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

[Lukasz Majewski <l.majewski@samsung.com>]

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.

-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group