commit c9dda98be82b88f7741aa0faaeb3a60f753cf9c4
author Linux Build Service Account <lnxbuild@localhost> Fri Jan 06 01:24:40 2023 -0800
committer Linux Build Service Account <lnxbuild@localhost> Fri Jan 06 01:24:40 2023 -0800
tree 3cd00012391a39895fa262be5e82e7771076cba5
parent 28d756be5769d312d5d7a34795d23911ba6d956f
parent 1543dba93c82e5ade2e8f9875096a778a214b0bb

Merge 1543dba93c82e5ade2e8f9875096a778a214b0bb on remote branch

Change-Id: I0711c4a5d30fc6df3b39e685e1e400dc21fb34ac

hal/Usb.cpp

diff --git a/hal/Usb.cpp b/hal/Usb.cpp
index 1cf2a5a..083ad73 100644
--- a/hal/Usb.cpp
+++ b/hal/Usb.cpp
@@ -1064,9 +1064,16 @@
 static bool checkUsbInterfaceAutoSuspend(const std::string& devicePath,
         const std::string &intf) {
   std::string bInterfaceClass;
-  int interfaceClass, ret = -1;
+  int interfaceClass, ret = -1, retry = 3;
 
-  readFile(devicePath + "/" + intf + "/bInterfaceClass", &bInterfaceClass);
+  do {
+	  readFile(devicePath + "/" + intf + "/bInterfaceClass",
+			  &bInterfaceClass);
+  } while ((--retry > 0) && (bInterfaceClass.length() == 0));
+
+  if (bInterfaceClass.length() == 0) {
+	  return false;
+  }
   interfaceClass = std::stoi(bInterfaceClass, 0, 16);
 
   // allow autosuspend for certain class devices