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

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Date:   Wed, 18 Jan 2023 11:18:58 -0500
From:   Alan Stern <stern@...land.harvard.edu>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
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()

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?

Alan Stern

> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
>  drivers/usb/host/ohci-exynos.c | 24 +++++++-----------------
>  1 file changed, 7 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
> index 8d7977fd5d3bd502..8dd9c3b2411c383f 100644
> --- 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");
>  		}
>  	}
>  
> @@ -97,12 +90,10 @@ static int exynos_ohci_phy_enable(struct device *dev)
>  	int ret = 0;
>  
>  	for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
> -		if (!IS_ERR(exynos_ohci->phy[i]))
> -			ret = phy_power_on(exynos_ohci->phy[i]);
> +		ret = phy_power_on(exynos_ohci->phy[i]);
>  	if (ret)
>  		for (i--; i >= 0; i--)
> -			if (!IS_ERR(exynos_ohci->phy[i]))
> -				phy_power_off(exynos_ohci->phy[i]);
> +			phy_power_off(exynos_ohci->phy[i]);
>  
>  	return ret;
>  }
> @@ -114,8 +105,7 @@ static void exynos_ohci_phy_disable(struct device *dev)
>  	int i;
>  
>  	for (i = 0; i < PHY_NUMBER; i++)
> -		if (!IS_ERR(exynos_ohci->phy[i]))
> -			phy_power_off(exynos_ohci->phy[i]);
> +		phy_power_off(exynos_ohci->phy[i]);
>  }
>  
>  static int exynos_ohci_probe(struct platform_device *pdev)
> -- 
> 2.34.1
>