uart_throttle() assumes that a driver provides a throttle function in
uart_ops. But not all drivers do and there seems to nothing in
serial_core that would set it either. Thus, check it before calling.
Reported-by: Nuno Gonçalves <nunojpg@xxxxxxxxx>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
---
drivers/tty/serial/serial_core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 6a8963caf954..18c9d46e0b85 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -697,7 +697,8 @@ static void uart_throttle(struct tty_struct *tty)
mask |= UPSTAT_AUTORTS;
if (port->status & mask) {
- port->ops->throttle(port);
+ if (port->ops->throttle)
+ port->ops->throttle(port);
mask &= ~port->status;
}
--
tg: (19317433057d..) serial/fix-uart_throttle (depends on: tty-linus)
