[PATCH v2 1/3] PM: hibernate: Fix hybrid-sleep

["Mario Limonciello (AMD)" <superm1@kernel.org>]

Hybrid sleep will hibernate the system followed by running through
the suspend routine.  Since both the hibernate and the suspend routine
will call pm_restrict_gfp_mask(), pm_restore_gfp_mask() must be called
before starting the suspend sequence.

Add an explicit call to pm_restore_gfp_mask() to power_down() before
the suspend sequence starts. Don't call pm_restore_gfp_mask() when
exiting suspend sequence it is already called:

```
power_down()
->suspend_devices_and_enter()
-->dpm_resume_end()
```

Reported-by: Ionut Nechita <ionut_n2001@yahoo.com>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4573
Tested-by: Ionut Nechita <ionut_n2001@yahoo.com>
Fixes: 12ffc3b1513eb ("PM: Restrict swap use to later in the suspend sequence")
Tested-by: Kenneth Crudup <kenny@panix.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
---
v2:
 * Move under CONFIG_SUSPEND scope (LKP robot)
 * Add tags
---
 kernel/power/hibernate.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 2f66ab4538231..52c1818749724 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -695,6 +695,7 @@ static void power_down(void)
 
 #ifdef CONFIG_SUSPEND
 	if (hibernation_mode == HIBERNATION_SUSPEND) {
+		pm_restore_gfp_mask();
 		error = suspend_devices_and_enter(mem_sleep_current);
 		if (error) {
 			hibernation_mode = hibernation_ops ?
@@ -862,7 +863,15 @@ int hibernate(void)
 				power_down();
 		}
 		in_suspend = 0;
-		pm_restore_gfp_mask();
+		switch (hibernation_mode) {
+#ifdef CONFIG_SUSPEND
+		case HIBERNATION_SUSPEND:
+			break;
+#endif
+		default:
+			pm_restore_gfp_mask();
+			break;
+		}
 	} else {
 		pm_pr_dbg("Hibernation image restored successfully.\n");
 	}
-- 
2.43.0