[WATCHDOG 41/57] sb_wdog: 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, 40 insertions, 38 deletions

diff --git a/drivers/watchdog/sb_wdog.c b/drivers/watchdog/sb_wdog.c
index b94431433695..c8b544ce77fb 100644
--- a/drivers/watchdog/sb_wdog.c
+++ b/drivers/watchdog/sb_wdog.c
@@ -57,6 +57,7 @@
 #include <asm/sibyte/sb1250_int.h>
 #include <asm/sibyte/sb1250_scd.h>
 
+static DEFINE_SPINLOCK(sbwd_lock);
 
 /*
  * set the initial count value of a timer
@@ -65,8 +66,10 @@
  */
 void sbwdog_set(char __iomem *wdog, unsigned long t)
 {
+        spin_lock(&sbwd_lock);
         __raw_writeb(0, wdog - 0x10);
         __raw_writeq(t & 0x7fffffUL, wdog);
+        spin_unlock(&sbwd_lock);
 }
 
 /*
@@ -77,7 +80,9 @@ void sbwdog_set(char __iomem *wdog, unsigned long t)
  */
 void sbwdog_pet(char __iomem *wdog)
 {
+        spin_lock(&sbwd_lock);
         __raw_writeb(__raw_readb(wdog) | 1, wdog);
+        spin_unlock(&sbwd_lock);
 }
 
 static unsigned long sbwdog_gate; /* keeps it to one thread only */
@@ -86,8 +91,9 @@ static char __iomem *user_dog = (char __iomem *)(IO_BASE + (A_SCD_WDOG_CFG_1));
 static unsigned long timeout = 0x7fffffUL;      /* useconds: 8.3ish secs. */
 static int expect_close;
 
-static struct watchdog_info ident = {
-        .options        = WDIOF_CARDRESET | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+static const struct watchdog_info ident = {
+        .options        = WDIOF_CARDRESET | WDIOF_SETTIMEOUT |
+                                                WDIOF_KEEPALIVEPING,
         .identity       = "SiByte Watchdog",
 };
 
@@ -97,9 +103,8 @@ static struct watchdog_info ident = {
 static int sbwdog_open(struct inode *inode, struct file *file)
 {
         nonseekable_open(inode, file);
-        if (test_and_set_bit(0, &sbwdog_gate)) {
+        if (test_and_set_bit(0, &sbwdog_gate))
                 return -EBUSY;
-        }
         __module_get(THIS_MODULE);
 
         /*
@@ -120,8 +125,9 @@ static int sbwdog_release(struct inode *inode, struct file *file)
                 __raw_writeb(0, user_dog);
                 module_put(THIS_MODULE);
         } else {
-                printk(KERN_CRIT "%s: Unexpected close, not stopping watchdog!\n",
-                        ident.identity);
+                printk(KERN_CRIT
+                        "%s: Unexpected close, not stopping watchdog!\n",
+                                                ident.identity);
                 sbwdog_pet(user_dog);
         }
         clear_bit(0, &sbwdog_gate);
@@ -147,12 +153,10 @@ static ssize_t sbwdog_write(struct file *file, const char __user *data,
                 for (i = 0; i != len; i++) {
                         char c;
 
-                        if (get_user(c, data + i)) {
+                        if (get_user(c, data + i))
                                 return -EFAULT;
-                        }
-                        if (c == 'V') {
+                        if (c == 'V')
                                 expect_close = 42;
-                        }
                 }
                 sbwdog_pet(user_dog);
         }
@@ -160,8 +164,8 @@ static ssize_t sbwdog_write(struct file *file, const char __user *data,
         return len;
 }
 
-static int sbwdog_ioctl(struct inode *inode, struct file *file,
-                        unsigned int cmd, unsigned long arg)
+static long sbwdog_ioctl(struct file *file, unsigned int cmd,
+                                                unsigned long arg)
 {
         int ret = -ENOTTY;
         unsigned long time;
@@ -180,9 +184,8 @@ static int sbwdog_ioctl(struct inode *inode, struct file *file,
 
         case WDIOC_SETTIMEOUT:
                 ret = get_user(time, p);
-                if (ret) {
+                if (ret)
                         break;
-                }
 
                 time *= 1000000;
                 if (time > 0x7fffffUL) {
@@ -226,18 +229,16 @@ sbwdog_notify_sys(struct notifier_block *this, unsigned long code, void *erf)
         return NOTIFY_DONE;
 }
 
-static const struct file_operations sbwdog_fops =
-{
+static const struct file_operations sbwdog_fops = {
         .owner          = THIS_MODULE,
         .llseek         = no_llseek,
         .write          = sbwdog_write,
-        .ioctl          = sbwdog_ioctl,
+        .unlocked_ioctl = sbwdog_ioctl,
         .open           = sbwdog_open,
         .release        = sbwdog_release,
 };
 
-static struct miscdevice sbwdog_miscdev =
-{
+static struct miscdevice sbwdog_miscdev = {
         .minor          = WATCHDOG_MINOR,
         .name           = "watchdog",
         .fops           = &sbwdog_fops,
@@ -267,13 +268,12 @@ irqreturn_t sbwdog_interrupt(int irq, void *addr)
         /*
          * if it's the second watchdog timer, it's for those users
          */
-        if (wd_cfg_reg == user_dog) {
+        if (wd_cfg_reg == user_dog)
                 printk(KERN_CRIT
                         "%s in danger of initiating system reset in %ld.%01ld seconds\n",
                         ident.identity, wd_init / 1000000, (wd_init / 100000) % 10);
-        } else {
+        else
                 cfg |= 1;
-        }
 
         __raw_writeb(cfg, wd_cfg_reg);
 
@@ -289,28 +289,31 @@ static int __init sbwdog_init(void)
          */
         ret = register_reboot_notifier(&sbwdog_notifier);
         if (ret) {
-                printk (KERN_ERR "%s: cannot register reboot notifier (err=%d)\n",
-                        ident.identity, ret);
+                printk(KERN_ERR
+                        "%s: cannot register reboot notifier (err=%d)\n",
+                                                ident.identity, ret);
                 return ret;
         }
 
         /*
          * get the resources
          */
-        ret = misc_register(&sbwdog_miscdev);
-        if (ret == 0) {
-                printk(KERN_INFO "%s: timeout is %ld.%ld secs\n", ident.identity,
-                        timeout / 1000000, (timeout / 100000) % 10);
-        }
 
         ret = request_irq(1, sbwdog_interrupt, IRQF_DISABLED | IRQF_SHARED,
                 ident.identity, (void *)user_dog);
         if (ret) {
-                printk(KERN_ERR "%s: failed to request irq 1 - %d\n", ident.identity,
-                        ret);
-                misc_deregister(&sbwdog_miscdev);
+                printk(KERN_ERR "%s: failed to request irq 1 - %d\n",
+                                                ident.identity, ret);
+                return ret;
         }
 
+        ret = misc_register(&sbwdog_miscdev);
+        if (ret == 0) {
+                printk(KERN_INFO "%s: timeout is %ld.%ld secs\n",
+                                ident.identity,
+                                timeout / 1000000, (timeout / 100000) % 10);
+        } else
+                free_irq(1, (void *)user_dog);
         return ret;
 }
 
@@ -327,7 +330,7 @@ MODULE_DESCRIPTION("SiByte Watchdog");
 
 module_param(timeout, ulong, 0);
 MODULE_PARM_DESC(timeout,
-        "Watchdog timeout in microseconds (max/default 8388607 or 8.3ish secs)");
+      "Watchdog timeout in microseconds (max/default 8388607 or 8.3ish secs)");
 
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
@@ -336,16 +339,15 @@ MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
  * example code that can be put in a platform code area to utilize the
  * first watchdog timer for the kernels own purpose.
 
- void
-platform_wd_setup(void)
+void platform_wd_setup(void)
 {
         int ret;
 
-        ret = request_irq(0, sbwdog_interrupt, IRQF_DISABLED | IRQF_SHARED,
+        ret = request_irq(1, sbwdog_interrupt, IRQF_DISABLED | IRQF_SHARED,
                 "Kernel Watchdog", IOADDR(A_SCD_WDOG_CFG_0));
         if (ret) {
-                printk(KERN_CRIT "Watchdog IRQ zero(0) failed to be requested - %d\n",
-                        ret);
+                printk(KERN_CRIT
+                  "Watchdog IRQ zero(0) failed to be requested - %d\n", ret);
         }
 }