[PATCH] usbcore dma updates (and doc)

Attached is a patch leveraging some of the new generic dma stuff:

- Replaces dma mapping calls in usbcore with generic equivalents.
   This is a minor code shrink (which we'd hoped could happen).

- Pass dma mask along, so net drivers can notice it'd be good to
   set NETIF_F_HIGHDMA; or scsi ones can set highmem_io.  (Some
   Intel EHCI setups are able to support this kind of DMA.)

- Updates one net driver (usbnet) to set NETIF_F_HIGHDMA when
   appropriate, mostly as an example (since I can't test this).

- Provides Documentation/usb/dma.txt, describing current APIs.
   (Unchanged by this patch, except dma mask visibility.)

- Converted another info() to dev_info(), and likewise a couple
   dbg() to dev_dbg() conversions in the modified routine.

The number of FIXMEs was conserved: the generic API doesn't yet
fix the error reporting bugs in the PCI-specific mapping API.

1 files changed, 7 insertions, 9 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 88557d5957a7..b1d92b8c585f 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -28,14 +28,6 @@ static __inline__ void wait_ms(unsigned int ms)
 		mdelay(ms);
 }
 
-/*
- * USB device number allocation bitmap. There's one bitmap
- * per USB tree.
- */
-struct usb_devmap {
-	unsigned long devicemap[128 / (8*sizeof(unsigned long))];
-};
-
 struct usb_device;
 
 /*-------------------------------------------------------------------------*/
@@ -159,10 +151,16 @@ int __usb_get_extra_descriptor(char *buffer, unsigned size,
 
 struct usb_operations;
 
+/* USB device number allocation bitmap */
+struct usb_devmap {
+	unsigned long devicemap[128 / (8*sizeof(unsigned long))];
+};
+
 /*
- * Allocated per bus we have
+ * Allocated per bus (tree of devices) we have:
  */
 struct usb_bus {
+	struct device *controller;	/* host/master side hardware */
 	int busnum;			/* Bus number (in order of reg) */
 	char *bus_name;			/* stable id (PCI slot_name etc) */