[WATCHDOG 26/57] mpc watchdog: clean up and locking

Review and switch to unlocked_ioctl

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

3 files changed, 41 insertions, 35 deletions

diff --git a/drivers/watchdog/mpc5200_wdt.c b/drivers/watchdog/mpc5200_wdt.c
index 80a91d4cea11..ce1811d5d6b1 100644
--- a/drivers/watchdog/mpc5200_wdt.c
+++ b/drivers/watchdog/mpc5200_wdt.c
@@ -4,8 +4,8 @@
 #include <linux/watchdog.h>
 #include <linux/io.h>
 #include <linux/spinlock.h>
-#include <asm/of_platform.h>
-#include <asm/uaccess.h>
+#include <linux/of_platform.h>
+#include <linux/uaccess.h>
 #include <asm/mpc52xx.h>
 
 
@@ -57,7 +57,8 @@ static int mpc5200_wdt_start(struct mpc5200_wdt *wdt)
         /* set timeout, with maximum prescaler */
         out_be32(&wdt->regs->count, 0x0 | wdt->count);
         /* enable watchdog */
-        out_be32(&wdt->regs->mode, GPT_MODE_CE | GPT_MODE_WDT | GPT_MODE_MS_TIMER);
+        out_be32(&wdt->regs->mode, GPT_MODE_CE | GPT_MODE_WDT |
+                                                GPT_MODE_MS_TIMER);
         spin_unlock(&wdt->io_lock);
 
         return 0;
@@ -66,7 +67,8 @@ static int mpc5200_wdt_ping(struct mpc5200_wdt *wdt)
 {
         spin_lock(&wdt->io_lock);
         /* writing A5 to OCPW resets the watchdog */
-        out_be32(&wdt->regs->mode, 0xA5000000 | (0xffffff & in_be32(&wdt->regs->mode)));
+        out_be32(&wdt->regs->mode, 0xA5000000 |
+                                (0xffffff & in_be32(&wdt->regs->mode)));
         spin_unlock(&wdt->io_lock);
         return 0;
 }
@@ -92,8 +94,8 @@ static struct watchdog_info mpc5200_wdt_info = {
         .options        = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
         .identity       = "mpc5200 watchdog on GPT0",
 };
-static int mpc5200_wdt_ioctl(struct inode *inode, struct file *file,
-                unsigned int cmd, unsigned long arg)
+static long mpc5200_wdt_ioctl(struct file *file, unsigned int cmd,
+                                                        unsigned long arg)
 {
         struct mpc5200_wdt *wdt = file->private_data;
         int __user *data = (int __user *)arg;
@@ -103,7 +105,7 @@ static int mpc5200_wdt_ioctl(struct inode *inode, struct file *file,
         switch (cmd) {
         case WDIOC_GETSUPPORT:
                 ret = copy_to_user(data, &mpc5200_wdt_info,
-                        sizeof(mpc5200_wdt_info));
+                                                sizeof(mpc5200_wdt_info));
                 if (ret)
                         ret = -EFAULT;
                 break;
@@ -135,6 +137,7 @@ static int mpc5200_wdt_ioctl(struct inode *inode, struct file *file,
         }
         return ret;
 }
+
 static int mpc5200_wdt_open(struct inode *inode, struct file *file)
 {
         /* /dev/watchdog can only be opened once */
@@ -167,7 +170,8 @@ static const struct file_operations mpc5200_wdt_fops = {
 };
 
 /* module operations */
-static int mpc5200_wdt_probe(struct of_device *op, const struct of_device_id *match)
+static int mpc5200_wdt_probe(struct of_device *op,
+                                        const struct of_device_id *match)
 {
         struct mpc5200_wdt *wdt;
         int err;
diff --git a/drivers/watchdog/mpc83xx_wdt.c b/drivers/watchdog/mpc83xx_wdt.c
index b16c5cd972eb..109eea0df2d0 100644
--- a/drivers/watchdog/mpc83xx_wdt.c
+++ b/drivers/watchdog/mpc83xx_wdt.c
@@ -22,8 +22,8 @@
 #include <linux/platform_device.h>
 #include <linux/module.h>
 #include <linux/watchdog.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
 
 struct mpc83xx_wdt {
         __be32 res0;
@@ -42,11 +42,13 @@ static struct mpc83xx_wdt __iomem *wd_base;
 
 static u16 timeout = 0xffff;
 module_param(timeout, ushort, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in ticks. (0<timeout<65536, default=65535");
+MODULE_PARM_DESC(timeout,
+        "Watchdog timeout in ticks. (0<timeout<65536, default=65535");
 
 static int reset = 1;
 module_param(reset, bool, 0);
-MODULE_PARM_DESC(reset, "Watchdog Interrupt/Reset Mode. 0 = interrupt, 1 = reset");
+MODULE_PARM_DESC(reset,
+        "Watchdog Interrupt/Reset Mode. 0 = interrupt, 1 = reset");
 
 /*
  * We always prescale, but if someone really doesn't want to they can set this
@@ -105,8 +107,8 @@ static int mpc83xx_wdt_release(struct inode *inode, struct file *file)
         return 0;
 }
 
-static int mpc83xx_wdt_ioctl(struct inode *inode, struct file *file,
-                                unsigned int cmd, unsigned long arg)
+static long mpc83xx_wdt_ioctl(struct file *file, unsigned int cmd,
+                                                        unsigned long arg)
 {
         void __user *argp = (void __user *)arg;
         int __user *p = argp;
@@ -136,7 +138,7 @@ static const struct file_operations mpc83xx_wdt_fops = {
         .owner          = THIS_MODULE,
         .llseek         = no_llseek,
         .write          = mpc83xx_wdt_write,
-        .ioctl          = mpc83xx_wdt_ioctl,
+        .unlocked_ioctl = mpc83xx_wdt_ioctl,
         .open           = mpc83xx_wdt_open,
         .release        = mpc83xx_wdt_release,
 };
@@ -161,8 +163,7 @@ static int __devinit mpc83xx_wdt_probe(struct platform_device *dev)
                 goto err_out;
         }
 
-        wd_base = ioremap(r->start, sizeof (struct mpc83xx_wdt));
-
+        wd_base = ioremap(r->start, sizeof(struct mpc83xx_wdt));
         if (wd_base == NULL) {
                 ret = -ENOMEM;
                 goto err_out;
diff --git a/drivers/watchdog/mpc8xx_wdt.c b/drivers/watchdog/mpc8xx_wdt.c
index 85b5734403a5..1336425acf20 100644
--- a/drivers/watchdog/mpc8xx_wdt.c
+++ b/drivers/watchdog/mpc8xx_wdt.c
@@ -16,36 +16,35 @@
 #include <linux/module.h>
 #include <linux/watchdog.h>
 #include <asm/8xx_immap.h>
-#include <asm/uaccess.h>
-#include <asm/io.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
 #include <syslib/m8xx_wdt.h>
 
 static unsigned long wdt_opened;
 static int wdt_status;
+static spinlock_t wdt_lock;
 
 static void mpc8xx_wdt_handler_disable(void)
 {
         volatile uint __iomem *piscr;
-        piscr = (uint *)&((immap_t*)IMAP_ADDR)->im_sit.sit_piscr;
+        piscr = (uint *)&((immap_t *)IMAP_ADDR)->im_sit.sit_piscr;
 
         if (!m8xx_has_internal_rtc)
                 m8xx_wdt_stop_timer();
         else
                 out_be32(piscr, in_be32(piscr) & ~(PISCR_PIE | PISCR_PTE));
-
         printk(KERN_NOTICE "mpc8xx_wdt: keep-alive handler deactivated\n");
 }
 
 static void mpc8xx_wdt_handler_enable(void)
 {
         volatile uint __iomem *piscr;
-        piscr = (uint *)&((immap_t*)IMAP_ADDR)->im_sit.sit_piscr;
+        piscr = (uint *)&((immap_t *)IMAP_ADDR)->im_sit.sit_piscr;
 
         if (!m8xx_has_internal_rtc)
                 m8xx_wdt_install_timer();
         else
                 out_be32(piscr, in_be32(piscr) | PISCR_PIE | PISCR_PTE);
-
         printk(KERN_NOTICE "mpc8xx_wdt: keep-alive handler activated\n");
 }
 
@@ -53,37 +52,34 @@ static int mpc8xx_wdt_open(struct inode *inode, struct file *file)
 {
         if (test_and_set_bit(0, &wdt_opened))
                 return -EBUSY;
-
         m8xx_wdt_reset();
         mpc8xx_wdt_handler_disable();
-
         return nonseekable_open(inode, file);
 }
 
 static int mpc8xx_wdt_release(struct inode *inode, struct file *file)
 {
         m8xx_wdt_reset();
-
 #if !defined(CONFIG_WATCHDOG_NOWAYOUT)
         mpc8xx_wdt_handler_enable();
 #endif
-
         clear_bit(0, &wdt_opened);
-
         return 0;
 }
 
-static ssize_t mpc8xx_wdt_write(struct file *file, const char *data, size_t len,
-                                loff_t * ppos)
+static ssize_t mpc8xx_wdt_write(struct file *file, const char *data,
+                                                size_t len, loff_t *ppos)
 {
-        if (len)
+        if (len) {
+                spin_lock(&wdt_lock);
                 m8xx_wdt_reset();
-
+                spin_unlock(&wdt_lock);
+        }
         return len;
 }
 
-static int mpc8xx_wdt_ioctl(struct inode *inode, struct file *file,
-                            unsigned int cmd, unsigned long arg)
+static long mpc8xx_wdt_ioctl(struct file *file,
+                                        unsigned int cmd, unsigned long arg)
 {
         int timeout;
         static struct watchdog_info info = {
@@ -112,15 +108,19 @@ static int mpc8xx_wdt_ioctl(struct inode *inode, struct file *file,
                 return -EOPNOTSUPP;
 
         case WDIOC_KEEPALIVE:
+                spin_lock(&wdt_lock);
                 m8xx_wdt_reset();
                 wdt_status |= WDIOF_KEEPALIVEPING;
+                spin_unlock(&wdt_lock);
                 break;
 
         case WDIOC_SETTIMEOUT:
                 return -EOPNOTSUPP;
 
         case WDIOC_GETTIMEOUT:
+                spin_lock(&wdt_lock);
                 timeout = m8xx_wdt_get_timeout();
+                spin_unlock(&wdt_lock);
                 if (put_user(timeout, (int *)arg))
                         return -EFAULT;
                 break;
@@ -136,7 +136,7 @@ static const struct file_operations mpc8xx_wdt_fops = {
         .owner = THIS_MODULE,
         .llseek = no_llseek,
         .write = mpc8xx_wdt_write,
-        .ioctl = mpc8xx_wdt_ioctl,
+        .unlocked_ioctl = mpc8xx_wdt_ioctl,
         .open = mpc8xx_wdt_open,
         .release = mpc8xx_wdt_release,
 };
@@ -149,6 +149,7 @@ static struct miscdevice mpc8xx_wdt_miscdev = {
 
 static int __init mpc8xx_wdt_init(void)
 {
+        spin_lock_init(&wdt_lock);
         return misc_register(&mpc8xx_wdt_miscdev);
 }