[SPARC64]: Fix oops on runlevel change with serial console.

Incorrect uart_write_wakeup() calls cause reference to a
NULL tty pointer in sunsab and sunzilog serial drivers.

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 4 deletions

diff --git a/drivers/serial/sunsab.c b/drivers/serial/sunsab.c
index e971156daa60..ba9381fd3f2d 100644
--- a/drivers/serial/sunsab.c
+++ b/drivers/serial/sunsab.c
@@ -274,7 +274,6 @@ static void transmit_chars(struct uart_sunsab_port *up,
         if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
                 up->interrupt_mask1 |= SAB82532_IMR1_XPR;
                 writeb(up->interrupt_mask1, &up->regs->w.imr1);
-                uart_write_wakeup(&up->port);
                 return;
         }
 
diff --git a/drivers/serial/sunzilog.c b/drivers/serial/sunzilog.c
index d75445738c88..7653d6cf05af 100644
--- a/drivers/serial/sunzilog.c
+++ b/drivers/serial/sunzilog.c
@@ -517,10 +517,9 @@ static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
         if (up->port.info == NULL)
                 goto ack_tx_int;
         xmit = &up->port.info->xmit;
-        if (uart_circ_empty(xmit)) {
-                uart_write_wakeup(&up->port);
+        if (uart_circ_empty(xmit))
                 goto ack_tx_int;
-        }
+
         if (uart_tx_stopped(&up->port))
                 goto ack_tx_int;