[WATCHDOG 10/57] eurotechwdt: unlocked_ioctl, code lock check and 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, 36 insertions, 21 deletions

diff --git a/drivers/watchdog/eurotechwdt.c b/drivers/watchdog/eurotechwdt.c
index b14e9d1f164d..b94e6ef4c7a7 100644
--- a/drivers/watchdog/eurotechwdt.c
+++ b/drivers/watchdog/eurotechwdt.c
@@ -56,14 +56,15 @@
 #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>
 
 static unsigned long eurwdt_is_open;
 static int eurwdt_timeout;
 static char eur_expect_close;
+static spinlock_t eurwdt_lock;
 
 /*
  * You must set these - there is no sane way to probe for this board.
@@ -78,7 +79,9 @@ static char *ev = "int";
 
 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) ")");
 
 /*
  * Some symbolic names
@@ -137,7 +140,8 @@ static void eurwdt_activate_timer(void)
 {
         eurwdt_disable_timer();
         eurwdt_write_reg(WDT_CTRL_REG, 0x01);   /* activate the WDT */
-        eurwdt_write_reg(WDT_OUTPIN_CFG, !strcmp("int", ev) ? WDT_EVENT_INT : WDT_EVENT_REBOOT);
+        eurwdt_write_reg(WDT_OUTPIN_CFG,
+                !strcmp("int", ev) ? WDT_EVENT_INT : WDT_EVENT_REBOOT);
 
         /* Setting interrupt line */
         if (irq == 2 || irq > 15 || irq < 0) {
@@ -206,21 +210,21 @@ size_t count, loff_t *ppos)
 
                         for (i = 0; i != count; i++) {
                                 char c;
-                                if(get_user(c, buf+i))
+                                if (get_user(c, buf+i))
                                         return -EFAULT;
                                 if (c == 'V')
                                         eur_expect_close = 42;
                         }
                 }
+                spin_lock(&eurwdt_lock);
                 eurwdt_ping();  /* the default timeout */
+                spin_unlock(&eurwdt_lock);
         }
-
         return count;
 }
 
 /**
  * eurwdt_ioctl:
- * @inode: inode of the device
  * @file: file handle to the device
  * @cmd: watchdog command
  * @arg: argument pointer
@@ -229,13 +233,14 @@ size_t count, loff_t *ppos)
  * according to their available features.
  */
 
-static int eurwdt_ioctl(struct inode *inode, struct file *file,
-        unsigned int cmd, unsigned long arg)
+static long eurwdt_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,
+                .options          = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
+                                                        | WDIOF_MAGICCLOSE,
                 .firmware_version = 1,
                 .identity         = "WDT Eurotech CPU-1220/1410",
         };
@@ -243,7 +248,7 @@ static int eurwdt_ioctl(struct inode *inode, struct file *file,
         int time;
         int options, retval = -EINVAL;
 
-        switch(cmd) {
+        switch (cmd) {
         default:
                 return -ENOTTY;
 
@@ -255,7 +260,9 @@ static int eurwdt_ioctl(struct inode *inode, struct file *file,
                 return put_user(0, p);
 
         case WDIOC_KEEPALIVE:
+                spin_lock(&eurwdt_lock);
                 eurwdt_ping();
+                spin_unlock(&eurwdt_lock);
                 return 0;
 
         case WDIOC_SETTIMEOUT:
@@ -266,8 +273,10 @@ static int eurwdt_ioctl(struct inode *inode, struct file *file,
                 if (time < 0 || time > 255)
                         return -EINVAL;
 
+                spin_lock(&eurwdt_lock);
                 eurwdt_timeout = time;
                 eurwdt_set_timeout(time);
+                spin_unlock(&eurwdt_lock);
                 /* Fall */
 
         case WDIOC_GETTIMEOUT:
@@ -276,6 +285,7 @@ static int eurwdt_ioctl(struct inode *inode, struct file *file,
         case WDIOC_SETOPTIONS:
                 if (get_user(options, p))
                         return -EFAULT;
+                spin_lock(&eurwdt_lock);
                 if (options & WDIOS_DISABLECARD) {
                         eurwdt_disable_timer();
                         retval = 0;
@@ -285,6 +295,7 @@ static int eurwdt_ioctl(struct inode *inode, struct file *file,
                         eurwdt_ping();
                         retval = 0;
                 }
+                spin_unlock(&eurwdt_lock);
                 return retval;
         }
 }
@@ -322,10 +333,11 @@ static int eurwdt_open(struct inode *inode, struct file *file)
 
 static int eurwdt_release(struct inode *inode, struct file *file)
 {
-        if (eur_expect_close == 42) {
+        if (eur_expect_close == 42)
                 eurwdt_disable_timer();
-        } else {
-                printk(KERN_CRIT "eurwdt: Unexpected close, not stopping watchdog!\n");
+        else {
+                printk(KERN_CRIT
+                        "eurwdt: Unexpected close, not stopping watchdog!\n");
                 eurwdt_ping();
         }
         clear_bit(0, &eurwdt_is_open);
@@ -362,11 +374,11 @@ static int eurwdt_notify_sys(struct notifier_block *this, unsigned long code,
 
 
 static const struct file_operations eurwdt_fops = {
-        .owner  = THIS_MODULE,
-        .llseek = no_llseek,
-        .write  = eurwdt_write,
-        .ioctl  = eurwdt_ioctl,
-        .open   = eurwdt_open,
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .write          = eurwdt_write,
+        .unlocked_ioctl = eurwdt_ioctl,
+        .open           = eurwdt_open,
         .release        = eurwdt_release,
 };
 
@@ -419,7 +431,7 @@ static int __init eurwdt_init(void)
         int ret;
 
         ret = request_irq(irq, eurwdt_interrupt, IRQF_DISABLED, "eurwdt", NULL);
-        if(ret) {
+        if (ret) {
                 printk(KERN_ERR "eurwdt: IRQ %d is not free.\n", irq);
                 goto out;
         }
@@ -432,10 +444,13 @@ static int __init eurwdt_init(void)
 
         ret = register_reboot_notifier(&eurwdt_notifier);
         if (ret) {
-                printk(KERN_ERR "eurwdt: can't register reboot notifier (err=%d)\n", ret);
+                printk(KERN_ERR
+                    "eurwdt: can't register reboot notifier (err=%d)\n", ret);
                 goto outreg;
         }
 
+        spin_lock_init(&eurwdt_lock);
+
         ret = misc_register(&eurwdt_miscdev);
         if (ret) {
                 printk(KERN_ERR "eurwdt: can't misc_register on minor=%d\n",