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SensorService Flush API bug fix.

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SensorService is dead locking itself when flush is called on older devices which don't support batching. mConnectionLock is acquired twice.

Change-Id: I5c25585bfb2b396df4b05826a9cba1da7997a3ee
This commit is contained in:
Aravind Akella 2013-10-14 17:04:42 -07:00
parent 2d344979eb
commit c551eac5b1
2 changed files with 19 additions and 34 deletions
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50
services/sensorservice/SensorService.cpp
View File

@ -686,21 +686,6 @@ status_t SensorService::flushSensor(const sp<SensorEventConnection>& connection,
ALOGE("flush called on Significant Motion sensor");
return INVALID_OPERATION;
}
SensorDevice& dev(SensorDevice::getInstance());
if (dev.getHalDeviceVersion() < SENSORS_DEVICE_API_VERSION_1_1) {
// For older devices increment pending flush count, which will send a trivial flush complete
// event for all the connections which are registered for updates on this sensor.
const SortedVector< wp<SensorEventConnection> > activeConnections(
getActiveConnections());
for (size_t i=0 ; i<activeConnections.size() ; i++) {
sp<SensorEventConnection> connection(activeConnections[i].promote());
if (connection != 0) {
connection->incrementPendingFlushCount(handle);
}
}
return NO_ERROR;
}
return sensor->flush(connection.get(), handle);
}
// ---------------------------------------------------------------------------
@ -805,15 +790,6 @@ void SensorService::SensorEventConnection::setFirstFlushPending(int32_t handle,
}
}
void SensorService::SensorEventConnection::incrementPendingFlushCount(int32_t handle) {
Mutex::Autolock _l(mConnectionLock);
ssize_t index = mSensorInfo.indexOfKey(handle);
if (index >= 0) {
FlushInfo& flushInfo = mSensorInfo.editValueAt(index);
flushInfo.mPendingFlushEventsToSend++;
}
}
status_t SensorService::SensorEventConnection::sendEvents(
sensors_event_t const* buffer, size_t numEvents,
sensors_event_t* scratch)
@ -872,7 +848,7 @@ status_t SensorService::SensorEventConnection::sendEvents(
ssize_t size = SensorEventQueue::write(mChannel, &flushCompleteEvent, 1);
if (size < 0) {
// ALOGW("dropping %d events on the floor", count);
countFlushCompleteEvents(scratch, count);
countFlushCompleteEventsLocked(scratch, count);
return size;
}
ALOGD_IF(DEBUG_CONNECTIONS, "sent dropped flush complete event==%d ",
@ -889,17 +865,17 @@ status_t SensorService::SensorEventConnection::sendEvents(
// the destination doesn't accept events anymore, it's probably
// full. For now, we just drop the events on the floor.
// ALOGW("dropping %d events on the floor", count);
countFlushCompleteEvents(scratch, count);
Mutex::Autolock _l(mConnectionLock);
countFlushCompleteEventsLocked(scratch, count);
return size;
}
return size < 0 ? status_t(size) : status_t(NO_ERROR);
}
void SensorService::SensorEventConnection::countFlushCompleteEvents(
void SensorService::SensorEventConnection::countFlushCompleteEventsLocked(
sensors_event_t* scratch, const int numEventsDropped) {
ALOGD_IF(DEBUG_CONNECTIONS, "dropping %d events ", numEventsDropped);
Mutex::Autolock _l(mConnectionLock);
// Count flushComplete events in the events that are about to the dropped. These will be sent
// separately before the next batch of events.
for (int j = 0; j < numEventsDropped; ++j) {
@ -939,15 +915,25 @@ status_t SensorService::SensorEventConnection::setEventRate(
}
status_t SensorService::SensorEventConnection::flush() {
SensorDevice& dev(SensorDevice::getInstance());
const int halVersion = dev.getHalDeviceVersion();
Mutex::Autolock _l(mConnectionLock);
status_t err(NO_ERROR);
// Loop through all sensors for this connection and call flush on each of them.
for (size_t i = 0; i < mSensorInfo.size(); ++i) {
const int handle = mSensorInfo.keyAt(i);
status_t err_flush = mService->flushSensor(this, handle);
if (err_flush != NO_ERROR) {
ALOGE("Flush error handle=%d %s", handle, strerror(-err_flush));
if (halVersion < SENSORS_DEVICE_API_VERSION_1_1) {
// For older devices just increment pending flush count which will send a trivial
// flush complete event.
FlushInfo& flushInfo = mSensorInfo.editValueFor(handle);
flushInfo.mPendingFlushEventsToSend++;
} else {
status_t err_flush = mService->flushSensor(this, handle);
if (err_flush != NO_ERROR) {
ALOGE("Flush error handle=%d %s", handle, strerror(-err_flush));
}
err = (err_flush != NO_ERROR) ? err_flush : err;
}
err = (err_flush != NO_ERROR) ? err_flush : err;
}
return err;
}

3
services/sensorservice/SensorService.h
View File

@ -83,7 +83,7 @@ class SensorService :
// Count the number of flush complete events which are about to be dropped in the buffer.
// Increment mPendingFlushEventsToSend in mSensorInfo. These flush complete events will be
// sent separately before the next batch of events.
void countFlushCompleteEvents(sensors_event_t* scratch, int numEventsDropped);
void countFlushCompleteEventsLocked(sensors_event_t* scratch, int numEventsDropped);
sp<SensorService> const mService;
sp<BitTube> mChannel;
@ -112,7 +112,6 @@ class SensorService :
bool addSensor(int32_t handle);
bool removeSensor(int32_t handle);
void setFirstFlushPending(int32_t handle, bool value);
void incrementPendingFlushCount(int32_t handle);
void dump(String8& result);
uid_t getUid() const { return mUid; }