USB: remove the URB_NO_FSBR flag

The URB_NO_FSBR flag has never really been used.  It was introduced as
a potential way for UHCI to minimize PCI bus usage (by not attempting
full-speed bulk and control transfers more than once per frame), but
the flag was not set by any drivers.

There's no point in keeping it around.  This patch simplifies the API
by removing it.  Unfortunately, it does have to be kept as part of the
usbfs ABI, but at least we can document in
include/uapi/linux/usbdevice_fs.h that it doesn't do anything.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/usb/usbip_protocol.txt

@@ -274,7 +274,6 @@ USBIP_CMD_SUBMIT: Submit an URB
   URB_SHORT_NOT_OK        | 0x00000001 | only in | only in   | only in  | no
   URB_ISO_ASAP            | 0x00000002 | no      | no        | no       | yes
   URB_NO_TRANSFER_DMA_MAP | 0x00000004 | yes     | yes       | yes      | yes
-  URB_NO_FSBR             | 0x00000020 | yes     | no        | no       | no
   URB_ZERO_PACKET         | 0x00000040 | no      | no        | only out | no
   URB_NO_INTERRUPT        | 0x00000080 | yes     | yes       | yes      | yes
   URB_FREE_BUFFER         | 0x00000100 | yes     | yes       | yes      | yes

drivers/usb/core/devio.c

@@ -1677,8 +1677,6 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
 		u |= URB_ISO_ASAP;
 	if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
 		u |= URB_SHORT_NOT_OK;
-	if (uurb->flags & USBDEVFS_URB_NO_FSBR)
-		u |= URB_NO_FSBR;
 	if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
 		u |= URB_ZERO_PACKET;
 	if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)

drivers/usb/core/urb.c

@@ -479,9 +479,6 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 		if (is_out)
 			allowed |= URB_ZERO_PACKET;
 		/* FALLTHROUGH */
-	case USB_ENDPOINT_XFER_CONTROL:
-		allowed |= URB_NO_FSBR;	/* only affects UHCI */
-		/* FALLTHROUGH */
 	default:			/* all non-iso endpoints */
 		if (!is_out)
 			allowed |= URB_SHORT_NOT_OK;

drivers/usb/host/uhci-q.c

@@ -73,8 +73,7 @@ static void uhci_add_fsbr(struct uhci_hcd *uhci, struct urb *urb)
 {
 	struct urb_priv *urbp = urb->hcpriv;
 
-	if (!(urb->transfer_flags & URB_NO_FSBR))
-		urbp->fsbr = 1;
+	urbp->fsbr = 1;
 }
 
 static void uhci_urbp_wants_fsbr(struct uhci_hcd *uhci, struct urb_priv *urbp)

drivers/usb/usbip/stub_rx.c

@@ -412,9 +412,6 @@ static void masking_bogus_flags(struct urb *urb)
 		if (is_out)
 			allowed |= URB_ZERO_PACKET;
 		/* FALLTHROUGH */
-	case USB_ENDPOINT_XFER_CONTROL:
-		allowed |= URB_NO_FSBR;	/* only affects UHCI */
-		/* FALLTHROUGH */
 	default:			/* all non-iso endpoints */
 		if (!is_out)
 			allowed |= URB_SHORT_NOT_OK;

include/linux/usb.h

@@ -1293,7 +1293,6 @@ extern int usb_disabled(void);
 #define URB_ISO_ASAP		0x0002	/* iso-only; use the first unexpired
 					 * slot in the schedule */
 #define URB_NO_TRANSFER_DMA_MAP	0x0004	/* urb->transfer_dma valid on submit */
-#define URB_NO_FSBR		0x0020	/* UHCI-specific */
 #define URB_ZERO_PACKET		0x0040	/* Finish bulk OUT with short packet */
 #define URB_NO_INTERRUPT	0x0080	/* HINT: no non-error interrupt
 					 * needed */

include/uapi/linux/usbdevice_fs.h

@@ -79,7 +79,7 @@ struct usbdevfs_connectinfo {
 #define USBDEVFS_URB_SHORT_NOT_OK	0x01
 #define USBDEVFS_URB_ISO_ASAP		0x02
 #define USBDEVFS_URB_BULK_CONTINUATION	0x04
-#define USBDEVFS_URB_NO_FSBR		0x20
+#define USBDEVFS_URB_NO_FSBR		0x20	/* Not used */
 #define USBDEVFS_URB_ZERO_PACKET	0x40
 #define USBDEVFS_URB_NO_INTERRUPT	0x80