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path: root/drivers/tty/serial/sunzilog.c
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Diffstat (limited to 'drivers/tty/serial/sunzilog.c')
-rw-r--r--drivers/tty/serial/sunzilog.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c
index a85db8b8715..02df3940b95 100644
--- a/drivers/tty/serial/sunzilog.c
+++ b/drivers/tty/serial/sunzilog.c
@@ -703,6 +703,8 @@ static void sunzilog_start_tx(struct uart_port *port)
} else {
struct circ_buf *xmit = &port->state->xmit;
+ if (uart_circ_empty(xmit))
+ return;
writeb(xmit->buf[xmit->tail], &channel->data);
ZSDELAY();
ZS_WSYNC(channel);