diff mbox series

[v2] usb: cdnsp: Fix wrong transmission direction of EP0

Message ID 20221101044433.5627-1-3090101217@zju.edu.cn
State New
Headers show
Series [v2] usb: cdnsp: Fix wrong transmission direction of EP0 | expand

Commit Message

Jing Leng Nov. 1, 2022, 4:44 a.m. UTC 
EP0 transfer is bi-directional, but in the cdnsp gadget, the
transmission direction of EP0 is not changed after it is
initialized to IN, so the OUT data from EP0 received by the host
is invalid.

The value of ep0_expect_in will change according to the value of
bRequestType in the SETUP transaction of control transfer, so we
can use it as the transmission direction of EP0.

Signed-off-by: Jing Leng <3090101217@zju.edu.cn>
Signed-off-by: Jing Leng <jleng@ambarella.com>
---
ChangeLog v1->v2:
- Rebase the patch.
- Make email addresses ('From' and 'Signed-off-by') consistent.
---
 drivers/usb/cdns3/cdnsp-gadget.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/cdns3/cdnsp-gadget.c b/drivers/usb/cdns3/cdnsp-gadget.c
index c67715f6f756..526f80651d35 100644
--- a/drivers/usb/cdns3/cdnsp-gadget.c
+++ b/drivers/usb/cdns3/cdnsp-gadget.c
@@ -345,6 +345,7 @@  int cdnsp_ep_enqueue(struct cdnsp_ep *pep, struct cdnsp_request *preq)
 {
 	struct cdnsp_device *pdev = pep->pdev;
 	struct usb_request *request;
+	u8 direction;
 	int ret;
 
 	if (preq->epnum == 0 && !list_empty(&pep->pending_list)) {
@@ -355,11 +356,14 @@  int cdnsp_ep_enqueue(struct cdnsp_ep *pep, struct cdnsp_request *preq)
 	request = &preq->request;
 	request->actual = 0;
 	request->status = -EINPROGRESS;
-	preq->direction = pep->direction;
+
+	direction = usb_endpoint_xfer_control(pep->endpoint.desc) ?
+		    pdev->ep0_expect_in : pep->direction;
+	preq->direction = direction;
 	preq->epnum = pep->number;
 	preq->td.drbl = 0;
 
-	ret = usb_gadget_map_request_by_dev(pdev->dev, request, pep->direction);
+	ret = usb_gadget_map_request_by_dev(pdev->dev, request, direction);
 	if (ret) {
 		trace_cdnsp_request_enqueue_error(preq);
 		return ret;
@@ -387,8 +391,7 @@  int cdnsp_ep_enqueue(struct cdnsp_ep *pep, struct cdnsp_request *preq)
 	return 0;
 
 unmap:
-	usb_gadget_unmap_request_by_dev(pdev->dev, &preq->request,
-					pep->direction);
+	usb_gadget_unmap_request_by_dev(pdev->dev, &preq->request, direction);
 	list_del(&preq->list);
 	trace_cdnsp_request_enqueue_error(preq);