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bt: Fix race condition when disconnect during TX (#1260)

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* bt: Fix race condition when disconnect during TX
* bt: Move flag clear to not be in middle of other logic
* bt: Bail out of send bytes a little bit earlier

Co-authored-by: gornekich <n.gorbadey@gmail.com>
Co-authored-by: あく <alleteam@gmail.com>
This commit is contained in:
Yukai Li 2022-05-23 15:43:39 -06:00 committed by GitHub
parent eb83b0f02a
commit f90c9320d9
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 3 deletions
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16
applications/bt/bt_service/bt.c Executable file → Normal file
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@ -167,7 +167,11 @@ static void bt_rpc_send_bytes_callback(void* context, uint8_t* bytes, size_t byt
furi_assert(context);
Bt* bt = context;
osEventFlagsClear(bt->rpc_event, BT_RPC_EVENT_ALL);
if(osEventFlagsGet(bt->rpc_event) & BT_RPC_EVENT_DISCONNECTED) {
// Early stop from sending if we're already disconnected
return;
}
osEventFlagsClear(bt->rpc_event, BT_RPC_EVENT_ALL & (~BT_RPC_EVENT_DISCONNECTED));
size_t bytes_sent = 0;
while(bytes_sent < bytes_len) {
size_t bytes_remain = bytes_len - bytes_sent;
@ -178,10 +182,14 @@ static void bt_rpc_send_bytes_callback(void* context, uint8_t* bytes, size_t byt
furi_hal_bt_serial_tx(&bytes[bytes_sent], bytes_remain);
bytes_sent += bytes_remain;
}
uint32_t event_flag =
osEventFlagsWait(bt->rpc_event, BT_RPC_EVENT_ALL, osFlagsWaitAny, osWaitForever);
// We want BT_RPC_EVENT_DISCONNECTED to stick, so don't clear
uint32_t event_flag = osEventFlagsWait(
bt->rpc_event, BT_RPC_EVENT_ALL, osFlagsWaitAny | osFlagsNoClear, osWaitForever);
if(event_flag & BT_RPC_EVENT_DISCONNECTED) {
break;
} else {
// If we didn't get BT_RPC_EVENT_DISCONNECTED, then clear everything else
osEventFlagsClear(bt->rpc_event, BT_RPC_EVENT_ALL & (~BT_RPC_EVENT_DISCONNECTED));
}
}
}
@ -197,6 +205,8 @@ static bool bt_on_gap_event_callback(GapEvent event, void* context) {
bt->status = BtStatusConnected;
BtMessage message = {.type = BtMessageTypeUpdateStatus};
furi_check(osMessageQueuePut(bt->message_queue, &message, 0, osWaitForever) == osOK);
// Clear BT_RPC_EVENT_DISCONNECTED because it might be set from previous session
osEventFlagsClear(bt->rpc_event, BT_RPC_EVENT_DISCONNECTED);
if(bt->profile == BtProfileSerial) {
// Open RPC session
bt->rpc_session = rpc_session_open(bt->rpc);