diff options
Diffstat (limited to 'drivers/watchdog/shwdt.c')
-rw-r--r-- | 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 1277f7e9cc5..60f0036aaca 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); |