[Xen-devel] [PATCH] x86/suspend: disable watchdog before calling console_start_sync()

[Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>]

... and enable it after exiting S-state. Otherwise accumulated
output in serial buffer might easily trigger the watchdog if it's
still enabled after entering sync transmission mode.

The issue observed on machines which, unfortunately, generate non-0
output in CPU offline callbacks.

Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
---
 xen/arch/x86/acpi/power.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/x86/acpi/power.c b/xen/arch/x86/acpi/power.c
index 8078352..62384a4 100644
--- a/xen/arch/x86/acpi/power.c
+++ b/xen/arch/x86/acpi/power.c
@@ -23,6 +23,7 @@
 #include <xen/domain.h>
 #include <xen/console.h>
 #include <xen/iommu.h>
+#include <xen/watchdog.h>
 #include <xen/cpu.h>
 #include <public/platform.h>
 #include <asm/tboot.h>
@@ -223,6 +224,7 @@ static int enter_state(u32 state)
 
     acpi_sleep_prepare(state);
 
+    watchdog_disable();
     console_start_sync();
     printk("Entering ACPI S%d state.\n", state);
 
@@ -281,6 +283,7 @@ static int enter_state(u32 state)
         tboot_s3_error(error);
 
     console_end_sync();
+    watchdog_enable();
 
     microcode_update_one(true);
 
-- 
2.7.4


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