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

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Message-ID: <CAMz4kuLySR8ehbdYHUjXeWCdPY3bteYFt1gdFi_EQmxOi=-aEg@mail.gmail.com>
Date:   Thu, 13 Oct 2016 15:37:33 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Mark Brown <broonie@...nel.org>,
        USB <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH v3 1/2] usb: dwc3: gadget: Add disconnect checking
 when changing function dynamically

Hi,

On 13 October 2016 at 15:06, Felipe Balbi <balbi@...nel.org> wrote:
>
> 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.

OK.

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

Sorry for spelling mistake, will fix it.

>
>> 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



-- 
Baolin.wang
Best Regards