[PATCH 45/57] shwdt: coding style, cleanup, switch to unlocked_ioctl

Alan Cox
2008-05-19T13:33:05Z

drivers/watchdog/shwdt.c | 139 +++++++++++++++++++++++++++-------------------
1 files changed, 82 insertions(+), 57 deletions(-)

diff --git a/drivers/watchdog/shwdt.c b/drivers/watchdog/shwdt.c
index 1277f7e..60f0036 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);