From ab9d441425559aa035ba6327f21e8922e8a13927 Mon Sep 17 00:00:00 2001 From: Wim Van Sebroeck Date: Sat, 2 Sep 2006 18:50:20 +0200 Subject: [PATCH] [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 --- drivers/char/watchdog/w83627hf_wdt.c | 8 ++++++++ drivers/char/watchdog/w83697hf_wdt.c | 8 ++++++++ 2 files changed, 16 insertions(+) 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 #include #include +#include #include #include @@ -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)) { diff --git a/drivers/char/watchdog/w83697hf_wdt.c b/drivers/char/watchdog/w83697hf_wdt.c index ef6612e1b91f..21e822e0eeec 100644 --- a/drivers/char/watchdog/w83697hf_wdt.c +++ b/drivers/char/watchdog/w83697hf_wdt.c @@ -33,6 +33,7 @@ #include #include #include +#include #include #include @@ -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; @@ -114,12 +116,16 @@ w83697hf_init(void) static void wdt_ctrl(int timeout) { + spin_lock(&io_lock); + w83697hf_select_wd_register(); outb_p(0xF4, WDT_EFER); /* Select CRF4 */ outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF4 */ w83697hf_unselect_wd_register(); + + spin_unlock(&io_lock); } static int @@ -307,6 +313,8 @@ wdt_init(void) { int ret; + spin_lock_init(&io_lock); + printk(KERN_INFO "WDT driver for the Winbond(TM) W83697HF Super I/O chip initialising.\n"); if (wdt_set_heartbeat(timeout)) { -- 2.20.1