USB: fix usb serial pm counter decrement for disconnected interfaces
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@suse.de>
Cc: Stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 3bcf334..3537986 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -283,7 +283,10 @@
}
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);
}