diff options
Diffstat (limited to 'drivers/watchdog/sb_wdog.c')
-rw-r--r-- | drivers/watchdog/sb_wdog.c | 78 |
1 files changed, 40 insertions, 38 deletions
diff --git a/drivers/watchdog/sb_wdog.c b/drivers/watchdog/sb_wdog.c index b9443143369..c8b544ce77f 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); } } |