Re: [PATCH] PCI: dw-rockchip: Add error messages in .probe()s error paths

From: "Heiko Stübner" <heiko@sntech.de>
To: "Lorenzo Pieralisi" <lpieralisi@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Lei Chuanhua" <lchuanhua@maxlinear.com>,
	"Manivannan Sadhasivam" <manivannan.sadhasivam@linaro.org>,
	"Jesper Nilsson" <jesper.nilsson@axis.com>,
	"Nobuhiro Iwamatsu" <nobuhiro1.iwamatsu@toshiba.co.jp>,
	"Yoshihiro Shimoda" <yoshihiro.shimoda.uh@renesas.com>,
	"Damien Le Moal" <dlemoal@kernel.org>,
	"Uwe Kleine-König" <ukleinek@debian.org>
Cc: Rob Herring <robh@kernel.org>,
	linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org
Subject: Re: [PATCH] PCI: dw-rockchip: Add error messages in .probe()s error paths
Date: Tue, 27 Feb 2024 12:57:28 +0100	[thread overview]
Message-ID: <2949150.o0KrE1Onz3@diego> (raw)
In-Reply-To: <20240227111837.395422-2-ukleinek@debian.org>

Am Dienstag, 27. Februar 2024, 12:18:35 CET schrieb Uwe Kleine-König:
> Drivers that silently fail to probe provide a bad user experience and
> make it unnecessarily hard to debug such a failure. Fix it by using
> dev_err_probe() instead of a plain return.
> 
> Signed-off-by: Uwe Kleine-König <ukleinek@debian.org>

Looks like a much better behavior this way

Reviewed-by: Heiko Stuebner <heiko@sntech.de>

> ---
>  drivers/pci/controller/dwc/pcie-dw-rockchip.c | 23 ++++++++++++-------
>  1 file changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> index d6842141d384..4c16d8d2e178 100644
> --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> @@ -225,11 +225,17 @@ static int rockchip_pcie_clk_init(struct rockchip_pcie *rockchip)
>  
>  	ret = devm_clk_bulk_get_all(dev, &rockchip->clks);
>  	if (ret < 0)
> -		return ret;
> +		return dev_err_probe(rockchip->pci.dev, ret,
> +				     "failed to get clocks\n");
>  
>  	rockchip->clk_cnt = ret;
>  
> -	return clk_bulk_prepare_enable(rockchip->clk_cnt, rockchip->clks);
> +	ret = clk_bulk_prepare_enable(rockchip->clk_cnt, rockchip->clks);
> +	if (ret)
> +		return dev_err_probe(rockchip->pci.dev, ret,
> +				     "failed to enable clocks\n");
> +
> +	return 0;
>  }
>  
>  static int rockchip_pcie_resource_get(struct platform_device *pdev,
> @@ -237,12 +243,14 @@ static int rockchip_pcie_resource_get(struct platform_device *pdev,
>  {
>  	rockchip->apb_base = devm_platform_ioremap_resource_byname(pdev, "apb");
>  	if (IS_ERR(rockchip->apb_base))
> -		return PTR_ERR(rockchip->apb_base);
> +		return dev_err_probe(&pdev->dev, PTR_ERR(rockchip->apb_base),
> +				     "failed to map apb registers\n");
>  
>  	rockchip->rst_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
>  						     GPIOD_OUT_HIGH);
>  	if (IS_ERR(rockchip->rst_gpio))
> -		return PTR_ERR(rockchip->rst_gpio);
> +		return dev_err_probe(&pdev->dev, PTR_ERR(rockchip->rst_gpio),
> +				     "failed to get reset gpio\n");
>  
>  	rockchip->rst = devm_reset_control_array_get_exclusive(&pdev->dev);
>  	if (IS_ERR(rockchip->rst))
> @@ -320,10 +328,9 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>  		rockchip->vpcie3v3 = NULL;
>  	} else {
>  		ret = regulator_enable(rockchip->vpcie3v3);
> -		if (ret) {
> -			dev_err(dev, "failed to enable vpcie3v3 regulator\n");
> -			return ret;
> -		}
> +		if (ret)
> +			return dev_err_probe(dev, ret,
> +					     "failed to enable vpcie3v3 regulator\n");
>  	}
>  
>  	ret = rockchip_pcie_phy_init(rockchip);
> 
> base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
> 


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