From e7dade153caf14574ac14ccd2c1fd2257a712b2c Mon Sep 17 00:00:00 2001
From: liulvping <liulvping@xiaomi.com>
Date: Wed, 6 Nov 2019 15:12:20 +0800
Subject: BugFix: add synchronized protection

Test: manual

Change-Id: I1e8b4756e435c13cead2b21619a0c72a399117f7
Signed-off-by: liulvping <liulvping@xiaomi.com>
---
 .../core/java/com/android/server/AppStateTracker.java  | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/services/core/java/com/android/server/AppStateTracker.java b/services/core/java/com/android/server/AppStateTracker.java
index 3a7b5d683507..207e007cc62f 100644
--- a/services/core/java/com/android/server/AppStateTracker.java
+++ b/services/core/java/com/android/server/AppStateTracker.java
@@ -700,14 +700,16 @@ public class AppStateTracker {
                 Slog.d(TAG,"onAppIdleStateChanged: " + packageName + " u" + userId
                         + (idle ? " idle" : " active") + " " + bucket);
             }
-            final boolean changed;
-            if (bucket == UsageStatsManager.STANDBY_BUCKET_EXEMPTED) {
-                changed = mExemptedPackages.add(userId, packageName);
-            } else {
-                changed = mExemptedPackages.remove(userId, packageName);
-            }
-            if (changed) {
-                mHandler.notifyExemptChanged();
+            synchronized (mLock) {
+                final boolean changed;
+                if (bucket == UsageStatsManager.STANDBY_BUCKET_EXEMPTED) {
+                    changed = mExemptedPackages.add(userId, packageName);
+                } else {
+                    changed = mExemptedPackages.remove(userId, packageName);
+                }
+                if (changed) {
+                    mHandler.notifyExemptChanged();
+                }
             }
         }
 
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