diff options
| author | Johan Hovold <jhovold@gmail.com> | 2012-04-25 15:56:31 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-04-25 11:37:19 -0700 |
| commit | 6f1efd6c5aa63ddcfe1ffc60ade716f5421766f4 (patch) | |
| tree | 48386a18f24bd24f6ae857e0a3c1a43960c032c4 /drivers/usb/serial/pl2303.c | |
| parent | 1c5176692457c3f249559d29a69affad7447b326 (diff) | |
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>
Diffstat (limited to 'drivers/usb/serial/pl2303.c')
| -rw-r--r-- | drivers/usb/serial/pl2303.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c index a1a9062954c..4917b4e79bb 100644 --- a/drivers/usb/serial/pl2303.c +++ b/drivers/usb/serial/pl2303.c @@ -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; |