This patch (as1230) consolidates code in usb_unbind_interface() and
usb_driver_release_interface(). In fact, it makes release_interface
call unbind_interface, thereby removing the need for duplicated code.
It works like this: If the interface has already been registered with
the driver core when a driver releases it, then the usual driver-core
mechanism will call unbind_interface. If it hasn't been unregistered
then we will make the call ourselves.
As a nice bonus, drivers now don't have to worry about whether their
disconnect method will get called when they release an interface -- it
always will. Previously it would be called only if the interface was
registered.
Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
---
Index: usb-2.6/drivers/usb/core/driver.c
===================================================================
--- usb-2.6.orig/drivers/usb/core/driver.c
+++ usb-2.6/drivers/usb/core/driver.c
@@ -385,7 +385,6 @@ void usb_driver_release_interface(struct
struct usb_interface *iface)
{
struct device *dev = &iface->dev;
- struct usb_device *udev = interface_to_usbdev(iface);
/* this should never happen, don't release something that's not ours */
if (!dev->driver || dev->driver != &driver->drvwrap.driver)
@@ -394,23 +393,19 @@ void usb_driver_release_interface(struct
/* don't release from within disconnect() */
if (iface->condition != USB_INTERFACE_BOUND)
return;
+ iface->condition = USB_INTERFACE_UNBINDING;
- /* don't release if the interface hasn't been added yet */
+ /* Release via the driver core only if the interface
+ * has already been registered
+ */
if (device_is_registered(dev)) {
- iface->condition = USB_INTERFACE_UNBINDING;
device_release_driver(dev);
} else {
- iface->condition = USB_INTERFACE_UNBOUND;
- usb_cancel_queued_reset(iface);
+ down(&dev->sem);
+ usb_unbind_interface(dev);
+ dev->driver = NULL;
+ up(&dev->sem);
}
- dev->driver = NULL;
- usb_set_intfdata(iface, NULL);
-
- usb_pm_lock(udev);
- iface->condition = USB_INTERFACE_UNBOUND;
- mark_quiesced(iface);
- iface->needs_remote_wakeup = 0;
- usb_pm_unlock(udev);
}
EXPORT_SYMBOL_GPL(usb_driver_release_interface);
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