usb: dwc2: dwc2_vbus_supply_init: fix error check

[Heiko Stuebner <heiko@sntech.de>]

Hi Tomeu,

Am Donnerstag, 22. März 2018, 12:39:13 CET schrieb Heiko Stübner:
> Am Donnerstag, 22. März 2018, 10:39:43 CET schrieb Tomeu Vizoso:
> > devm_regulator_get_optional returns -ENODEV if the regulator isn't
> > there, so if that's the case we have to make sure not to leave -ENODEV
> > in the regulator pointer.
> > 
> > Also, make sure we return 0 in that case, but correctly propagate any
> > other errors. Also propagate the error from _dwc2_hcd_start.
> > 
> > Fixes: 531ef5ebea96 ("usb: dwc2: add support for host mode external vbus
> > supply") Cc: Amelie Delaunay <amelie.delaunay@st.com>
> > Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
> 
> Thanks for catching that oops in your tests.
> Reviewed-by: Heiko Stuebner <heiko@sntech.de>

I take that back :-)
see below

> > ---
> > 
> >  drivers/usb/dwc2/hcd.c | 13 ++++++++-----
> >  1 file changed, 8 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
> > index dcfda5eb4cac..4ae211f65e85 100644
> > --- a/drivers/usb/dwc2/hcd.c
> > +++ b/drivers/usb/dwc2/hcd.c
> > @@ -359,8 +359,13 @@ static void dwc2_gusbcfg_init(struct dwc2_hsotg
> > *hsotg) static int dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg)
> > 
> >  {
> >  
> >  	hsotg->vbus_supply = devm_regulator_get_optional(hsotg->dev, "vbus");
> > 
> > -	if (IS_ERR(hsotg->vbus_supply))
> > -		return 0;
> > +	if (IS_ERR(hsotg->vbus_supply)) {
> > +		hsotg->vbus_supply = NULL;
> > +		if (PTR_ERR(hsotg->vbus_supply) == -ENODEV)

hsotg->vbus_supply is already NULL here
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