serial: 8250: Fix race condition in RTS-after-send handling

Set em485->active_timer = NULL isn't always enough to take out the stop
timer. While there is a check that it acts in the right state (i.e.
waiting for RTS-after-send to pass after sending some chars) but the
following might happen:

 - CPU1: some chars send, shifter becomes empty, stop tx timer armed
 - CPU0: more chars send before RTS-after-send expired
 - CPU0: shifter empty irq, port lock taken
 - CPU1: tx timer triggers, waits for port lock
 - CPU0: em485->active_timer = &em485->stop_tx_timer, hrtimer_start(),
   releases lock()
 - CPU1: get lock, see em485->active_timer == &em485->stop_tx_timer,
   tear down RTS too early

This fix bases on research done by Steffen Trumtrar.

Fixes: b86f86e8e7c5 ("serial: 8250: fix potential deadlock in rs485-mode")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220215160236.344236-1-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 728d60b..d30a6c1 100644 (file)
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -1623,6 +1623,18 @@ static inline void start_tx_rs485(struct uart_port *port)
        struct uart_8250_port *up = up_to_u8250p(port);
        struct uart_8250_em485 *em485 = up->em485;
 
+       /*
+        * While serial8250_em485_handle_stop_tx() is a noop if
+        * em485->active_timer != &em485->stop_tx_timer, it might happen that
+        * the timer is still armed and triggers only after the current bunch of
+        * chars is send and em485->active_timer == &em485->stop_tx_timer again.
+        * So cancel the timer. There is still a theoretical race condition if
+        * the timer is already running and only comes around to check for
+        * em485->active_timer when &em485->stop_tx_timer is armed again.
+        */
+       if (em485->active_timer == &em485->stop_tx_timer)
+               hrtimer_try_to_cancel(&em485->stop_tx_timer);
+
        em485->active_timer = NULL;
 
        if (em485->tx_stopped) {