[patch 19/62] USB: fix usb serial pm counter decrement fordisconnected interfaces

[Greg KH]

2.6.26 -stable review patch.  If anyone has any objections, please let
us know.

------------------
From: Oliver Neukum <oliver@xxxxxxxxxx>

commit 62ad296b6ca78bd123864c138814c0a597873693 upstream

usb serial decrements the pm counter even if an interface has been
disconnected. If it was a logical disconnect the interface may belong
already to another driver. This patch introduces a check for disconnected
interfaces.

Signed-off-by: Oliver Neukum <oneukum@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/usb/serial/usb-serial.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -283,7 +283,10 @@ static void serial_close(struct tty_stru
 	}
 
 	if (port->open_count == 0) {
-		usb_autopm_put_interface(port->serial->interface);
+		mutex_lock(&port->serial->disc_mutex);
+		if (!port->serial->disconnected)
+			usb_autopm_put_interface(port->serial->interface);
+		mutex_unlock(&port->serial->disc_mutex);
 		module_put(port->serial->type->driver.owner);
 	}
 

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