Merge tag 'v3.17-rockchip-rk3288' of git://git.kernel.org/pub/scm/linux/kernel/git...

[firefly-linux-kernel-4.4.55.git] / drivers / tty / serial / ip22zilog.c

diff --git a/drivers/tty/serial/ip22zilog.c b/drivers/tty/serial/ip22zilog.c
index 1efd4c36ba0cace6da8d30623100f50103dce37f..99b7b869786177a2ba57ee18a554db7d48c09371 100644 (file)
--- a/drivers/tty/serial/ip22zilog.c
+++ b/drivers/tty/serial/ip22zilog.c
@@ -603,6 +603,8 @@ static void ip22zilog_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);