mxser: remove pointless xmit_buf checks

xmit_buf is supposed to exist in all these functions. I.e. from
tty_port_operations::activate() to ::shutdown(). So remove these checks.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20211118073125.12283-7-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index eb5fb4fb2aefa649fdf192db440e2ec8f7aafa92..6e5e1c74bf3eea7c3b73d5f8df139cc96a33677d 100644 (file)
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -929,9 +929,6 @@ static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int cou
        struct mxser_port *info = tty->driver_data;
        unsigned long flags;
 
-       if (!info->port.xmit_buf)
-               return 0;
-
        while (1) {
                c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
                                          SERIAL_XMIT_SIZE - info->xmit_head));
@@ -962,9 +959,6 @@ static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
        struct mxser_port *info = tty->driver_data;
        unsigned long flags;
 
-       if (!info->port.xmit_buf)
-               return 0;
-
        if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
                return 0;
 
@@ -982,7 +976,7 @@ static void mxser_flush_chars(struct tty_struct *tty)
 {
        struct mxser_port *info = tty->driver_data;
 
-       if (!info->xmit_cnt || tty->flow.stopped || !info->port.xmit_buf ||
+       if (!info->xmit_cnt || tty->flow.stopped ||
                        (tty->hw_stopped && !mxser_16550A_or_MUST(info)))
                return;
 
@@ -1397,7 +1391,7 @@ static void mxser_start(struct tty_struct *tty)
        unsigned long flags;
 
        spin_lock_irqsave(&info->slock, flags);
-       if (info->xmit_cnt && info->port.xmit_buf)
+       if (info->xmit_cnt)
                __mxser_start_tx(info);
        spin_unlock_irqrestore(&info->slock, flags);
 }
@@ -1631,9 +1625,6 @@ static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port
                return;
        }
 
-       if (port->port.xmit_buf == NULL)
-               return;
-
        if (!port->xmit_cnt || tty->flow.stopped ||
                        (tty->hw_stopped && !mxser_16550A_or_MUST(port))) {
                __mxser_stop_tx(port);