From: Alan Stern Date: Thu, 16 Apr 2009 19:35:09 +0000 (-0400) Subject: USB: consolidate usb_unbind_interface and usb_driver_release_interface X-Git-Tag: v2.6.31-rc1~304^2~118 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=91f8d063d30358fcb76831c238071f7d4b13c35e;p=linux.git USB: consolidate usb_unbind_interface and usb_driver_release_interface 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index d0a21a5f8201..c115eed0fdc3 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -385,7 +385,6 @@ void usb_driver_release_interface(struct usb_driver *driver, 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 usb_driver *driver, /* 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);