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| author | Wim Van Sebroeck <wim@iguana.be> | 2006-09-02 18:50:20 +0200 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2006-10-04 22:41:48 +0200 |
| commit | ab9d441425559aa035ba6327f21e8922e8a13927 (patch) | |
| tree | e1deeab38550be809d50e804a669dbd8ff2992f5 /drivers/char/watchdog/w83627hf_wdt.c | |
| parent | e0845bf4e1df07e16fa39d96508a1ba4a480ce3e (diff) | |
| download | lwn-ab9d441425559aa035ba6327f21e8922e8a13927.tar.gz lwn-ab9d441425559aa035ba6327f21e8922e8a13927.zip | |
[WATCHDOG] w836?7hf_wdt spinlock fixes.
Add io spinlocks to prevent possible race
conditions between start and stop operations
that are issued from different child processes
where the master process opened /dev/watchdog.
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/char/watchdog/w83627hf_wdt.c')
| -rw-r--r-- | drivers/char/watchdog/w83627hf_wdt.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/char/watchdog/w83627hf_wdt.c b/drivers/char/watchdog/w83627hf_wdt.c index b4adc527e687..07d4bff27226 100644 --- a/drivers/char/watchdog/w83627hf_wdt.c +++ b/drivers/char/watchdog/w83627hf_wdt.c @@ -33,6 +33,7 @@ #include <linux/notifier.h> #include <linux/reboot.h> #include <linux/init.h> +#include <linux/spinlock.h> #include <asm/io.h> #include <asm/uaccess.h> @@ -44,6 +45,7 @@ static unsigned long wdt_is_open; static char expect_close; +static spinlock_t io_lock; /* You must set this - there is no sane way to probe for this board. */ static int wdt_io = 0x2E; @@ -110,12 +112,16 @@ w83627hf_init(void) static void wdt_ctrl(int timeout) { + spin_lock(&io_lock); + w83627hf_select_wd_register(); outb_p(0xF6, WDT_EFER); /* Select CRF6 */ outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF6 */ w83627hf_unselect_wd_register(); + + spin_unlock(&io_lock); } static int @@ -303,6 +309,8 @@ wdt_init(void) { int ret; + spin_lock_init(&io_lock); + printk(KERN_INFO "WDT driver for the Winbond(TM) W83627HF Super I/O chip initialising.\n"); if (wdt_set_heartbeat(timeout)) { |