Commit 6fd65601 authored by Samuel Tardieu's avatar Samuel Tardieu Committed by Wim Van Sebroeck

[WATCHDOG] Add w83697h_wdt early_disable option

Pádraig Brady requested the possibility of not disabling the watchdog
at module load time or kernel boot time if it had been previously enabled
in the bios. It may help rebooting the machine if it freezes before the
userland daemon kicks in.
Signed-off-by: default avatarSamuel Tardieu <sam@rfc1149.net>
Cc: Pádraig Brady <P@draigBrady.com>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 5794a9f4
......@@ -44,6 +44,7 @@
#define WATCHDOG_NAME "w83697hf/hg WDT"
#define PFX WATCHDOG_NAME ": "
#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
#define WATCHDOG_EARLY_DISABLE 1 /* Disable until userland kicks in */
static unsigned long wdt_is_open;
static char expect_close;
......@@ -62,6 +63,10 @@ static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
static int early_disable = WATCHDOG_EARLY_DISABLE;
module_param(early_disable, int, 0);
MODULE_PARM_DESC(early_disable, "Watchdog gets disabled at boot time (default=" __MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")");
/*
* Kernel methods.
*/
......@@ -178,6 +183,22 @@ wdt_disable(void)
spin_unlock(&io_lock);
}
static unsigned char
wdt_running(void)
{
unsigned char t;
spin_lock(&io_lock);
w83697hf_select_wdt();
t = w83697hf_get_reg(0xF4); /* Read timer */
w83697hf_deselect_wdt();
spin_unlock(&io_lock);
return t;
}
static int
wdt_set_heartbeat(int t)
{
......@@ -394,7 +415,11 @@ wdt_init(void)
}
w83697hf_init();
wdt_disable(); /* Disable watchdog until first use */
if (early_disable) {
if (wdt_running())
printk (KERN_WARNING PFX "Stopping previously enabled watchdog until userland kicks in\n");
wdt_disable();
}
if (wdt_set_heartbeat(timeout)) {
wdt_set_heartbeat(WATCHDOG_TIMEOUT);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment