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

From: Felipe Balbi
Date: Sat Apr 24 2021 - 04:10:14 EST


Marcel Hamer <marcel@xxxxxxxxxx> 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@xxxxxxxxxx>
> ---
> 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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