[U-Boot] [PATCH] usb: gadget: ci_udc: implement usb_ep_ops dequeue callback

[Peng Fan <b51431@freescale.com>]

Hi Marek,
On Thu, Aug 27, 2015 at 01:08:46PM +0200, Marek Vasut wrote:
>On Thursday, August 27, 2015 at 01:00:50 PM, Peng Fan wrote:
>> Implement endpoint dequeue callback function.
>> 
>> Without this function, uboot will hang when executing fastboot comamnd.
>> See following flow:
>> "fastboot_tx_write_str->fastboot_tx_write->usb_ep_dequeue->ep->ops->dequeue
>> " without implement ci_udc dequeue function, ep->ops->dequeue is NULL, then
>> uboot will hang.
>> 
>> Tested on mx6qsabresd board with fastboot enabled.
>> 
>> Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
>> Cc: "?ukasz Majewski" <l.majewski@samsung.com>
>> Cc: Marek Vasut <marex@denx.de>
>> ---
>>  drivers/usb/gadget/ci_udc.c | 28 ++++++++++++++++++++++++++++
>>  1 file changed, 28 insertions(+)
>> 
>> diff --git a/drivers/usb/gadget/ci_udc.c b/drivers/usb/gadget/ci_udc.c
>> index 3e8eb87..f9374b3 100644
>> --- a/drivers/usb/gadget/ci_udc.c
>> +++ b/drivers/usb/gadget/ci_udc.c
>> @@ -87,6 +87,7 @@ static int ci_ep_enable(struct usb_ep *ep,
>>  static int ci_ep_disable(struct usb_ep *ep);
>>  static int ci_ep_queue(struct usb_ep *ep,
>>  		struct usb_request *req, gfp_t gfp_flags);
>> +static int ci_ep_dequeue(struct usb_ep *ep, struct usb_request *req);
>>  static struct usb_request *
>>  ci_ep_alloc_request(struct usb_ep *ep, unsigned int gfp_flags);
>>  static void ci_ep_free_request(struct usb_ep *ep, struct usb_request
>> *_req); @@ -99,6 +100,7 @@ static struct usb_ep_ops ci_ep_ops = {
>>  	.enable         = ci_ep_enable,
>>  	.disable        = ci_ep_disable,
>>  	.queue          = ci_ep_queue,
>> +	.dequeue	= ci_ep_dequeue,
>>  	.alloc_request  = ci_ep_alloc_request,
>>  	.free_request   = ci_ep_free_request,
>>  };
>> @@ -525,6 +527,32 @@ static void ci_ep_submit_next_request(struct ci_ep
>> *ci_ep) writel(bit, &udc->epprime);
>>  }
>> 
>> +static int ci_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
>> +{
>> +	struct ci_ep *ci_ep = container_of(_ep, struct ci_ep, ep);
>> +	struct ci_req *ci_req;
>> +
>> +	list_for_each_entry(ci_req, &ci_ep->queue, queue) {
>> +		if (&ci_req->req == _req)
>> +			break;
>> +	}
>> +
>> +	if (&ci_req->req != _req)
>> +		return -EINVAL;
>> +
>> +	list_del_init(&ci_req->queue);
>> +
>> +	if (ci_req->req.status == -EINPROGRESS) {
>> +		ci_req->req.status = -ECONNRESET;
>> +		if (ci_req->req.complete)
>> +			ci_req->req.complete(_ep, _req);
>> +	}
>> +
>> +	debug("callback completed\n");
>
>Please fix this useless debug() statement, either remove it, or at least
>make it print __func__ so one can identify where this came from.

Will remove it and send out v2 with your Reviewed-by Tag.

>
>
>Looks good otherwise:
>
>Reviewed-by: Marek Vasut <marex@denx.de>

Thanks,
Peng.
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