[PATCH 1/5] usb: gadget: Introduce usb_request->is_last field

[Thinh Nguyen <Thinh.Nguyen@synopsys.com>]

A transfer is composed of one or more usb_requests. Currently, only the
function driver knows this based on its implementation and its class
protocol. However, some usb controllers need to know this to update its
resources. For example, the DWC3 controller needs this info to update
its internal resources and initiate different streams.

Introduce a new field is_last to usb_request to inform the controller
driver whether the request is the last of its transfer.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
---
 include/linux/usb/gadget.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index e959c09a97c9..742c52f7e470 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -50,6 +50,7 @@ struct usb_ep;
  * @short_not_ok: When reading data, makes short packets be
  *     treated as errors (queue stops advancing till cleanup).
  * @dma_mapped: Indicates if request has been mapped to DMA (internal)
+ * @is_last: Indicates if this request is the last of a transfer.
  * @complete: Function called when request completes, so this request and
  *	its buffer may be re-used.  The function will always be called with
  *	interrupts disabled, and it must not sleep.
@@ -108,6 +109,7 @@ struct usb_request {
 	unsigned		zero:1;
 	unsigned		short_not_ok:1;
 	unsigned		dma_mapped:1;
+	unsigned		is_last:1;
 
 	void			(*complete)(struct usb_ep *ep,
 					struct usb_request *req);
-- 
2.11.0