&omap_wdt_driver);
 }