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USB: pl2303: fix abuse of interface data 

Fix abuse of interface data which was used to signal device disconnect.

Use the usb_serial disconnect flag and mutex where appropriate.

Note that tiocmget does not need to check for disconnect as it does not
access the device.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2012-04-25 15:56:31 +02:00 committed by Greg Kroah-Hartman
parent 1c51766924
commit 6f1efd6c5a
1 changed files with 10 additions and 7 deletions
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17
drivers/usb/serial/pl2303.c
View File

@ -523,12 +523,11 @@ static int pl2303_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
u8 control;
if (!usb_get_intfdata(port->serial->interface))
return -ENODEV;
int ret;
spin_lock_irqsave(&priv->lock, flags);
if (set & TIOCM_RTS)
@ -542,7 +541,14 @@ static int pl2303_tiocmset(struct tty_struct *tty,
control = priv->line_control;
spin_unlock_irqrestore(&priv->lock, flags);
return set_control_lines(port->serial->dev, control);
mutex_lock(&serial->disc_mutex);
if (!serial->disconnected)
ret = set_control_lines(serial->dev, control);
else
ret = -ENODEV;
mutex_unlock(&serial->disc_mutex);
return ret;
}
static int pl2303_tiocmget(struct tty_struct *tty)
@ -556,9 +562,6 @@ static int pl2303_tiocmget(struct tty_struct *tty)
dbg("%s (%d)", __func__, port->number);
if (!usb_get_intfdata(port->serial->interface))
return -ENODEV;
spin_lock_irqsave(&priv->lock, flags);
mcr = priv->line_control;
status = priv->line_status;