usb-console: pass baud from console to the initial tty open

The usb console code has had a long standing problem of not being able
to pass the baud rate from the kernel argument console=ttyUSB0,BAUD
down to the initial tty open, unless you were willing to settle for
9600 baud.

The solution is to directly use tty_init_termios() in
usb_console_setup() as this will preserve any changes to the initial
termios setting on future opens.

CC: Alan Cox <alan@linux.intel.com>
CC: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/console.c b/drivers/usb/serial/console.c
index 4ea64fe..1ee6b2a 100644 (file)
--- a/drivers/usb/serial/console.c
+++ b/drivers/usb/serial/console.c
@@ -66,7 +66,7 @@ static int usb_console_setup(struct console *co, char *options)
        struct usb_serial_port *port;
        int retval;
        struct tty_struct *tty = NULL;
-       struct ktermios *termios = NULL, dummy;
+       struct ktermios dummy;
 
        dbg("%s", __func__);
 
@@ -141,15 +141,14 @@ static int usb_console_setup(struct console *co, char *options)
                                goto reset_open_count;
                        }
                        kref_init(&tty->kref);
-                       termios = kzalloc(sizeof(*termios), GFP_KERNEL);
-                       if (!termios) {
+                       tty_port_tty_set(&port->port, tty);
+                       tty->driver = usb_serial_tty_driver;
+                       tty->index = co->index;
+                       if (tty_init_termios(tty)) {
                                retval = -ENOMEM;
                                err("no more memory");
                                goto free_tty;
                        }
-                       memset(&dummy, 0, sizeof(struct ktermios));
-                       tty->termios = termios;
-                       tty_port_tty_set(&port->port, tty);
                }
 
                /* only call the device specific open if this
@@ -161,16 +160,16 @@ static int usb_console_setup(struct console *co, char *options)
 
                if (retval) {
                        err("could not open USB console port");
-                       goto free_termios;
+                       goto fail;
                }
 
                if (serial->type->set_termios) {
-                       termios->c_cflag = cflag;
-                       tty_termios_encode_baud_rate(termios, baud, baud);
+                       tty->termios->c_cflag = cflag;
+                       tty_termios_encode_baud_rate(tty->termios, baud, baud);
+                       memset(&dummy, 0, sizeof(struct ktermios));
                        serial->type->set_termios(tty, port, &dummy);
 
                        tty_port_tty_set(&port->port, NULL);
-                       kfree(termios);
                        kfree(tty);
                }
                set_bit(ASYNCB_INITIALIZED, &port->port.flags);
@@ -185,8 +184,7 @@ static int usb_console_setup(struct console *co, char *options)
        mutex_unlock(&serial->disc_mutex);
        return retval;
 
- free_termios:
-       kfree(termios);
+ fail:
        tty_port_tty_set(&port->port, NULL);
  free_tty:
        kfree(tty);