Hi Thinh, On Mon, Feb 14, 2022 at 06:44:33PM +0000, Thinh Nguyen wrote: > Hi, > > Daehwan Jung wrote: > > It always sets DWC3_EP_END_TRANSFER_PENDING in dwc3_stop_active_transfer > > even if dwc3_send_gadget_ep_cmd fails. It can cause some problems like > > How does it fail? Timed out? Yes, timed out. > > > skipping clear stall commmand or giveback from dequeue. We fix to set it > > only when ep cmd success. Additionally, We clear DWC3_EP_TRANSFER_STARTED > > for next trb to start transfer not update transfer. > > We shouldn't do this. Things will be out of sync. It may work for 1 > scenario, but it won't work for others. > > Please help me understand a few things: > > 1) What is the scenario that triggers this? Is it random? > ep cmd timeout occurs on dequeue request from user side. End Transfer command would be sent in dwc3_stop_active transfer. > 2) Are there other traffics pending while issuing the End Transfer > command? If so, what transfer type(s)? > I haven't checked it yet. > 3) Have you tried increasing the timeout? > No, I haven't. > BR, > Thinh > This issue occurs very rarely on customer. I only have restricted information. That's why I've been trying to reproduce it. Wesley may have run into same issue and you can see this issue in detail. https://protect2.fireeye.com/v1/url?k=9d423b69-fc3fd32e-9d43b026-74fe485fff30-77a099b52659410d&q=1&e=20b4d9f5-2599-4f57-8b6a-7c4ec167d228&u=https%3A%2F%2Flore.kernel.org%2Flinux-usb%2F20220203080017.27339-1-quic_wcheng%40quicinc.com%2F Best Regards, Jung Daehwan > > > > > Signed-off-by: Daehwan Jung <dh10.jung@xxxxxxxxxxx> > > --- > > drivers/usb/dwc3/gadget.c | 8 +++++++- > > 1 file changed, 7 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c > > index 183b90923f51..3ad3bc5813ca 100644 > > --- a/drivers/usb/dwc3/gadget.c > > +++ b/drivers/usb/dwc3/gadget.c > > @@ -2044,6 +2044,12 @@ static int dwc3_gadget_ep_dequeue(struct usb_ep *ep, > > dwc3_gadget_move_cancelled_request(r, > > DWC3_REQUEST_STATUS_DEQUEUED); > > > > + /* If ep cmd fails, then force to giveback cancelled requests here */ > > + if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING)) { > > + dep->flags &= ~DWC3_EP_TRANSFER_STARTED; > > + dwc3_gadget_ep_cleanup_cancelled_requests(dep); > > + } > > + > > dep->flags &= ~DWC3_EP_WAIT_TRANSFER_COMPLETE; > > > > goto out; > > @@ -3645,7 +3651,7 @@ static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force, > > > > if (!interrupt) > > dep->flags &= ~DWC3_EP_TRANSFER_STARTED; > > - else > > + else if (!ret) > > dep->flags |= DWC3_EP_END_TRANSFER_PENDING; > > } > > >
