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 <s...@ravnborg.org>
cc: David S. Miller <da...@davemloft.net>
cc: <sparcli...@vger.kernel.org>
Signed-off-by: Peter Hurley <pe...@hurleysoftware.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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