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| author | Wim Van Sebroeck <wim@iguana.be> | 2009-02-23 16:08:36 +0300 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2009-03-25 12:01:50 +0300 |
| commit | e455b6b4ed66be0c2aa6e41fd9027c1ce585a490 (patch) | |
| tree | fcc99995d1ccf7a441e3ca09cbfa9c6f4eca0ec7 | |
| parent | 0aaae66179f269b7b37d0b526029c5783bed1da3 (diff) | |
| download | linux-e455b6b4ed66be0c2aa6e41fd9027c1ce585a490.tar.xz | |
[WATCHDOG] rc32434_wdt: add spin_locking
Add spin_locks to prevent races.
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
| -rw-r--r-- | drivers/watchdog/rc32434_wdt.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/watchdog/rc32434_wdt.c b/drivers/watchdog/rc32434_wdt.c index eee29923a14d..bffd4a2b1151 100644 --- a/drivers/watchdog/rc32434_wdt.c +++ b/drivers/watchdog/rc32434_wdt.c @@ -28,6 +28,7 @@ #include <linux/watchdog.h> /* For the watchdog specific items */ #include <linux/init.h> /* For __init/__exit/... */ #include <linux/platform_device.h> /* For platform_driver framework */ +#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ #include <asm/mach-rc32434/integ.h> /* For the Watchdog registers */ @@ -38,6 +39,7 @@ static struct { unsigned long inuse; + spinlock_t io_lock; } rc32434_wdt_device; static struct integ __iomem *wdt_reg; @@ -81,7 +83,9 @@ static int rc32434_wdt_set(int new_timeout) return -EINVAL; } timeout = new_timeout; + spin_lock(&rc32434_wdt_device.io_lock); writel(SEC2WTCOMP(timeout), &wdt_reg->wtcompare); + spin_unlock(&rc32434_wdt_device.io_lock); return 0; } @@ -90,6 +94,8 @@ static void rc32434_wdt_start(void) { u32 or, nand; + spin_lock(&rc32434_wdt_device.io_lock); + /* zero the counter before enabling */ writel(0, &wdt_reg->wtcount); @@ -112,20 +118,26 @@ static void rc32434_wdt_start(void) SET_BITS(wdt_reg->wtc, or, nand); + spin_unlock(&rc32434_wdt_device.io_lock); printk(KERN_INFO PFX "Started watchdog timer.\n"); } static void rc32434_wdt_stop(void) { + spin_lock(&rc32434_wdt_device.io_lock); + /* Disable WDT */ SET_BITS(wdt_reg->wtc, 0, 1 << RC32434_WTC_EN); + spin_unlock(&rc32434_wdt_device.io_lock); printk(KERN_INFO PFX "Stopped watchdog timer.\n"); } static void rc32434_wdt_ping(void) { + spin_lock(&rc32434_wdt_device.io_lock); writel(0, &wdt_reg->wtcount); + spin_unlock(&rc32434_wdt_device.io_lock); } static int rc32434_wdt_open(struct inode *inode, struct file *file) @@ -270,6 +282,8 @@ static int __devinit rc32434_wdt_probe(struct platform_device *pdev) return -ENXIO; } + spin_lock_init(&rc32434_wdt_device.io_lock); + /* Check that the heartbeat value is within it's range; * if not reset to the default */ if (rc32434_wdt_set(timeout)) { |