From: Chen Yu <yu.c.chen@xxxxxxxxx>
[ Upstream commit 08169a162f97819d3e5b4a342bb9cf5137787154 ]
There is need to check snapshot_test and open block device
in different mode, so as to avoid the race condition.
No functional changes intended.
Suggested-by: Pavankumar Kondeti <quic_pkondeti@xxxxxxxxxxx>
Signed-off-by: Chen Yu <yu.c.chen@xxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Stable-dep-of: 5904de0d735b ("PM: hibernate: Do not get block device exclusively in test_resume mode")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
kernel/power/hibernate.c | 7 ++++++-
kernel/power/power.h | 1 +
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 793c55a2becba..aa551b093c3f6 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -64,6 +64,7 @@ enum {
static int hibernation_mode = HIBERNATION_SHUTDOWN;
bool freezer_test_done;
+bool snapshot_test;
static const struct platform_hibernation_ops *hibernation_ops;
@@ -716,7 +717,6 @@ static int load_image_and_restore(void)
*/
int hibernate(void)
{
- bool snapshot_test = false;
unsigned int sleep_flags;
int error;
@@ -744,6 +744,9 @@ int hibernate(void)
if (error)
goto Exit;
+ /* protected by system_transition_mutex */
+ snapshot_test = false;
+
lock_device_hotplug();
/* Allocate memory management structures */
error = create_basic_memory_bitmaps();
@@ -940,6 +943,8 @@ static int software_resume(void)
*/
mutex_lock_nested(&system_transition_mutex, SINGLE_DEPTH_NESTING);
+ snapshot_test = false;
+
if (swsusp_resume_device)
goto Check_image;
diff --git a/kernel/power/power.h b/kernel/power/power.h
index b4f4339432096..b83c8d5e188de 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -59,6 +59,7 @@ asmlinkage int swsusp_save(void);
/* kernel/power/hibernate.c */
extern bool freezer_test_done;
+extern bool snapshot_test;
extern int hibernation_snapshot(int platform_mode);
extern int hibernation_restore(int platform_mode);
--
2.39.2
