diff options
| -rw-r--r-- | tmk_core/protocol/chibios/usb_driver.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/tmk_core/protocol/chibios/usb_driver.c b/tmk_core/protocol/chibios/usb_driver.c index cc0ce7600f..eb72f8ff6d 100644 --- a/tmk_core/protocol/chibios/usb_driver.c +++ b/tmk_core/protocol/chibios/usb_driver.c @@ -80,7 +80,19 @@ static bool qmkusb_start_receive(QMKUSBDriver *qmkusbp) { * Interface implementation. */ -static size_t _write(void *ip, const uint8_t *bp, size_t n) { return obqWriteTimeout(&((QMKUSBDriver *)ip)->obqueue, bp, n, TIME_INFINITE); } +static size_t _write(void *ip, const uint8_t *bp, size_t n) { + output_buffers_queue_t *obqueue = &((QMKUSBDriver *)ip)->obqueue; + chSysLock(); + const bool full = obqIsFullI(obqueue); + chSysUnlock(); + if (full || bqIsSuspendedX(obqueue)) { + /* Discard any writes while the queue is suspended or full, i.e. the hidraw + interface is not open. If we tried to send with an infinite timeout, we + would deadlock the keyboard otherwise. */ + return -1; + } + return obqWriteTimeout(obqueue, bp, n, TIME_INFINITE); +} static size_t _read(void *ip, uint8_t *bp, size_t n) { return ibqReadTimeout(&((QMKUSBDriver *)ip)->ibqueue, bp, n, TIME_INFINITE); } |