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-rw-r--r--drivers/tty/serial/serial_core.c31
-rw-r--r--include/linux/serial_core.h2
2 files changed, 29 insertions, 4 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 9d8796e77188..098bb99c2b9f 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -610,27 +610,50 @@ static void uart_send_xchar(struct tty_struct *tty, char ch)
static void uart_throttle(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
+ struct uart_port *port = state->uart_port;
+ uint32_t mask = 0;
if (I_IXOFF(tty))
+ mask |= UPF_SOFT_FLOW;
+ if (tty->termios.c_cflag & CRTSCTS)
+ mask |= UPF_HARD_FLOW;
+
+ if (port->flags & mask) {
+ port->ops->throttle(port);
+ mask &= ~port->flags;
+ }
+
+ if (mask & UPF_SOFT_FLOW)
uart_send_xchar(tty, STOP_CHAR(tty));
- if (tty->termios.c_cflag & CRTSCTS)
- uart_clear_mctrl(state->uart_port, TIOCM_RTS);
+ if (mask & UPF_HARD_FLOW)
+ uart_clear_mctrl(port, TIOCM_RTS);
}
static void uart_unthrottle(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->uart_port;
+ uint32_t mask = 0;
- if (I_IXOFF(tty)) {
+ if (I_IXOFF(tty))
+ mask |= UPF_SOFT_FLOW;
+ if (tty->termios.c_cflag & CRTSCTS)
+ mask |= UPF_HARD_FLOW;
+
+ if (port->flags & mask) {
+ port->ops->unthrottle(port);
+ mask &= ~port->flags;
+ }
+
+ if (mask & UPF_SOFT_FLOW) {
if (port->x_char)
port->x_char = 0;
else
uart_send_xchar(tty, START_CHAR(tty));
}
- if (tty->termios.c_cflag & CRTSCTS)
+ if (mask & UPF_HARD_FLOW)
uart_set_mctrl(port, TIOCM_RTS);
}
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index e2cda5d04e48..c6690a2a27fb 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -46,6 +46,8 @@ struct uart_ops {
unsigned int (*get_mctrl)(struct uart_port *);
void (*stop_tx)(struct uart_port *);
void (*start_tx)(struct uart_port *);
+ void (*throttle)(struct uart_port *);
+ void (*unthrottle)(struct uart_port *);
void (*send_xchar)(struct uart_port *, char ch);
void (*stop_rx)(struct uart_port *);
void (*enable_ms)(struct uart_port *);