From d1d80c29a6bdd37f3befa7f66adf37a4e984056d Mon Sep 17 00:00:00 2001
From: Joe LaPenna <jlapenna@google.com>
Date: Wed, 27 Apr 2016 09:25:15 -0700
Subject: [PATCH] Allow "disk reads" to sysfs in battery stats

BUG: 28406622

Change-Id: I9792bfc1e913c31e4cc386c5633f6a47ce311a7c
---
 core/java/com/android/internal/os/KernelCpuSpeedReader.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/core/java/com/android/internal/os/KernelCpuSpeedReader.java b/core/java/com/android/internal/os/KernelCpuSpeedReader.java
index 3f6ebb9cccff1..9c7debb7d9c99 100644
--- a/core/java/com/android/internal/os/KernelCpuSpeedReader.java
+++ b/core/java/com/android/internal/os/KernelCpuSpeedReader.java
@@ -16,6 +16,7 @@
 package com.android.internal.os;
 
 import android.text.TextUtils;
+import android.os.StrictMode;
 import android.system.OsConstants;
 import android.util.Slog;
 
@@ -62,6 +63,7 @@ public class KernelCpuSpeedReader {
      * {@link #readDelta}.
      */
     public long[] readDelta() {
+        StrictMode.ThreadPolicy policy = StrictMode.allowThreadDiskReads();
         try (BufferedReader reader = new BufferedReader(new FileReader(mProcFile))) {
             TextUtils.SimpleStringSplitter splitter = new TextUtils.SimpleStringSplitter(' ');
             String line;
@@ -84,6 +86,8 @@ public class KernelCpuSpeedReader {
         } catch (IOException e) {
             Slog.e(TAG, "Failed to read cpu-freq: " + e.getMessage());
             Arrays.fill(mDeltaSpeedTimes, 0);
+        } finally {
+            StrictMode.setThreadPolicy(policy);
         }
         return mDeltaSpeedTimes;
     }