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| author | Wim Van Sebroeck <wim@iguana.be> | 2008-10-02 11:32:45 +0200 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2008-10-10 15:17:43 +0200 |
| commit | 6d0f0dfdbc8bdb0c52759224b0d423c35f828397 (patch) | |
| tree | 878f982d59c70af592fef43f1fbddcafba134254 /drivers/watchdog | |
| parent | [WATCHDOG] Orion: add hardware watchdog support (diff) | |
| download | linux-6d0f0dfdbc8bdb0c52759224b0d423c35f828397.tar.xz linux-6d0f0dfdbc8bdb0c52759224b0d423c35f828397.zip | |
[WATCHDOG] orion5x_wdt.c: add spinlocking
Add spin_locking to orion5x_wdt.c to prevent races.
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/orion5x_wdt.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/drivers/watchdog/orion5x_wdt.c b/drivers/watchdog/orion5x_wdt.c index 144776314989..14a339f58b6a 100644 --- a/drivers/watchdog/orion5x_wdt.c +++ b/drivers/watchdog/orion5x_wdt.c @@ -20,6 +20,7 @@ #include <linux/init.h> #include <linux/uaccess.h> #include <linux/io.h> +#include <linux/spinlock.h> /* * Watchdog timer block registers. @@ -35,11 +36,14 @@ static int nowayout = WATCHDOG_NOWAYOUT; static int heartbeat = WDT_MAX_DURATION; /* (seconds) */ static unsigned long wdt_status; +static spinlock_t wdt_lock; static void wdt_enable(void) { u32 reg; + spin_lock(&wdt_lock); + /* Set watchdog duration */ writel(ORION5X_TCLK * heartbeat, WDT_VAL); @@ -57,12 +61,16 @@ static void wdt_enable(void) reg = readl(CPU_RESET_MASK); reg |= WDT_RESET; writel(reg, CPU_RESET_MASK); + + spin_unlock(&wdt_lock); } static void wdt_disable(void) { u32 reg; + spin_lock(&wdt_lock); + /* Disable reset on watchdog */ reg = readl(CPU_RESET_MASK); reg &= ~WDT_RESET; @@ -72,6 +80,16 @@ static void wdt_disable(void) reg = readl(TIMER_CTRL); reg &= ~WDT_EN; writel(reg, TIMER_CTRL); + + spin_unlock(&wdt_lock); +} + +static int orion5x_wdt_get_timeleft(int *time_left) +{ + spin_lock(&wdt_lock); + *time_left = readl(WDT_VAL) / ORION5X_TCLK; + spin_unlock(&wdt_lock); + return 0; } static int orion5x_wdt_open(struct inode *inode, struct file *file) @@ -83,12 +101,6 @@ static int orion5x_wdt_open(struct inode *inode, struct file *file) return nonseekable_open(inode, file); } -static int orion5x_wdt_get_timeleft(int *time_left) -{ - *time_left = readl(WDT_VAL) / ORION5X_TCLK; - return 0; -} - static ssize_t orion5x_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) { @@ -201,6 +213,8 @@ static int __init orion5x_wdt_init(void) { int ret; + spin_lock_init(&wdt_lock); + ret = misc_register(&orion5x_wdt_miscdev); if (ret == 0) printk("Orion5x Watchdog Timer: heartbeat %d sec\n", |