From: Alan Stern <stern@rowland.harvard.edu>
Date: Tue, 1 Sep 2009 15:39:22 +0000 (-0400)
Subject: usb-serial: fix termios initialization logic
X-Git-Tag: firefly_0821_release~12907^2~4
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7e29bb4b779f4f35385e6f21994758845bf14d23;p=firefly-linux-kernel-4.4.55.git

usb-serial: fix termios initialization logic

This patch (as1288) fixes the initialization logic in
serial_install().  A new tty always needs to have a termios
initialized no matter what, not just in the case where the lower
driver will override the termios settings.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 7d207d91a6a8..1bc0a24b896b 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -210,22 +210,21 @@ static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
 	if (!try_module_get(serial->type->driver.owner))
 		goto error_module_get;
 
+	/* perform the standard setup */
+	retval = tty_init_termios(tty);
+	if (retval)
+		goto error_init_termios;
+
 	retval = usb_autopm_get_interface(serial->interface);
 	if (retval)
 		goto error_get_interface;
 
-	/* If the termios setup has yet to be done */
-	if (tty->driver->termios[idx] == NULL) {
-		/* perform the standard setup */
-		retval = tty_init_termios(tty);
-		if (retval)
-			goto error_init_termios;
-		/* allow the driver to update it */
-		if (serial->type->init_termios)
-			serial->type->init_termios(tty);
-	}
 	mutex_unlock(&serial->disc_mutex);
 
+	/* allow the driver to update the settings */
+	if (serial->type->init_termios)
+		serial->type->init_termios(tty);
+
 	tty->driver_data = port;
 
 	/* Final install (we use the default method) */
@@ -234,9 +233,8 @@ static int serial_install(struct tty_driver *driver, struct tty_struct *tty)
 	driver->ttys[idx] = tty;
 	return retval;
 
- error_init_termios:
-	usb_autopm_put_interface(serial->interface);
  error_get_interface:
+ error_init_termios:
 	module_put(serial->type->driver.owner);
  error_module_get:
  error_no_port: