From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Sat, 10 Aug 2019 13:18:06 +0200
Subject: PM: suspend: Fix platform_suspend_prepare_noirq()
Patch-mainline: v5.4-rc1
Git-commit: 11f26633cccb7243217370837cbb066a73f678a5
References: jsc#SLE-16407

After commit ac9eafbe930a ("ACPI: PM: s2idle: Execute LPS0 _DSM
functions with suspended devices"), a NULL pointer may be dereferenced
if suspend-to-idle is attempted on a platform without "traditional"
suspend support due to invalid fall-through in
platform_suspend_prepare_noirq().

Fix that and while at it add missing braces in platform_resume_noirq().

Fixes: ac9eafbe930a ("ACPI: PM: s2idle: Execute LPS0 _DSM functions with suspended devices")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Lee, Chun-Yi <jlee@suse.com>
---
 kernel/power/suspend.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -264,10 +264,10 @@ static int platform_suspend_prepare_late
 
 static int platform_suspend_prepare_noirq(suspend_state_t state)
 {
-	if (state == PM_SUSPEND_TO_IDLE) {
-		if (s2idle_ops && s2idle_ops->prepare_late)
-			return s2idle_ops->prepare_late();
-	}
+	if (state == PM_SUSPEND_TO_IDLE)
+		return s2idle_ops && s2idle_ops->prepare_late ?
+			s2idle_ops->prepare_late() : 0;
+
 	return suspend_ops->prepare_late ? suspend_ops->prepare_late() : 0;
 }
 
@@ -276,8 +276,9 @@ static void platform_resume_noirq(suspen
 	if (state == PM_SUSPEND_TO_IDLE) {
 		if (s2idle_ops && s2idle_ops->restore_early)
 			s2idle_ops->restore_early();
-	} else if (suspend_ops->wake)
+	} else if (suspend_ops->wake) {
 		suspend_ops->wake();
+	}
 }
 
 static void platform_resume_early(suspend_state_t state)