usb: dwc3: gadget: Resume pending requests after CLEAR_STALL

The function driver may queue new requests right after halting the
endpoint (i.e. queue new requests while the endpoint is stalled).
There's no restriction preventing it from doing so. However, dwc3
currently drops those requests after CLEAR_STALL. The driver should only
drop started requests. Keep the pending requests in the pending list to
resume and process them after the host issues ClearFeature(Halt) to the
endpoint.

Cc: stable@vger.kernel.org
Fixes: cb11ea56f37a ("usb: dwc3: gadget: Properly handle ClearFeature(halt)")
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index c2a0f64f8d1e12e7b949ae8b6978a3a02aee5338..c04f7b29535ef0d92ae3ec518bbd5025dfa025bb 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1628,8 +1628,13 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
        if (dep->flags & DWC3_EP_WAIT_TRANSFER_COMPLETE)
                return 0;
 
-       /* Start the transfer only after the END_TRANSFER is completed */
-       if (dep->flags & DWC3_EP_END_TRANSFER_PENDING) {
+       /*
+        * Start the transfer only after the END_TRANSFER is completed
+        * and endpoint STALL is cleared.
+        */
+       if ((dep->flags & DWC3_EP_END_TRANSFER_PENDING) ||
+           (dep->flags & DWC3_EP_WEDGE) ||
+           (dep->flags & DWC3_EP_STALL)) {
                dep->flags |= DWC3_EP_DELAY_START;
                return 0;
        }
@@ -1836,13 +1841,14 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
                list_for_each_entry_safe(req, tmp, &dep->started_list, list)
                        dwc3_gadget_move_cancelled_request(req);
 
-               list_for_each_entry_safe(req, tmp, &dep->pending_list, list)
-                       dwc3_gadget_move_cancelled_request(req);
-
-               if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING)) {
-                       dep->flags &= ~DWC3_EP_DELAY_START;
+               if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
                        dwc3_gadget_ep_cleanup_cancelled_requests(dep);
-               }
+
+               if ((dep->flags & DWC3_EP_DELAY_START) &&
+                   !usb_endpoint_xfer_isoc(dep->endpoint.desc))
+                       __dwc3_gadget_kick_transfer(dep);
+
+               dep->flags &= ~DWC3_EP_DELAY_START;
        }
 
        return ret;