[U-Boot] [PATCH] usb: gadget: composite: Correct recovery path for register

[Marek Vasut <marex@denx.de>]

On 02/29/2016 11:11 AM, Lukasz Majewski wrote:
> Hi Marek,
> 
>> On 02/26/2016 08:43 PM, Sam Protsenko wrote:
>>> On Fri, Feb 19, 2016 at 9:34 PM, Sam Protsenko
>>> <semen.protsenko@linaro.org> wrote:
>>>> + Praneeth Bajjuri
>>>> + Tom Rini
>>>> + Rob Herring
>>>>
>>>> On Tue, Feb 16, 2016 at 7:59 PM, Semen Protsenko
>>>> <semen.protsenko@linaro.org> wrote:
>>>>> From: Sam Protsenko <semen.protsenko@linaro.org>
>>>>>
>>>>> In case when usb_composite_register() failed once (for whatever
>>>>> reason), it will fail further even if all conditions are correct.
>>>>> Example:
>>>>>
>>>>>     => fastboot 2
>>>>>     Invalid Controller Index
>>>>>     couldn't find an available UDC
>>>>>     g_dnl_register: failed!, error: -19
>>>>>     exit not allowed from main input shell.
>>>>>
>>>>>     => fastboot 0
>>>>>     g_dnl_register: failed!, error: -22
>>>>>     exit not allowed from main input shell.
>>>>>
>>>>> Despite that 0 is correct index for USB controller, "fastboot 0"
>>>>> command will fail, because "composite" structure wasn't cleared
>>>>> properly on previous fail (on "fastboot 2" command).
>>>>>
>>>>> This patch fixes that erroneous behavior, allowing us to use
>>>>> composite even after previous failure.
>>>>>
>>>>> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
>>>>> ---
>>>>>  drivers/usb/gadget/composite.c | 8 +++++++-
>>>>>  1 file changed, 7 insertions(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/drivers/usb/gadget/composite.c
>>>>> b/drivers/usb/gadget/composite.c index 60f9272..d0ee784 100644
>>>>> --- a/drivers/usb/gadget/composite.c
>>>>> +++ b/drivers/usb/gadget/composite.c
>>>>> @@ -1077,6 +1077,8 @@ static struct usb_gadget_driver
>>>>> composite_driver = { */
>>>>>  int usb_composite_register(struct usb_composite_driver *driver)
>>>>>  {
>>>>> +       int res;
>>>>> +
>>>>>         if (!driver || !driver->dev || !driver->bind || composite)
>>>>>                 return -EINVAL;
>>>>>
>>>>> @@ -1084,7 +1086,11 @@ int usb_composite_register(struct
>>>>> usb_composite_driver *driver) driver->name = "composite";
>>>>>         composite = driver;
>>>>>
>>>>> -       return usb_gadget_register_driver(&composite_driver);
>>>>> +       res = usb_gadget_register_driver(&composite_driver);
>>>>> +       if (res != 0)
>>>>> +               composite = NULL;
>>>>> +
>>>>> +       return res;
>>>>>  }
>>>>>
>>>>>  /**
>>>>> --
>>>>> 2.7.0
>>>>>
>>>
>>> bump
>>>
>>
>> Looks fine. Lukasz, shall I pick this myself ?
>>
>> btw if this isn't applied in a week, please ping me and I will pick it
>> nonetheless.
>>
> 
> I will add this to my tree. And test it afterwards. 
> 
> I will send new PR with some other patches.
> 

Roger, thanks!

-- 
Best regards,
Marek Vasut