From 9200a3987e3dc147f732e9bce34ab1c5be043f12 Mon Sep 17 00:00:00 2001
From: Mike Lockwood <lockwood@android.com>
Date: Tue, 17 Nov 2009 20:25:58 -0500
Subject: [PATCH] Handle KeyguardViewMediator.setHidden() asynchronously to
 avoid deadlocks.

Fixes b/2267046 (Could not shut off alarm; then device reboot)

Change-Id: Id8f3e24edc5e1242a39c5d43bd549b5cb05abb36
Signed-off-by: Mike Lockwood <lockwood@android.com>
---
 .../policy/impl/KeyguardViewMediator.java     | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/policy/com/android/internal/policy/impl/KeyguardViewMediator.java b/policy/com/android/internal/policy/impl/KeyguardViewMediator.java
index f5591b213df58..8d60e0ecdd49b 100644
--- a/policy/com/android/internal/policy/impl/KeyguardViewMediator.java
+++ b/policy/com/android/internal/policy/impl/KeyguardViewMediator.java
@@ -105,6 +105,7 @@ public class KeyguardViewMediator implements KeyguardViewCallback,
     private static final int KEYGUARD_DONE = 9;
     private static final int KEYGUARD_DONE_DRAWING = 10;
     private static final int KEYGUARD_DONE_AUTHENTICATING = 11;
+    private static final int SET_HIDDEN = 12;
     
     /**
      * The default amount of time we stay awake (used for all key input)
@@ -425,9 +426,20 @@ public class KeyguardViewMediator implements KeyguardViewCallback,
      */
     public void setHidden(boolean isHidden) {
         if (DEBUG) Log.d(TAG, "setHidden " + isHidden);
+        mHandler.removeMessages(SET_HIDDEN);
+        Message msg = mHandler.obtainMessage(SET_HIDDEN, (isHidden ? 1 : 0), 0);
+        mHandler.sendMessage(msg);
+    }
+
+    /**
+     * Handles SET_HIDDEN message sent by setHidden()
+     */
+    private void handleSetHidden(boolean isHidden) {
         synchronized (KeyguardViewMediator.this) {
-            mHidden = isHidden;
-            adjustUserActivityLocked();
+            if (mHidden != isHidden) {
+                mHidden = isHidden;
+                adjustUserActivityLocked();
+            }
         }
     }
 
@@ -812,6 +824,9 @@ public class KeyguardViewMediator implements KeyguardViewCallback,
                 case KEYGUARD_DONE_AUTHENTICATING:
                     keyguardDone(true);
                     return;
+                case SET_HIDDEN:
+                    handleSetHidden(msg.arg1 != 0);
+                    break;
             }
         }
     };