[PATCH 08/26] serial: sunsab: Don't enable tx if tx stopped

[Peter Hurley]

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 <sam@xxxxxxxxxxxx>
cc: David S. Miller <davem@xxxxxxxxxxxxx>
cc: <sparclinux@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
---
 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 c83b1c6..448a93b 100644
--- a/drivers/tty/serial/sunsab.c
+++ b/drivers/tty/serial/sunsab.c
@@ -427,7 +427,7 @@ 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);
-- 
2.1.0

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