[smart/tty] skip configure of rt_serial on tty open (#9152)

Skip configure on open since all configs are copied from the current
configuration on device. So we don't bother to set it back to device
again.

Changes:

- test and skip configuration on open() of tty device

Signed-off-by: Shell <[email protected]>

1 files changed, 10 insertions, 0 deletions

diff --git a/components/drivers/serial/serial_tty.c b/components/drivers/serial/serial_tty.c
index f75123eba2..bbf61f8ae0 100644
--- a/components/drivers/serial/serial_tty.c
+++ b/components/drivers/serial/serial_tty.c
@@ -298,6 +298,16 @@ static int serial_tty_param(struct lwp_tty *tp, struct termios *t)
     RT_ASSERT(softc);
     serial = softc->parent;
 
+    if (!tty_opened(tp))
+    {
+        /**
+         * skip configure on open since all configs are copied from the current
+         * configuration on device. So we don't bother to set it back to device
+         * again.
+         */
+        return RT_EOK;
+    }
+
     cfsetispeed(t, t->__c_ispeed);
     return rt_device_control(&(serial->parent), TCSETS, t);
 }