linux-kernel - Re: [RESEND PATCH v3 1/2] usb: dwc3: gadget: Add disconnect checking when changing function dynamically

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Message-ID: <87oa2ovicc.fsf@linux.intel.com>
Date:   Thu, 13 Oct 2016 10:06:11 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     gregkh@...uxfoundation.org, broonie@...nel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        baolin.wang@...aro.org
Subject: Re: [RESEND PATCH v3 1/2] usb: dwc3: gadget: Add disconnect checking when changing function dynamically


Hi,

Baolin Wang <baolin.wang@...aro.org> writes:
> When system has stpped the gadget, we should avoid queuing any requests

queueing is *not* a problem. Starting is. In fact, that's what your
patch is doing.

> which will cause tranfer failed. Thus adding some disconnect checking to
                   ^^^^^^^
                   transfer

> avoid this situation.
>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
> Changes since v2:
>  - Move disconnect checking into dwc3_send_gadget_ep_cmd().
>  - Rename completion name and issue complete() at one place.
>  - Move completion initialization into dwc3_gadget_init().
>
> Changes since v1:
>  - Split into 2 separate ptaches.
>  - Choose complete mechanism instead of polling.
> ---
>  drivers/usb/dwc3/gadget.c |    3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 1783406..ca2ae5b 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -241,6 +241,9 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
>  	int			susphy = false;
>  	int			ret = -EINVAL;
>  
> +	if (!dwc->pullups_connected)
> +		return -ESHUTDOWN;
> +
>  	/*
>  	 * Synopsys Databook 2.60a states, on section 6.3.2.5.[1-8], that if
>  	 * we're issuing an endpoint command, we must check if
> -- 
> 1.7.9.5
>
> --
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-- 
balbi

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