usb: dwc3: gadget: add sg and num_pending_sgs to dwc3_request

These two fields will be used in a follow-up patch
to track how many entries of request's sglist we
have already processed. The reason is that if a
gadget driver sends an sglist with more entries then
we can fit in the ring, we will have to continue
processing remaining afterwards.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 45d6de5107c733ff1ba2d9df69e3147b45c9a493..1a6cc48fc7c417da39a6abe569dd9841512698a8 100644 (file)
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -685,6 +685,8 @@ struct dwc3_hwparams {
  * @request: struct usb_request to be transferred
  * @list: a list_head used for request queueing
  * @dep: struct dwc3_ep owning this request
+ * @sg: pointer to first incomplete sg
+ * @num_pending_sgs: counter to pending sgs
  * @first_trb_index: index to first trb used by this request
  * @epnum: endpoint number to which this request refers
  * @trb: pointer to struct dwc3_trb
@@ -697,7 +699,9 @@ struct dwc3_request {
        struct usb_request      request;
        struct list_head        list;
        struct dwc3_ep          *dep;
+       struct scatterlist      *sg;
 
+       unsigned                num_pending_sgs;
        u8                      first_trb_index;
        u8                      epnum;
        struct dwc3_trb         *trb;