linux-kernel - Re: [PATCH] usb: cdnsp: Fix issue with Clear Feature Halt Endpoint

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Message-ID: <CAL411-qwmC8xuZUtrrVjtiiyaD-aLamO6GJAeMbLd1X73UDSmQ@mail.gmail.com>
Date:   Wed, 9 Nov 2022 22:43:06 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     peter.chen@...nel.org, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] usb: cdnsp: Fix issue with Clear Feature Halt Endpoint

On Wed, Oct 26, 2022 at 5:37 PM Pawel Laszczak <pawell@...ence.com> wrote:
>
> During handling Clear Halt Endpoint Feature request driver invokes

Add "," between request and driver. Otherwise, it is okay for me.

Reviewed-by: Peter Chen <peter.chen@...nel.org>

Peter

> Reset Endpoint command. Because this command has some issue with
> transition endpoint from Running to Idle state the driver must
> stop the endpoint by using Stop Endpoint command.
>
> cc: <stable@...r.kernel.org>
> Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> ---
>  drivers/usb/cdns3/cdnsp-gadget.c | 12 ++++--------
>  drivers/usb/cdns3/cdnsp-ring.c   |  3 ++-
>  2 files changed, 6 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/usb/cdns3/cdnsp-gadget.c b/drivers/usb/cdns3/cdnsp-gadget.c
> index e2e7d16f43f4..0576f9b0e4aa 100644
> --- a/drivers/usb/cdns3/cdnsp-gadget.c
> +++ b/drivers/usb/cdns3/cdnsp-gadget.c
> @@ -600,11 +600,11 @@ int cdnsp_halt_endpoint(struct cdnsp_device *pdev,
>
>         trace_cdnsp_ep_halt(value ? "Set" : "Clear");
>
> -       if (value) {
> -               ret = cdnsp_cmd_stop_ep(pdev, pep);
> -               if (ret)
> -                       return ret;
> +       ret = cdnsp_cmd_stop_ep(pdev, pep);
> +       if (ret)
> +               return ret;
>
> +       if (value) {
>                 if (GET_EP_CTX_STATE(pep->out_ctx) == EP_STATE_STOPPED) {
>                         cdnsp_queue_halt_endpoint(pdev, pep->idx);
>                         cdnsp_ring_cmd_db(pdev);
> @@ -613,10 +613,6 @@ int cdnsp_halt_endpoint(struct cdnsp_device *pdev,
>
>                 pep->ep_state |= EP_HALTED;
>         } else {
> -               /*
> -                * In device mode driver can call reset endpoint command
> -                * from any endpoint state.
> -                */
>                 cdnsp_queue_reset_ep(pdev, pep->idx);
>                 cdnsp_ring_cmd_db(pdev);
>                 ret = cdnsp_wait_for_cmd_compl(pdev);
> diff --git a/drivers/usb/cdns3/cdnsp-ring.c b/drivers/usb/cdns3/cdnsp-ring.c
> index 25e5e51cf5a2..aa79bce89d8a 100644
> --- a/drivers/usb/cdns3/cdnsp-ring.c
> +++ b/drivers/usb/cdns3/cdnsp-ring.c
> @@ -2081,7 +2081,8 @@ int cdnsp_cmd_stop_ep(struct cdnsp_device *pdev, struct cdnsp_ep *pep)
>         u32 ep_state = GET_EP_CTX_STATE(pep->out_ctx);
>         int ret = 0;
>
> -       if (ep_state == EP_STATE_STOPPED || ep_state == EP_STATE_DISABLED) {
> +       if (ep_state == EP_STATE_STOPPED || ep_state == EP_STATE_DISABLED ||
> +           ep_state == EP_STATE_HALTED) {
>                 trace_cdnsp_ep_stopped_or_disabled(pep->out_ctx);
>                 goto ep_stopped;
>         }
> --
> 2.25.1
>