[PATCH] PM: suspend: Fix platform_suspend_prepare_noirq()

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wyso...@intel.com>

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.szyprow...@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
---

Commit ac9eafbe930a is in linux-next only at this point.

---
 kernel/power/suspend.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

Index: linux-pm/kernel/power/suspend.c
===================================================================
--- linux-pm.orig/kernel/power/suspend.c
+++ linux-pm/kernel/power/suspend.c
@@ -253,10 +253,10 @@ 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;
 }
 
@@ -265,8 +265,9 @@ 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)