USB: serial: ch341: fix line settings after reset-resume

A recent change added support for modifying the default line-control
settings, but did not make sure that the modified settings were used as
part of reconfiguration after a device has been reset during resume.

This caused a port that was open before suspend to be unusable until
being closed and reopened.

Fixes: ba781bdf8662 ("USB: serial: ch341: add support for parity, frame
length, stop bits")
Signed-off-by: Johan Hovold <johan@kernel.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index 5343d65f3b52..eabdd05a2147 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -95,6 +95,7 @@ struct ch341_private {
         unsigned baud_rate; /* set baud rate */
         u8 line_control; /* set line control value RTS/DTR */
         u8 line_status; /* active status of modem control inputs */
+        u8 lcr;
 };
 
 static void ch341_set_termios(struct tty_struct *tty,
@@ -232,7 +233,7 @@ static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
         if (r < 0)
                 goto out;
 
-        r = ch341_init_set_baudrate(dev, priv, 0);
+        r = ch341_init_set_baudrate(dev, priv, priv->lcr);
         if (r < 0)
                 goto out;
 
@@ -397,6 +398,8 @@ static void ch341_set_termios(struct tty_struct *tty,
                 if (r < 0 && old_termios) {
                         priv->baud_rate = tty_termios_baud_rate(old_termios);
                         tty_termios_copy_hw(&tty->termios, old_termios);
+                } else if (r == 0) {
+                        priv->lcr = ctrl;
                 }
         }