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path: root/drivers/tty/serial/serial_core.c
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Diffstat (limited to 'drivers/tty/serial/serial_core.c')
-rw-r--r--drivers/tty/serial/serial_core.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 9a01ee4dda6d..fbf6c5ad222f 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -174,8 +174,12 @@ static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
if (tty->termios.c_cflag & CBAUD)
uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR);
}
-
- if (tty_port_cts_enabled(port)) {
+ /*
+ * if hw support flow control without software intervention,
+ * then skip the below check
+ */
+ if (tty_port_cts_enabled(port) &&
+ !(uport->flags & UPF_HARD_FLOW)) {
spin_lock_irq(&uport->lock);
if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS))
tty->hw_stopped = 1;
@@ -2775,7 +2779,9 @@ void uart_handle_cts_change(struct uart_port *uport, unsigned int status)
uport->icount.cts++;
- if (tty_port_cts_enabled(port)) {
+ /* skip below code if the hw flow control is supported */
+ if (tty_port_cts_enabled(port) &&
+ !(uport->flags & UPF_HARD_FLOW)) {
if (tty->hw_stopped) {
if (status) {
tty->hw_stopped = 0;