adbd: respond to device-to-host control transfers.
Failing to write to the endpoint results in subsequent reads on ep0 to
fail with EL2HLT, so do an empty write to fulfill the transfer.
Bug: http://b/131867920
Test: manually tested with modified auto client
Change-Id: If2eec162ca4b31a9974c7bd5802be51cee9e2708
Merged-In: If2eec162ca4b31a9974c7bd5802be51cee9e2708
(cherry-picked from internal commit af086e9a95cb52cdc7432c58e221ab86fafed87a)
diff --git a/adb/daemon/usb.cpp b/adb/daemon/usb.cpp
index 707203a..4ec3ab2 100644
--- a/adb/daemon/usb.cpp
+++ b/adb/daemon/usb.cpp
@@ -380,7 +380,12 @@
<< ", wLength = " << static_cast<int>(event.u.setup.wLength);
if ((event.u.setup.bRequestType & USB_DIR_IN)) {
- LOG(WARNING) << "received a device-to-host control transfer, ignoring";
+ LOG(INFO) << "acking device-to-host control transfer";
+ ssize_t rc = adb_write(control_fd_.get(), "", 0);
+ if (rc != 0) {
+ PLOG(ERROR) << "failed to write empty packet to host";
+ break;
+ }
} else {
std::string buf;
buf.resize(event.u.setup.wLength + 1);