Camera: Fix race between initialize() and statusCallback (take 2)
Cache the HAL status callback before provider initialization is
complete, and once initialization is complete, send all cached
callbacks.
Test: Camera CTS
Bug: 159201665
Change-Id: Ida86fe908f456832b9cba314d299bab056bc52a2
diff --git a/services/camera/libcameraservice/common/CameraProviderManager.cpp b/services/camera/libcameraservice/common/CameraProviderManager.cpp
index f115fd8..876d70d 100644
--- a/services/camera/libcameraservice/common/CameraProviderManager.cpp
+++ b/services/camera/libcameraservice/common/CameraProviderManager.cpp
@@ -1453,7 +1453,40 @@
ALOGI("Camera provider %s ready with %zu camera devices",
mProviderName.c_str(), mDevices.size());
- mInitialized = true;
+ // Process cached status callbacks
+ std::unique_ptr<std::vector<CameraStatusInfoT>> cachedStatus =
+ std::make_unique<std::vector<CameraStatusInfoT>>();
+ {
+ std::lock_guard<std::mutex> lock(mInitLock);
+
+ for (auto& statusInfo : mCachedStatus) {
+ std::string id, physicalId;
+ status_t res = OK;
+ if (statusInfo.isPhysicalCameraStatus) {
+ res = physicalCameraDeviceStatusChangeLocked(&id, &physicalId,
+ statusInfo.cameraId, statusInfo.physicalCameraId, statusInfo.status);
+ } else {
+ res = cameraDeviceStatusChangeLocked(&id, statusInfo.cameraId, statusInfo.status);
+ }
+ if (res == OK) {
+ cachedStatus->emplace_back(statusInfo.isPhysicalCameraStatus,
+ id.c_str(), physicalId.c_str(), statusInfo.status);
+ }
+ }
+ mCachedStatus.clear();
+
+ mInitialized = true;
+ }
+
+ // The cached status change callbacks cannot be fired directly from this
+ // function, due to same-thread deadlock trying to acquire mInterfaceMutex
+ // twice.
+ if (listener != nullptr) {
+ mInitialStatusCallbackFuture = std::async(std::launch::async,
+ &CameraProviderManager::ProviderInfo::notifyInitialStatusChange, this,
+ listener, std::move(cachedStatus));
+ }
+
return OK;
}
@@ -1731,103 +1764,139 @@
CameraDeviceStatus newStatus) {
sp<StatusListener> listener;
std::string id;
- bool initialized = false;
+ std::lock_guard<std::mutex> lock(mInitLock);
+
+ if (!mInitialized) {
+ mCachedStatus.emplace_back(false /*isPhysicalCameraStatus*/,
+ cameraDeviceName.c_str(), std::string().c_str(), newStatus);
+ return hardware::Void();
+ }
+
{
std::lock_guard<std::mutex> lock(mLock);
- bool known = false;
- for (auto& deviceInfo : mDevices) {
- if (deviceInfo->mName == cameraDeviceName) {
- ALOGI("Camera device %s status is now %s, was %s", cameraDeviceName.c_str(),
- deviceStatusToString(newStatus), deviceStatusToString(deviceInfo->mStatus));
- deviceInfo->mStatus = newStatus;
- // TODO: Handle device removal (NOT_PRESENT)
- id = deviceInfo->mId;
- known = true;
- break;
- }
- }
- // Previously unseen device; status must not be NOT_PRESENT
- if (!known) {
- if (newStatus == CameraDeviceStatus::NOT_PRESENT) {
- ALOGW("Camera provider %s says an unknown camera device %s is not present. Curious.",
- mProviderName.c_str(), cameraDeviceName.c_str());
- return hardware::Void();
- }
- addDevice(cameraDeviceName, newStatus, &id);
- } else if (newStatus == CameraDeviceStatus::NOT_PRESENT) {
- removeDevice(id);
+ if (OK != cameraDeviceStatusChangeLocked(&id, cameraDeviceName, newStatus)) {
+ return hardware::Void();
}
listener = mManager->getStatusListener();
- initialized = mInitialized;
- if (reCacheConcurrentStreamingCameraIdsLocked() != OK) {
- ALOGE("%s: CameraProvider %s could not re-cache concurrent streaming camera id list ",
- __FUNCTION__, mProviderName.c_str());
- }
}
+
// Call without lock held to allow reentrancy into provider manager
- // Don't send the callback if providerInfo hasn't been initialized.
- // CameraService will initialize device status after provider is
- // initialized
- if (listener != nullptr && initialized) {
+ if (listener != nullptr) {
listener->onDeviceStatusChanged(String8(id.c_str()), newStatus);
}
+
return hardware::Void();
}
+status_t CameraProviderManager::ProviderInfo::cameraDeviceStatusChangeLocked(
+ std::string* id, const hardware::hidl_string& cameraDeviceName,
+ CameraDeviceStatus newStatus) {
+ bool known = false;
+ std::string cameraId;
+ for (auto& deviceInfo : mDevices) {
+ if (deviceInfo->mName == cameraDeviceName) {
+ ALOGI("Camera device %s status is now %s, was %s", cameraDeviceName.c_str(),
+ deviceStatusToString(newStatus), deviceStatusToString(deviceInfo->mStatus));
+ deviceInfo->mStatus = newStatus;
+ // TODO: Handle device removal (NOT_PRESENT)
+ cameraId = deviceInfo->mId;
+ known = true;
+ break;
+ }
+ }
+ // Previously unseen device; status must not be NOT_PRESENT
+ if (!known) {
+ if (newStatus == CameraDeviceStatus::NOT_PRESENT) {
+ ALOGW("Camera provider %s says an unknown camera device %s is not present. Curious.",
+ mProviderName.c_str(), cameraDeviceName.c_str());
+ return BAD_VALUE;
+ }
+ addDevice(cameraDeviceName, newStatus, &cameraId);
+ } else if (newStatus == CameraDeviceStatus::NOT_PRESENT) {
+ removeDevice(cameraId);
+ }
+ if (reCacheConcurrentStreamingCameraIdsLocked() != OK) {
+ ALOGE("%s: CameraProvider %s could not re-cache concurrent streaming camera id list ",
+ __FUNCTION__, mProviderName.c_str());
+ }
+ *id = cameraId;
+ return OK;
+}
+
hardware::Return<void> CameraProviderManager::ProviderInfo::physicalCameraDeviceStatusChange(
const hardware::hidl_string& cameraDeviceName,
const hardware::hidl_string& physicalCameraDeviceName,
CameraDeviceStatus newStatus) {
sp<StatusListener> listener;
std::string id;
+ std::string physicalId;
+ std::lock_guard<std::mutex> lock(mInitLock);
+
+ if (!mInitialized) {
+ mCachedStatus.emplace_back(true /*isPhysicalCameraStatus*/, cameraDeviceName,
+ physicalCameraDeviceName, newStatus);
+ return hardware::Void();
+ }
+
{
std::lock_guard<std::mutex> lock(mLock);
- if (!mInitialized) return hardware::Void();
- bool known = false;
- for (auto& deviceInfo : mDevices) {
- if (deviceInfo->mName == cameraDeviceName) {
- id = deviceInfo->mId;
-
- if (!deviceInfo->mIsLogicalCamera) {
- ALOGE("%s: Invalid combination of camera id %s, physical id %s",
- __FUNCTION__, id.c_str(), physicalCameraDeviceName.c_str());
- return hardware::Void();
- }
- if (std::find(deviceInfo->mPhysicalIds.begin(), deviceInfo->mPhysicalIds.end(),
- physicalCameraDeviceName) == deviceInfo->mPhysicalIds.end()) {
- ALOGE("%s: Invalid combination of camera id %s, physical id %s",
- __FUNCTION__, id.c_str(), physicalCameraDeviceName.c_str());
- return hardware::Void();
- }
- ALOGI("Camera device %s physical device %s status is now %s",
- cameraDeviceName.c_str(), physicalCameraDeviceName.c_str(),
- deviceStatusToString(newStatus));
- known = true;
- break;
- }
- }
- // Previously unseen device; status must not be NOT_PRESENT
- if (!known) {
- ALOGW("Camera provider %s says an unknown camera device %s-%s is not present. Curious.",
- mProviderName.c_str(), cameraDeviceName.c_str(),
- physicalCameraDeviceName.c_str());
+ if (OK != physicalCameraDeviceStatusChangeLocked(&id, &physicalId, cameraDeviceName,
+ physicalCameraDeviceName, newStatus)) {
return hardware::Void();
}
+
listener = mManager->getStatusListener();
}
// Call without lock held to allow reentrancy into provider manager
- // Don't send the callback if providerInfo hasn't been initialized.
- // CameraService will initialize device status after provider is
- // initialized
if (listener != nullptr) {
- String8 physicalId(physicalCameraDeviceName.c_str());
listener->onDeviceStatusChanged(String8(id.c_str()),
- physicalId, newStatus);
+ String8(physicalId.c_str()), newStatus);
}
return hardware::Void();
}
+status_t CameraProviderManager::ProviderInfo::physicalCameraDeviceStatusChangeLocked(
+ std::string* id, std::string* physicalId,
+ const hardware::hidl_string& cameraDeviceName,
+ const hardware::hidl_string& physicalCameraDeviceName,
+ CameraDeviceStatus newStatus) {
+ bool known = false;
+ std::string cameraId;
+ for (auto& deviceInfo : mDevices) {
+ if (deviceInfo->mName == cameraDeviceName) {
+ cameraId = deviceInfo->mId;
+ if (!deviceInfo->mIsLogicalCamera) {
+ ALOGE("%s: Invalid combination of camera id %s, physical id %s",
+ __FUNCTION__, cameraId.c_str(), physicalCameraDeviceName.c_str());
+ return BAD_VALUE;
+ }
+ if (std::find(deviceInfo->mPhysicalIds.begin(), deviceInfo->mPhysicalIds.end(),
+ physicalCameraDeviceName) == deviceInfo->mPhysicalIds.end()) {
+ ALOGE("%s: Invalid combination of camera id %s, physical id %s",
+ __FUNCTION__, cameraId.c_str(), physicalCameraDeviceName.c_str());
+ return BAD_VALUE;
+ }
+ ALOGI("Camera device %s physical device %s status is now %s",
+ cameraDeviceName.c_str(), physicalCameraDeviceName.c_str(),
+ deviceStatusToString(newStatus));
+ known = true;
+ break;
+ }
+ }
+ // Previously unseen device; status must not be NOT_PRESENT
+ if (!known) {
+ ALOGW("Camera provider %s says an unknown camera device %s-%s is not present. Curious.",
+ mProviderName.c_str(), cameraDeviceName.c_str(),
+ physicalCameraDeviceName.c_str());
+ return BAD_VALUE;
+ }
+
+ *id = cameraId;
+ *physicalId = physicalCameraDeviceName.c_str();
+ return OK;
+}
+
hardware::Return<void> CameraProviderManager::ProviderInfo::torchModeStatusChange(
const hardware::hidl_string& cameraDeviceName,
TorchModeStatus newStatus) {
@@ -1982,6 +2051,20 @@
return INVALID_OPERATION;
}
+void CameraProviderManager::ProviderInfo::notifyInitialStatusChange(
+ sp<StatusListener> listener,
+ std::unique_ptr<std::vector<CameraStatusInfoT>> cachedStatus) {
+ for (auto& statusInfo : *cachedStatus) {
+ if (statusInfo.isPhysicalCameraStatus) {
+ listener->onDeviceStatusChanged(String8(statusInfo.cameraId.c_str()),
+ String8(statusInfo.physicalCameraId.c_str()), statusInfo.status);
+ } else {
+ listener->onDeviceStatusChanged(
+ String8(statusInfo.cameraId.c_str()), statusInfo.status);
+ }
+ }
+}
+
template<class DeviceInfoT>
std::unique_ptr<CameraProviderManager::ProviderInfo::DeviceInfo>
CameraProviderManager::ProviderInfo::initializeDeviceInfo(
@@ -2685,9 +2768,11 @@
CameraProviderManager::ProviderInfo::~ProviderInfo() {
+ if (mInitialStatusCallbackFuture.valid()) {
+ mInitialStatusCallbackFuture.wait();
+ }
// Destruction of ProviderInfo is only supposed to happen when the respective
// CameraProvider interface dies, so do not unregister callbacks.
-
}
status_t CameraProviderManager::mapToStatusT(const Status& s) {
diff --git a/services/camera/libcameraservice/common/CameraProviderManager.h b/services/camera/libcameraservice/common/CameraProviderManager.h
index 281cb3d..a0e5f8f 100644
--- a/services/camera/libcameraservice/common/CameraProviderManager.h
+++ b/services/camera/libcameraservice/common/CameraProviderManager.h
@@ -22,6 +22,7 @@
#include <unordered_set>
#include <string>
#include <mutex>
+#include <future>
#include <camera/camera2/ConcurrentCamera.h>
#include <camera/CameraParameters2.h>
@@ -403,6 +404,15 @@
const hardware::hidl_string& physicalCameraDeviceName,
hardware::camera::common::V1_0::CameraDeviceStatus newStatus) override;
+ status_t cameraDeviceStatusChangeLocked(
+ std::string* id, const hardware::hidl_string& cameraDeviceName,
+ hardware::camera::common::V1_0::CameraDeviceStatus newStatus);
+ status_t physicalCameraDeviceStatusChangeLocked(
+ std::string* id, std::string* physicalId,
+ const hardware::hidl_string& cameraDeviceName,
+ const hardware::hidl_string& physicalCameraDeviceName,
+ hardware::camera::common::V1_0::CameraDeviceStatus newStatus);
+
// hidl_death_recipient interface - this locks the parent mInterfaceMutex
virtual void serviceDied(uint64_t cookie, const wp<hidl::base::V1_0::IBase>& who) override;
@@ -598,7 +608,27 @@
CameraProviderManager *mManager;
+ struct CameraStatusInfoT {
+ bool isPhysicalCameraStatus = false;
+ hardware::hidl_string cameraId;
+ hardware::hidl_string physicalCameraId;
+ hardware::camera::common::V1_0::CameraDeviceStatus status;
+ CameraStatusInfoT(bool isForPhysicalCamera, const hardware::hidl_string& id,
+ const hardware::hidl_string& physicalId,
+ hardware::camera::common::V1_0::CameraDeviceStatus s) :
+ isPhysicalCameraStatus(isForPhysicalCamera), cameraId(id),
+ physicalCameraId(physicalId), status(s) {}
+ };
+
+ // Lock to synchronize between initialize() and camera status callbacks
+ std::mutex mInitLock;
bool mInitialized = false;
+ std::vector<CameraStatusInfoT> mCachedStatus;
+ // End of scope for mInitLock
+
+ std::future<void> mInitialStatusCallbackFuture;
+ void notifyInitialStatusChange(sp<StatusListener> listener,
+ std::unique_ptr<std::vector<CameraStatusInfoT>> cachedStatus);
std::vector<std::unordered_set<std::string>> mConcurrentCameraIdCombinations;