From: Jung Daehwan <dh10.jung@samsung.com>
To: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Cc: Felipe Balbi <balbi@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>,
"quic_wcheng@quicinc.com" <quic_wcheng@quicinc.com>,
"quic_jackp@quicinc.com" <quic_jackp@quicinc.com>
Subject: Re: [PATCH v2 1/2] usb: dwc3: Not set DWC3_EP_END_TRANSFER_PENDING in ep cmd fails
Date: Tue, 15 Feb 2022 15:39:25 +0900 [thread overview]
Message-ID: <20220215063925.GC144890@ubuntu> (raw)
In-Reply-To: <ff604504-00df-0c1b-673e-892e42737f7a@synopsys.com>
[-- Attachment #1: Type: text/plain, Size: 2701 bytes --]
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@samsung.com>
> > ---
> > 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;
> > }
> >
>
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next prev parent reply other threads:[~2022-02-15 6:41 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20220214111148epcas2p3fac143c7870c53ecadfb6b093fcf626b@epcas2p3.samsung.com>
2022-02-14 11:08 ` [PATCH v2 0/2] Fix ep command fail issue in dequeue Daehwan Jung
[not found] ` <CGME20220214111149epcas2p1a1faeda037991885fd6f2f026fa44ec5@epcas2p1.samsung.com>
2022-02-14 11:08 ` [PATCH v2 1/2] usb: dwc3: Not set DWC3_EP_END_TRANSFER_PENDING in ep cmd fails Daehwan Jung
2022-02-14 11:29 ` Greg Kroah-Hartman
2022-02-15 6:58 ` Jung Daehwan
2022-02-15 7:37 ` Greg Kroah-Hartman
2022-02-15 8:20 ` Jung Daehwan
2022-02-14 18:44 ` Thinh Nguyen
2022-02-15 6:39 ` Jung Daehwan [this message]
2022-02-15 17:14 ` Thinh Nguyen
2022-02-17 20:05 ` Wesley Cheng
2022-02-17 23:43 ` Thinh Nguyen
2022-02-22 18:08 ` Wesley Cheng
2022-02-23 2:59 ` Thinh Nguyen
2022-02-24 21:45 ` Wesley Cheng
2022-02-25 1:26 ` Thinh Nguyen
2022-02-25 1:31 ` Wesley Cheng
2022-02-25 1:44 ` Thinh Nguyen
2022-02-28 22:53 ` Wesley Cheng
2022-03-01 1:09 ` Thinh Nguyen
2022-03-01 2:09 ` Wesley Cheng
2022-03-01 3:02 ` Thinh Nguyen
2022-03-04 21:58 ` Wesley Cheng
2022-03-05 0:53 ` Thinh Nguyen
2022-03-07 22:57 ` Wesley Cheng
2022-03-07 23:51 ` Thinh Nguyen
2022-03-08 19:20 ` Wesley Cheng
2022-02-18 4:44 ` Jung Daehwan
2022-02-23 2:11 ` Thinh Nguyen
[not found] ` <CGME20220214111149epcas2p29b9e39b84d7203572422531beb3c39ed@epcas2p2.samsung.com>
2022-02-14 11:08 ` [PATCH v2 2/2] usb: dwc3: Prevent cleanup cancelled requests at the same time Daehwan Jung
2022-02-14 11:30 ` Greg Kroah-Hartman
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