drivers/serial: transmit lock should in pairs

Signed-off-by: chao an <anchao@xiaomi.com>
2022-11-03 17:54:58 +08:00 · 2022-11-03 17:54:58 +08:00 · a53cc533c0
parent b048428180
commit a53cc533c0
1 changed files with 1 additions and 0 deletions
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@ -469,6 +469,7 @@ static int uart_tcdrain(FAR uart_dev_t *dev,
              elapsed = clock_systime_ticks() - start;
              if (elapsed >= timeout)
                {
+                  nxmutex_unlock(&dev->xmit.lock);
                  return -ETIMEDOUT;
                }
            }