usb: core: Remove unused usb_unlink_anchored_urbs

usb_unlink_anchored_urbs() has been unused since it's last use was
removed in 2009 by
commit 9b9c5aaeedfd ("ar9170: xmit code revamp")

Remove it.

Signed-off-by: "Dr. David Alan Gilbert" <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/driver-api/usb/anchors.rst

···
 are called in the reverse temporal order they were submitted.
 This way no data can be reordered.
 
-:c:func:`usb_unlink_anchored_urbs`
-----------------------------------
-
-
-This function unlinks all URBs associated with an anchor. The URBs
-are processed in the reverse temporal order they were submitted.
-This is similar to :c:func:`usb_kill_anchored_urbs`, but it will not sleep.
-Therefore no guarantee is made that the URBs have been unlinked when
-the call returns. They may be unlinked later but will be unlinked in
-finite time.
-
 :c:func:`usb_scuttle_anchored_urbs`
 -----------------------------------
 

drivers/usb/core/urb.c

···
  * code).
  *
  * Drivers should not call this routine or related routines, such as
- * usb_kill_urb() or usb_unlink_anchored_urbs(), after their disconnect
- * method has returned.  The disconnect function should synchronize with
- * a driver's I/O routines to insure that all URB-related activity has
- * completed before it returns.
+ * usb_kill_urb(), after their disconnect method has returned. The
+ * disconnect function should synchronize with a driver's I/O routines
+ * to insure that all URB-related activity has completed before it returns.
  *
  * This request is asynchronous, however the HCD might call the ->complete()
  * callback during unlink. Therefore when drivers call usb_unlink_urb(), they
···
 	spin_unlock_irqrestore(&anchor->lock, flags);
 }
 EXPORT_SYMBOL_GPL(usb_unpoison_anchored_urbs);
-/**
- * usb_unlink_anchored_urbs - asynchronously cancel transfer requests en masse
- * @anchor: anchor the requests are bound to
- *
- * this allows all outstanding URBs to be unlinked starting
- * from the back of the queue. This function is asynchronous.
- * The unlinking is just triggered. It may happen after this
- * function has returned.
- *
- * This routine should not be called by a driver after its disconnect
- * method has returned.
- */
-void usb_unlink_anchored_urbs(struct usb_anchor *anchor)
-{
-	struct urb *victim;
-
-	while ((victim = usb_get_from_anchor(anchor)) != NULL) {
-		usb_unlink_urb(victim);
-		usb_put_urb(victim);
-	}
-}
-EXPORT_SYMBOL_GPL(usb_unlink_anchored_urbs);
 
 /**
  * usb_anchor_suspend_wakeups

include/linux/usb.h

···
 extern void usb_kill_anchored_urbs(struct usb_anchor *anchor);
 extern void usb_poison_anchored_urbs(struct usb_anchor *anchor);
 extern void usb_unpoison_anchored_urbs(struct usb_anchor *anchor);
-extern void usb_unlink_anchored_urbs(struct usb_anchor *anchor);
 extern void usb_anchor_suspend_wakeups(struct usb_anchor *anchor);
 extern void usb_anchor_resume_wakeups(struct usb_anchor *anchor);
 extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor);