[WATCHDOG 45/57] shwdt: coding style, cleanup, 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, 82 insertions, 57 deletions

diff --git a/drivers/watchdog/shwdt.c b/drivers/watchdog/shwdt.c
index 1277f7e9cc54..60f0036aaca6 100644
--- a/drivers/watchdog/shwdt.c
+++ b/drivers/watchdog/shwdt.c
@@ -28,9 +28,9 @@
 #include <linux/ioport.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/watchdog.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <linux/watchdog.h>
 
 #define PFX "shwdt: "
 
@@ -72,6 +72,7 @@ static struct watchdog_info sh_wdt_info;
 static char shwdt_expect_close;
 static DEFINE_TIMER(timer, sh_wdt_ping, 0, 0);
 static unsigned long next_heartbeat;
+static DEFINE_SPINLOCK(shwdt_lock);
 
 #define WATCHDOG_HEARTBEAT 30                   /* 30 sec default heartbeat */
 static int heartbeat = WATCHDOG_HEARTBEAT;      /* in seconds */
@@ -86,6 +87,9 @@ static int nowayout = WATCHDOG_NOWAYOUT;
 static void sh_wdt_start(void)
 {
         __u8 csr;
+        unsigned long flags;
+
+        spin_lock_irqsave(&wdt_lock, flags);
 
         next_heartbeat = jiffies + (heartbeat * HZ);
         mod_timer(&timer, next_ping_period(clock_division_ratio));
@@ -123,6 +127,7 @@ static void sh_wdt_start(void)
         csr &= ~RSTCSR_RSTS;
         sh_wdt_write_rstcsr(csr);
 #endif
+        spin_unlock_irqrestore(&wdt_lock, flags);
 }
 
 /**
@@ -132,12 +137,16 @@ static void sh_wdt_start(void)
 static void sh_wdt_stop(void)
 {
         __u8 csr;
+        unsigned long flags;
+
+        spin_lock_irqsave(&wdt_lock, flags);
 
         del_timer(&timer);
 
         csr = sh_wdt_read_csr();
         csr &= ~WTCSR_TME;
         sh_wdt_write_csr(csr);
+        spin_unlock_irqrestore(&wdt_lock, flags);
 }
 
 /**
@@ -146,7 +155,11 @@ static void sh_wdt_stop(void)
  */
 static inline void sh_wdt_keepalive(void)
 {
+        unsigned long flags;
+
+        spin_lock_irqsave(&wdt_lock, flags);
         next_heartbeat = jiffies + (heartbeat * HZ);
+        spin_unlock_irqrestore(&wdt_lock, flags);
 }
 
 /**
@@ -155,10 +168,14 @@ static inline void sh_wdt_keepalive(void)
  */
 static int sh_wdt_set_heartbeat(int t)
 {
-        if (unlikely((t < 1) || (t > 3600))) /* arbitrary upper limit */
+        unsigned long flags;
+
+        if (unlikely(t < 1 || t > 3600)) /* arbitrary upper limit */
                 return -EINVAL;
 
+        spin_lock_irqsave(&wdt_lock, flags);
         heartbeat = t;
+        spin_unlock_irqrestore(&wdt_lock, flags);
         return 0;
 }
 
@@ -170,6 +187,9 @@ static int sh_wdt_set_heartbeat(int t)
  */
 static void sh_wdt_ping(unsigned long data)
 {
+        unsigned long flags;
+
+        spin_lock_irqsave(&wdt_lock, flags);
         if (time_before(jiffies, next_heartbeat)) {
                 __u8 csr;
 
@@ -183,6 +203,7 @@ static void sh_wdt_ping(unsigned long data)
         } else
                 printk(KERN_WARNING PFX "Heartbeat lost! Will not ping "
                        "the watchdog\n");
+        spin_unlock_irqrestore(&wdt_lock, flags);
 }
 
 /**
@@ -310,7 +331,6 @@ static int sh_wdt_mmap(struct file *file, struct vm_area_struct *vma)
 
 /**
  *      sh_wdt_ioctl - Query Device
- *      @inode: inode of device
  *      @file: file handle of device
  *      @cmd: watchdog command
  *      @arg: argument
@@ -318,53 +338,51 @@ static int sh_wdt_mmap(struct file *file, struct vm_area_struct *vma)
  *      Query basic information from the device or ping it, as outlined by the
  *      watchdog API.
  */
-static int sh_wdt_ioctl(struct inode *inode, struct file *file,
-                        unsigned int cmd, unsigned long arg)
+static long sh_wdt_ioctl(struct file *file, unsigned int cmd,
+                                                        unsigned long arg)
 {
         int new_heartbeat;
         int options, retval = -EINVAL;
 
         switch (cmd) {
-                case WDIOC_GETSUPPORT:
-                        return copy_to_user((struct watchdog_info *)arg,
-                                          &sh_wdt_info,
-                                          sizeof(sh_wdt_info)) ? -EFAULT : 0;
-                case WDIOC_GETSTATUS:
-                case WDIOC_GETBOOTSTATUS:
-                        return put_user(0, (int *)arg);
-                case WDIOC_KEEPALIVE:
-                        sh_wdt_keepalive();
-                        return 0;
-                case WDIOC_SETTIMEOUT:
-                        if (get_user(new_heartbeat, (int *)arg))
-                                return -EFAULT;
-
-                        if (sh_wdt_set_heartbeat(new_heartbeat))
-                                return -EINVAL;
-
-                        sh_wdt_keepalive();
-                        /* Fall */
-                case WDIOC_GETTIMEOUT:
-                        return put_user(heartbeat, (int *)arg);
-                case WDIOC_SETOPTIONS:
-                        if (get_user(options, (int *)arg))
-                                return -EFAULT;
-
-                        if (options & WDIOS_DISABLECARD) {
-                                sh_wdt_stop();
-                                retval = 0;
-                        }
+        case WDIOC_GETSUPPORT:
+                return copy_to_user((struct watchdog_info *)arg,
+                          &sh_wdt_info, sizeof(sh_wdt_info)) ? -EFAULT : 0;
+        case WDIOC_GETSTATUS:
+        case WDIOC_GETBOOTSTATUS:
+                return put_user(0, (int *)arg);
+        case WDIOC_KEEPALIVE:
+                sh_wdt_keepalive();
+                return 0;
+        case WDIOC_SETTIMEOUT:
+                if (get_user(new_heartbeat, (int *)arg))
+                        return -EFAULT;
 
-                        if (options & WDIOS_ENABLECARD) {
-                                sh_wdt_start();
-                                retval = 0;
-                        }
+                if (sh_wdt_set_heartbeat(new_heartbeat))
+                        return -EINVAL;
 
-                        return retval;
-                default:
-                        return -ENOTTY;
-        }
+                sh_wdt_keepalive();
+                /* Fall */
+        case WDIOC_GETTIMEOUT:
+                return put_user(heartbeat, (int *)arg);
+        case WDIOC_SETOPTIONS:
+                if (get_user(options, (int *)arg))
+                        return -EFAULT;
+
+                if (options & WDIOS_DISABLECARD) {
+                        sh_wdt_stop();
+                        retval = 0;
+                }
+
+                if (options & WDIOS_ENABLECARD) {
+                        sh_wdt_start();
+                        retval = 0;
+                }
 
+                return retval;
+        default:
+                return -ENOTTY;
+        }
         return 0;
 }
 
@@ -390,13 +408,13 @@ static const struct file_operations sh_wdt_fops = {
         .owner          = THIS_MODULE,
         .llseek         = no_llseek,
         .write          = sh_wdt_write,
-        .ioctl          = sh_wdt_ioctl,
+        .unlocked_ioctl = sh_wdt_ioctl,
         .open           = sh_wdt_open,
         .release        = sh_wdt_close,
         .mmap           = sh_wdt_mmap,
 };
 
-static struct watchdog_info sh_wdt_info = {
+static const struct watchdog_info sh_wdt_info = {
         .options                = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
                                   WDIOF_MAGICCLOSE,
         .firmware_version       = 1,
@@ -422,30 +440,33 @@ static int __init sh_wdt_init(void)
 {
         int rc;
 
-        if ((clock_division_ratio < 0x5) || (clock_division_ratio > 0x7)) {
+        if (clock_division_ratio < 0x5 || clock_division_ratio > 0x7) {
                 clock_division_ratio = WTCSR_CKS_4096;
-                printk(KERN_INFO PFX "clock_division_ratio value must "
-                       "be 0x5<=x<=0x7, using %d\n", clock_division_ratio);
+                printk(KERN_INFO PFX
+                  "clock_division_ratio value must be 0x5<=x<=0x7, using %d\n",
+                                clock_division_ratio);
         }
 
         rc = sh_wdt_set_heartbeat(heartbeat);
         if (unlikely(rc)) {
                 heartbeat = WATCHDOG_HEARTBEAT;
-                printk(KERN_INFO PFX "heartbeat value must "
-                       "be 1<=x<=3600, using %d\n", heartbeat);
+                printk(KERN_INFO PFX
+                        "heartbeat value must be 1<=x<=3600, using %d\n",
+                                                                heartbeat);
         }
 
         rc = register_reboot_notifier(&sh_wdt_notifier);
         if (unlikely(rc)) {
-                printk(KERN_ERR PFX "Can't register reboot notifier (err=%d)\n",
-                       rc);
+                printk(KERN_ERR PFX
+                        "Can't register reboot notifier (err=%d)\n", rc);
                 return rc;
         }
 
         rc = misc_register(&sh_wdt_miscdev);
         if (unlikely(rc)) {
-                printk(KERN_ERR PFX "Can't register miscdev on "
-                       "minor=%d (err=%d)\n", sh_wdt_miscdev.minor, rc);
+                printk(KERN_ERR PFX
+                        "Can't register miscdev on minor=%d (err=%d)\n",
+                                                sh_wdt_miscdev.minor, rc);
                 unregister_reboot_notifier(&sh_wdt_notifier);
                 return rc;
         }
@@ -476,10 +497,14 @@ module_param(clock_division_ratio, int, 0);
 MODULE_PARM_DESC(clock_division_ratio, "Clock division ratio. Valid ranges are from 0x5 (1.31ms) to 0x7 (5.25ms). (default=" __MODULE_STRING(clock_division_ratio) ")");
 
 module_param(heartbeat, int, 0);
-MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (1<=heartbeat<=3600, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
+MODULE_PARM_DESC(heartbeat,
+        "Watchdog heartbeat in seconds. (1 <= heartbeat <= 3600, default="
+                                __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 
 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) ")");
 
 module_init(sh_wdt_init);
 module_exit(sh_wdt_exit);