diff options
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/shwdt.c | 34 |
1 files changed, 19 insertions, 15 deletions
diff --git a/drivers/watchdog/shwdt.c b/drivers/watchdog/shwdt.c index 0beabf238d4..0d734a38d29 100644 --- a/drivers/watchdog/shwdt.c +++ b/drivers/watchdog/shwdt.c @@ -25,6 +25,7 @@ #include <linux/platform_device.h> #include <linux/init.h> #include <linux/types.h> +#include <linux/spinlock.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/fs.h> @@ -65,8 +66,6 @@ static int clock_division_ratio = WTCSR_CKS_4096; #define next_ping_period(cks) (jiffies + msecs_to_jiffies(cks - 4)) -static DEFINE_SPINLOCK(shwdt_lock); - #define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat */ static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */ static bool nowayout = WATCHDOG_NOWAYOUT; @@ -75,6 +74,7 @@ static unsigned long next_heartbeat; struct sh_wdt { void __iomem *base; struct device *dev; + spinlock_t lock; struct timer_list timer; @@ -88,7 +88,7 @@ static int sh_wdt_start(struct watchdog_device *wdt_dev) unsigned long flags; u8 csr; - spin_lock_irqsave(&shwdt_lock, flags); + spin_lock_irqsave(&wdt->lock, flags); next_heartbeat = jiffies + (heartbeat * HZ); mod_timer(&wdt->timer, next_ping_period(clock_division_ratio)); @@ -117,7 +117,7 @@ static int sh_wdt_start(struct watchdog_device *wdt_dev) csr &= ~RSTCSR_RSTS; sh_wdt_write_rstcsr(csr); #endif - spin_unlock_irqrestore(&shwdt_lock, flags); + spin_unlock_irqrestore(&wdt->lock, flags); return 0; } @@ -128,7 +128,7 @@ static int sh_wdt_stop(struct watchdog_device *wdt_dev) unsigned long flags; u8 csr; - spin_lock_irqsave(&shwdt_lock, flags); + spin_lock_irqsave(&wdt->lock, flags); del_timer(&wdt->timer); @@ -136,33 +136,35 @@ static int sh_wdt_stop(struct watchdog_device *wdt_dev) csr &= ~WTCSR_TME; sh_wdt_write_csr(csr); - spin_unlock_irqrestore(&shwdt_lock, flags); + spin_unlock_irqrestore(&wdt->lock, flags); return 0; } static int sh_wdt_keepalive(struct watchdog_device *wdt_dev) { + struct sh_wdt *wdt = watchdog_get_drvdata(wdt_dev); unsigned long flags; - spin_lock_irqsave(&shwdt_lock, flags); + spin_lock_irqsave(&wdt->lock, flags); next_heartbeat = jiffies + (heartbeat * HZ); - spin_unlock_irqrestore(&shwdt_lock, flags); + spin_unlock_irqrestore(&wdt->lock, flags); return 0; } static int sh_wdt_set_heartbeat(struct watchdog_device *wdt_dev, unsigned t) { + struct sh_wdt *wdt = watchdog_get_drvdata(wdt_dev); unsigned long flags; if (unlikely(t < 1 || t > 3600)) /* arbitrary upper limit */ return -EINVAL; - spin_lock_irqsave(&shwdt_lock, flags); + spin_lock_irqsave(&wdt->lock, flags); heartbeat = t; wdt_dev->timeout = t; - spin_unlock_irqrestore(&shwdt_lock, flags); + spin_unlock_irqrestore(&wdt->lock, flags); return 0; } @@ -172,7 +174,7 @@ static void sh_wdt_ping(unsigned long data) struct sh_wdt *wdt = (struct sh_wdt *)data; unsigned long flags; - spin_lock_irqsave(&shwdt_lock, flags); + spin_lock_irqsave(&wdt->lock, flags); if (time_before(jiffies, next_heartbeat)) { u8 csr; @@ -186,7 +188,7 @@ static void sh_wdt_ping(unsigned long data) } else dev_warn(wdt->dev, "Heartbeat lost! Will not ping " "the watchdog\n"); - spin_unlock_irqrestore(&shwdt_lock, flags); + spin_unlock_irqrestore(&wdt->lock, flags); } static const struct watchdog_info sh_wdt_info = { @@ -238,12 +240,17 @@ static int __devinit sh_wdt_probe(struct platform_device *pdev) wdt->dev = &pdev->dev; + watchdog_set_nowayout(&sh_wdt_dev, nowayout); + watchdog_set_drvdata(&sh_wdt_dev, wdt); + wdt->base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); if (unlikely(!wdt->base)) { rc = -ENXIO; goto out_err; } + spin_lock_init(&wdt->lock); + rc = sh_wdt_set_heartbeat(&sh_wdt_dev, heartbeat); if (unlikely(rc)) { /* Default timeout if invalid */ @@ -257,9 +264,6 @@ static int __devinit sh_wdt_probe(struct platform_device *pdev) dev_info(&pdev->dev, "configured with heartbeat=%d sec (nowayout=%d)\n", sh_wdt_dev.timeout, nowayout); - watchdog_set_nowayout(&sh_wdt_dev, nowayout); - watchdog_set_drvdata(&sh_wdt_dev, wdt); - rc = watchdog_register_device(&sh_wdt_dev); if (unlikely(rc)) { dev_err(&pdev->dev, "Can't register watchdog (err=%d)\n", rc); |