USB: remove struct usb_operations

All of the currently-supported USB host controller drivers use the HCD
bus-glue framework.  As part of the program for flattening out the glue
layer, this patch (as769) removes the usb_operations structure.  All
function calls now go directly to the HCD routines (slightly renamed
to remain within the "usb_" namespace).

The patch also removes usb_alloc_bus(), because it's not useful in the
HCD framework and it wasn't referenced anywhere.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 4eb98eb..7ab9d29 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -480,7 +480,7 @@
  */
 int usb_get_current_frame_number(struct usb_device *dev)
 {
-	return dev->bus->op->get_frame_number (dev);
+	return usb_hcd_get_frame_number (dev);
 }
 
 /**
@@ -677,9 +677,9 @@
 	dma_addr_t *dma
 )
 {
-	if (!dev || !dev->bus || !dev->bus->op || !dev->bus->op->buffer_alloc)
+	if (!dev || !dev->bus)
 		return NULL;
-	return dev->bus->op->buffer_alloc (dev->bus, size, mem_flags, dma);
+	return hcd_buffer_alloc (dev->bus, size, mem_flags, dma);
 }
 
 /**
@@ -700,11 +700,11 @@
 	dma_addr_t dma
 )
 {
-	if (!dev || !dev->bus || !dev->bus->op || !dev->bus->op->buffer_free)
+	if (!dev || !dev->bus)
 		return;
 	if (!addr)
 		return;
-	dev->bus->op->buffer_free (dev->bus, size, addr, dma);
+	hcd_buffer_free (dev->bus, size, addr, dma);
 }
 
 /**