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

From: Baolin Wang
Date: Thu Oct 13 2016 - 03:45:51 EST


Hi,

On 13 October 2016 at 15:06, Felipe Balbi <balbi@xxxxxxxxxx> wrote:
>
> Hi,
>
> Baolin Wang <baolin.wang@xxxxxxxxxx> 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@xxxxxxxxxx>
>> ---
>> 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