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[PATCH] USB: console: fix oops

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Prevent NULL dereference when used as a USB-serial console.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Guennadi Liakhovetski 2006-04-13 22:27:12 +02:00 committed by Greg Kroah-Hartman
parent c10746dbb3
commit 57845bd104
1 changed files with 5 additions and 5 deletions
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10
drivers/usb/serial/ftdi_sio.c
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@ -1261,7 +1261,6 @@ static void ftdi_shutdown (struct usb_serial *serial)
static int ftdi_open (struct usb_serial_port *port, struct file *filp)
{ /* ftdi_open */
struct termios tmp_termios;
struct usb_device *dev = port->serial->dev;
struct ftdi_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
@ -1271,8 +1270,8 @@ static int ftdi_open (struct usb_serial_port *port, struct file *filp)
dbg("%s", __FUNCTION__);
port->tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
if (port->tty)
port->tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
/* No error checking for this (will get errors later anyway) */
/* See ftdi_sio.h for description of what is reset */
@ -1286,7 +1285,8 @@ static int ftdi_open (struct usb_serial_port *port, struct file *filp)
This is same behaviour as serial.c/rs_open() - Kuba */
/* ftdi_set_termios will send usb control messages */
ftdi_set_termios(port, &tmp_termios);
if (port->tty)
ftdi_set_termios(port, NULL);
/* FIXME: Flow control might be enabled, so it should be checked -
we have no control of defaults! */
@ -1867,7 +1867,7 @@ static void ftdi_set_termios (struct usb_serial_port *port, struct termios *old_
err("%s urb failed to set baudrate", __FUNCTION__);
}
/* Ensure RTS and DTR are raised when baudrate changed from 0 */
if ((old_termios->c_cflag & CBAUD) == B0) {
if (!old_termios || (old_termios->c_cflag & CBAUD) == B0) {
set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
}
}