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

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Date:	Tue,  2 Sep 2014 17:39:17 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>,
	"David S. Miller" <davem@...emloft.net>,
	<sparclinux@...r.kernel.org>
Subject: [PATCH 08/26] 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 <sam@...nborg.org>
cc: David S. Miller <davem@...emloft.net>
cc: <sparclinux@...r.kernel.org>
Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 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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