linux-kernel - Re: [PATCH] usb: dwc3: gadget: add missing wakeup link states

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Message-ID: <87pmykksuw.fsf@kernel.org>
Date:   Sat, 24 Apr 2021 11:08:07 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Marcel Hamer <marcel@...idxs.se>, linux-usb@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Marcel Hamer <marcel@...idxs.se>,
        Thinh Nguyen <thinhn@...opsys.com>
Subject: Re: [PATCH] usb: dwc3: gadget: add missing wakeup link states

Marcel Hamer <marcel@...idxs.se> writes:

> In dwc3_send_gadget_ep_cmd() a check is performed if the gadget needs
> waking up. The following condition is checked before calling the
> __dwc3_gadget_wakeup() function:
>
> 	needs_wakeup = (dwc->link_state == DWC3_LINK_STATE_U1 ||
>         		dwc->link_state == DWC3_LINK_STATE_U2 ||
>                         dwc->link_state == DWC3_LINK_STATE_U3);
>
> Inside __dwc3_gadget_wakeup() only link_state DWC3_LINK_STATE_U3 is checked
> and link state DWC3_LINK_STATE_U1 and DWC3_LINK_STATE_U2 are considered
> invalid and generate a warning because of the call to:
>
> 	dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n", ret);
>
> because of ret being -EINVAL.
>
> Signed-off-by: Marcel Hamer <marcel@...idxs.se>
> ---
>  drivers/usb/dwc3/gadget.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index c7ef218e7a8c..d05a7d630410 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -1972,6 +1972,8 @@ static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
>  	switch (link_state) {
>  	case DWC3_LINK_STATE_RESET:
>  	case DWC3_LINK_STATE_RX_DET:	/* in HS, means Early Suspend */
> +	case DWC3_LINK_STATE_U1:
> +	case DWC3_LINK_STATE_U2:

I think this was fixed recently by Thinh.

https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/commit/?h=usb-next&id=c560e76319a94a3b9285bc426c609903408e4826

-- 
balbi

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