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serial: imx: don't prepare to send if no data is available

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serial_core might call the .start_tx callback without any data being
available to send. In this case return early instead of going through
all the setup needed for sending which might include disabling RX in
RS485 half-duplex mode.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Uwe Kleine-König 2018-03-02 11:07:29 +01:00 committed by Greg Kroah-Hartman
parent 1866541492
commit 48669b69e3
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/serial/imx.c
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@ -651,6 +651,9 @@ static void imx_start_tx(struct uart_port *port)
struct imx_port *sport = (struct imx_port *)port;
u32 ucr1;
if (!sport->port.x_char && uart_circ_empty(&port->state->xmit))
return;
if (port->rs485.flags & SER_RS485_ENABLED) {
u32 ucr2;