netdev - Re: [PATCH 7/7] usb: host: ohci-exynos: Convert to devm_of_phy_optional

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Message-ID: <CAMuHMdUsULA0PM26Y8WL2bGiBHGAGADS6eYLUp0CDVgm4N5kow@mail.gmail.com>
Date:   Wed, 18 Jan 2023 17:50:00 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Madalin Bucur <madalin.bucur@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Thierry Reding <thierry.reding@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Siddharth Vadapalli <s-vadapalli@...com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 7/7] usb: host: ohci-exynos: Convert to devm_of_phy_optional_get()

Hi Alan,

On Wed, Jan 18, 2023 at 5:26 PM Alan Stern <stern@...land.harvard.edu> wrote:
> On Wed, Jan 18, 2023 at 11:15:20AM +0100, Geert Uytterhoeven wrote:
> > Use the new devm_of_phy_optional_get() helper instead of open-coding the
> > same operation.
> >
> > This lets us drop several checks for IS_ERR(), as phy_power_{on,off}()
> > handle NULL parameters fine.
>
> The patch ignores a possible -ENOSYS error return.  Is it known that
> this will never happen?

While some phy_*() dummies in include/linux/phy/phy.h do return -ENOSYS
if CONFIG_GENERIC_PHY is not enabled, devm_of_phy_optional_get()
returns NULL in that case, so I think this cannot happen.

> > --- a/drivers/usb/host/ohci-exynos.c
> > +++ b/drivers/usb/host/ohci-exynos.c
> > @@ -69,19 +69,12 @@ static int exynos_ohci_get_phy(struct device *dev,
> >                       return -EINVAL;
> >               }
> >
> > -             phy = devm_of_phy_get(dev, child, NULL);
> > +             phy = devm_of_phy_optional_get(dev, child, NULL);
> >               exynos_ohci->phy[phy_number] = phy;
> >               if (IS_ERR(phy)) {
> > -                     ret = PTR_ERR(phy);
> > -                     if (ret == -EPROBE_DEFER) {
> > -                             of_node_put(child);
> > -                             return ret;
> > -                     } else if (ret != -ENOSYS && ret != -ENODEV) {
> > -                             dev_err(dev,
> > -                                     "Error retrieving usb2 phy: %d\n", ret);
> > -                             of_node_put(child);
> > -                             return ret;
> > -                     }
> > +                     of_node_put(child);
> > +                     return dev_err_probe(dev, PTR_ERR(phy),
> > +                                          "Error retrieving usb2 phy\n");
> >               }
> >       }
> >

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds