Three UART drivers (8250, atmel & amba-pl010) enable modem status
interrupts if the line discipline is changed to N_PPS. However,
the uart port flags may only be safely modified while holding the
port mutex.
Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/serial_core.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 1a2d90f..5209eaa 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1245,8 +1245,11 @@ static void uart_set_ldisc(struct tty_struct *tty)
struct uart_state *state = tty->driver_data;
struct uart_port *uport = state->uart_port;
- if (uport->ops->set_ldisc)
+ if (uport->ops->set_ldisc) {
+ mutex_lock(&state->port.mutex);
uport->ops->set_ldisc(uport, tty->termios.c_line);
+ mutex_unlock(&state->port.mutex);
+ }
}
static void uart_set_termios(struct tty_struct *tty,
--
2.1.3
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