[PATCH] pl2303 - unplug device.

It's possible to unplug usb device and do tiocmset() and tiocmget() without
valid interface in pl2303 module.

The patch below check this and return -ENODEV if interface was removed.

From: Flavio Leitner <fbl@conectiva.com.br>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff -purN linux-05-04-11/drivers/usb/serial/pl2303.c linux-05-04-11.usb/drivers/usb/serial/pl2303.c

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 3368d2b0412d..a52115407ea1 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -677,6 +677,9 @@ static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
         unsigned long flags;
         u8 control;
 
+        if (!usb_get_intfdata(port->serial->interface))
+                return -ENODEV;
+
         spin_lock_irqsave (&priv->lock, flags);
         if (set & TIOCM_RTS)
                 priv->line_control |= CONTROL_RTS;
@@ -702,6 +705,9 @@ static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
 
         dbg("%s (%d)", __FUNCTION__, 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;