Re: [PATCH v2 2/2] usb: gadget: loopback: Fix looping back logic implementation

[Krzysztof Opasiak <k.opasiak@samsung.com>]

On 09/22/2015 06:56 PM, Krzysztof Opasiak wrote:
> Since:
>
> commit e0857ce58e8658657f5f12fe25272b93cfeb16aa
> ("usb: gadget: loopback: don't queue requests to bogus endpoints")
>
> Loopback function is not realy working as that commit removed
> all looping back logic. After that commit ep-out works like
> /dev/null and ep-in works like /dev/zero.
>
> This commit fix this issue by allocating set of out requests
> and set of in requests but each out req shares buffer with
> one in req:
>
> out_req->buf ---> buf <--- in_req.buf
> out_req->context <---> in_req.context
>
> The completion routine simply  enqueue the suitable req in
> an oposite direction.
>
> Cc: <stable@vger.kernel.org> # 3.18+
> Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
> ---
> Changes since v1:
> - add missing usb_ep_free_request() in complete() callback

After hour of using this I have faced some problem with memory feeing. I 
will look for it and send update shortly.

-- 
Krzysztof Opasiak
Samsung R&D Institute Poland
Samsung Electronics