USB: add direction bit to urb->transfer_flags
This patch (as945) adds a bit to urb->transfer_flags for recording the
direction of the URB. The bit is set/cleared automatically in
usb_submit_urb() so drivers don't have to worry about it (although as
a result, it isn't valid until the URB has been submitted). Inline
routines are added for easily checking an URB's direction. They
replace calls to usb_pipein in the DMA-mapping parts of hcd.c.
For non-control endpoints, the direction is determined directly from
the endpoint descriptor. However control endpoints are
bi-directional; for them the direction is determined from the
bRequestType byte and the wLength value in the setup packet.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index ff53acb..1a64a6a 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -309,7 +309,21 @@
* and don't need to duplicate tests
*/
xfertype = usb_endpoint_type(&ep->desc);
- is_out = usb_pipeout(urb->pipe);
+ if (xfertype == USB_ENDPOINT_XFER_CONTROL) {
+ struct usb_ctrlrequest *setup =
+ (struct usb_ctrlrequest *) urb->setup_packet;
+
+ if (!setup)
+ return -ENOEXEC;
+ is_out = !(setup->bRequestType & USB_DIR_IN) ||
+ !setup->wLength;
+ } else {
+ is_out = usb_endpoint_dir_out(&ep->desc);
+ }
+
+ /* Cache the direction for later use */
+ urb->transfer_flags = (urb->transfer_flags & ~URB_DIR_MASK) |
+ (is_out ? URB_DIR_OUT : URB_DIR_IN);
if (xfertype != USB_ENDPOINT_XFER_CONTROL &&
dev->state < USB_STATE_CONFIGURED)
@@ -363,7 +377,7 @@
/* enforce simple/standard policy */
allowed = (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP |
- URB_NO_INTERRUPT);
+ URB_NO_INTERRUPT | URB_DIR_MASK);
switch (xfertype) {
case USB_ENDPOINT_XFER_BULK:
if (is_out)
