From: Jean Delvare jdelvare@suse.de
[ Upstream commit 3f9e12e0df012c4a9a7fd7eb0d3ae69b459d6b2c ]
In case the WDAT interface is broken, give the user an option to ignore it to let a native driver bind to the watchdog device instead.
Signed-off-by: Jean Delvare jdelvare@suse.de Acked-by: Mika Westerberg mika.westerberg@linux.intel.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- Documentation/kernel-parameters.txt | 4 ++++ drivers/acpi/acpi_watchdog.c | 12 +++++++++++- 2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index b2d2f4539a3fe..e05d65d6fcb68 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -335,6 +335,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted. dynamic table installation which will install SSDT tables to /sys/firmware/acpi/tables/dynamic.
+ acpi_no_watchdog [HW,ACPI,WDT] + Ignore the ACPI-based watchdog interface (WDAT) and let + a native driver control the watchdog device instead. + acpi_rsdp= [ACPI,EFI,KEXEC] Pass the RSDP address to the kernel, mostly used on machines running EFI runtime service to boot the diff --git a/drivers/acpi/acpi_watchdog.c b/drivers/acpi/acpi_watchdog.c index 7ef0a0e105e18..4296f4932294f 100644 --- a/drivers/acpi/acpi_watchdog.c +++ b/drivers/acpi/acpi_watchdog.c @@ -58,12 +58,14 @@ static bool acpi_watchdog_uses_rtc(const struct acpi_table_wdat *wdat) } #endif
+static bool acpi_no_watchdog; + static const struct acpi_table_wdat *acpi_watchdog_get_wdat(void) { const struct acpi_table_wdat *wdat = NULL; acpi_status status;
- if (acpi_disabled) + if (acpi_disabled || acpi_no_watchdog) return NULL;
status = acpi_get_table(ACPI_SIG_WDAT, 0, @@ -91,6 +93,14 @@ bool acpi_has_watchdog(void) } EXPORT_SYMBOL_GPL(acpi_has_watchdog);
+/* ACPI watchdog can be disabled on boot command line */ +static int __init disable_acpi_watchdog(char *str) +{ + acpi_no_watchdog = true; + return 1; +} +__setup("acpi_no_watchdog", disable_acpi_watchdog); + void __init acpi_watchdog_init(void) { const struct acpi_wdat_entry *entries;