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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
/
sunzilog.c
diff --git
a/drivers/tty/serial/sunzilog.c
b/drivers/tty/serial/sunzilog.c
index a85db8b8715639d01193c3ce394de1a058783314..02df3940b95e4e14d5db2c4b35eb8a0ebe70be71 100644
(file)
--- 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);