Only monitor recognized uevent devices.

system_server can potentially monitor uevent devices that are
of no use to it. For instance, an accelerometer implementation
as uevents. This would cause the process to be busy when
unnecessary. If a device cannot be classified, don't monitor it.

Change-Id: Ib2c93105e7d746d9c1a7414bea8bab3fb8c0b70a

1 files changed, 8 insertions, 1 deletions

diff --git a/libs/ui/EventHub.cpp b/libs/ui/EventHub.cpp
index a3c34d0ba742..891661d690ac 100644
--- a/libs/ui/EventHub.cpp
+++ b/libs/ui/EventHub.cpp
@@ -581,7 +581,6 @@ int EventHub::open_device(const char *deviceName)
         if (strcmp(name, test) == 0) {
             LOGI("ignoring event id %s driver %s\n", deviceName, test);
             close(fd);
-            fd = -1;
             return -1;
         }
     }
@@ -813,6 +812,14 @@ int EventHub::open_device(const char *deviceName)
                 device->id, name, propName, keylayoutFilename);
     }
 
+    // If the device isn't recognized as something we handle, don't monitor it.
+    if (device->classes == 0) {
+        LOGV("Dropping device %s %p, id = %d\n", deviceName, device, devid);
+        close(fd);
+        delete device;
+        return -1;
+    }
+
     LOGI("New device: path=%s name=%s id=0x%x (of 0x%x) index=%d fd=%d classes=0x%x\n",
          deviceName, name, device->id, mNumDevicesById, mFDCount, fd, device->classes);