From 98f8b83d6a504615f52a095acf92a2bdad985ae0 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 2 Sep 2014 17:39:17 -0400 Subject: [PATCH] serial: sunsab: Don't enable tx if tx stopped The serial core may call the UART driver's start_tx() even if tx is stopped; the UART driver must verify tx should be enabled before transmitting. Reported-by: Sam Ravnborg cc: David S. Miller cc: Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sunsab.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/sunsab.c b/drivers/tty/serial/sunsab.c index 0af75f8b98a4..b339fe4811cd 100644 --- a/drivers/tty/serial/sunsab.c +++ b/drivers/tty/serial/sunsab.c @@ -436,7 +436,7 @@ static void sunsab_start_tx(struct uart_port *port) struct circ_buf *xmit = &up->port.state->xmit; int i; - if (uart_circ_empty(xmit)) + if (uart_circ_empty(xmit) || uart_tx_stopped(port)) return; up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR); -- 2.20.1