Am Donnerstag, 22. März 2018, 14:14:51 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.delau...@st.com>
> Signed-off-by: Tomeu Vizoso <tomeu.viz...@collabora.com>
>
> ---
>
> v2: Only overwrite the error in the pointer after checking it (Heiko
> Stübner <he...@sntech.de>)
> v3: Remove hunks that shouldn't be in this patch
> ---
> drivers/usb/dwc2/hcd.c | 11 +++++++----
> 1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
> index dcfda5eb4cac..863aed20517f 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))
> + if (PTR_ERR(hsotg->vbus_supply) == -ENODEV) {
> + hsotg->vbus_supply = NULL;
> return 0;
> + } else if (IS_ERR(hsotg->vbus_supply)) {
> + hsotg->vbus_supply = NULL;
> + return PTR_ERR(hsotg->vbus_supply);
> + }
my personal cluelessnes, but can you use PTR_ERR without checking for
IS_ERR first?
I would've expected something along the line of
if (IS_ERR(hsotg->vbus_supply)) {
if (PTR_ERR(hsotg->vbus_supply) == -ENODEV) {
hsotg->vbus_supply = NULL;
return 0;
} else {
return PTR_ERR(hsotg->vbus_supply);
}
}
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