Hi Simon-san,
> From: Simon Horman, Sent: Monday, April 9, 2018 8:58 PM
>
> On Mon, Apr 02, 2018 at 09:21:34PM +0900, Yoshihiro Shimoda wrote:
> > This patch fixes an issue that this driver cannot call phy_init()
> > if a gadget driver is alreadly loaded because usb_add_gadget_udc()
> > might call renesas_usb3_start() via .udc_start.
> >
> > Fixes: 279d4bc64060 ("usb: gadget: udc: renesas_usb3: add support for generic phy")
> > Cc: <stable@xxxxxxxxxxxxxxx> # v4.15+
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> > ---
> > drivers/usb/gadget/udc/renesas_usb3.c | 16 ++++++++--------
> > 1 file changed, 8 insertions(+), 8 deletions(-)
>
> Reviewed-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
>
>
> Please see some suggestions for follow-up lower-priority patches below.
Thank you for the review and suggestions!
> >
> > diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
> > index 738b734..671bac3 100644
> > --- a/drivers/usb/gadget/udc/renesas_usb3.c
> > +++ b/drivers/usb/gadget/udc/renesas_usb3.c
> > @@ -2632,6 +2632,14 @@ static int renesas_usb3_probe(struct platform_device *pdev)
> > if (ret < 0)
> > goto err_alloc_prd;
> >
> > + /*
> > + * This is an optional. So, if this driver cannot get a phy,
> > + * this driver will not handle a phy anymore.
> > + */
>
> nit: s/an optional/optional/
Oops. I will fix and submit v2 patches.
> > + usb3->phy = devm_phy_get(&pdev->dev, "usb");
> > + if (IS_ERR(usb3->phy))
> > + usb3->phy = NULL;
>
> I think this will unintentionally ignore errors other than the
> non-existence of the device, f.e. a memory allocation failure
> in devm_phy_get().
>
> So perhaps something like this, as per phy_optional_get(), would be better?
>
> usb3->phy = devm_phy_get(&pdev->dev, "usb");
> if (IS_ERR(usb3->phy) && (PTR_ERR(usb3->phy) == -ENODEV))
> usb3->phy = NULL;
Thank you for the suggestion. I agree with you.
I think I should use devm_phy_optional_get() instead of dev_phy_get(), as you mentioned :)
So, I will fix the code by using devm_phy_optional_get() first, and then fix this.
Best regards,
Yoshihiro Shimoda
> > +
> > pm_runtime_enable(&pdev->dev);
> > ret = usb_add_gadget_udc(&pdev->dev, &usb3->gadget);
> > if (ret < 0)
> > @@ -2641,14 +2649,6 @@ static int renesas_usb3_probe(struct platform_device *pdev)
> > if (ret < 0)
> > goto err_dev_create;
> >
> > - /*
> > - * This is an optional. So, if this driver cannot get a phy,
> > - * this driver will not handle a phy anymore.
> > - */
> > - usb3->phy = devm_phy_get(&pdev->dev, "usb");
> > - if (IS_ERR(usb3->phy))
> > - usb3->phy = NULL;
> > -
> > usb3->workaround_for_vbus = priv->workaround_for_vbus;
> >
> > renesas_usb3_debugfs_init(usb3, &pdev->dev);
> > --
> > 1.9.1
> >
