linux-kernel - Re: [PATCH] PCI: imx6: Do not output error message when devm_clk_get() failed with -EPROBE

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Message-ID: <c2f17d7360387bf6d93d2ac24e5b326a542a5861.camel@pengutronix.de>
Date:   Mon, 10 Aug 2020 11:02:18 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Anson Huang <Anson.Huang@....com>, hongxing.zhu@....com,
        lorenzo.pieralisi@....com, robh@...nel.org, bhelgaas@...gle.com,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: Re: [PATCH] PCI: imx6: Do not output error message when
 devm_clk_get() failed with -EPROBE_DEFER

Am Dienstag, den 04.08.2020, 13:38 +0800 schrieb Anson Huang:
> When devm_clk_get() returns -EPROBE_DEFER, i.MX6 PCI driver should
> NOT print error message, just return -EPROBE_DEFER is enough.

The reasoning behind this change is fine, but I think we should use the
recently merged dev_err_probe() helper to achieve the same goal.

Regards,
Lucas

> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 30 ++++++++++++++++++++----------
>  1 file changed, 20 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 4e5c379..ee75d35 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -1076,20 +1076,26 @@ static int imx6_pcie_probe(struct platform_device *pdev)
>  	/* Fetch clocks */
>  	imx6_pcie->pcie_phy = devm_clk_get(dev, "pcie_phy");
>  	if (IS_ERR(imx6_pcie->pcie_phy)) {
> -		dev_err(dev, "pcie_phy clock source missing or invalid\n");
> -		return PTR_ERR(imx6_pcie->pcie_phy);
> +		ret = PTR_ERR(imx6_pcie->pcie_phy);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "pcie_phy clock source missing or invalid\n");
> +		return ret;
>  	}
>  
>  	imx6_pcie->pcie_bus = devm_clk_get(dev, "pcie_bus");
>  	if (IS_ERR(imx6_pcie->pcie_bus)) {
> -		dev_err(dev, "pcie_bus clock source missing or invalid\n");
> -		return PTR_ERR(imx6_pcie->pcie_bus);
> +		ret = PTR_ERR(imx6_pcie->pcie_bus);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "pcie_bus clock source missing or invalid\n");
> +		return ret;
>  	}
>  
>  	imx6_pcie->pcie = devm_clk_get(dev, "pcie");
>  	if (IS_ERR(imx6_pcie->pcie)) {
> -		dev_err(dev, "pcie clock source missing or invalid\n");
> -		return PTR_ERR(imx6_pcie->pcie);
> +		ret = PTR_ERR(imx6_pcie->pcie);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "pcie clock source missing or invalid\n");
> +		return ret;
>  	}
>  
>  	switch (imx6_pcie->drvdata->variant) {
> @@ -1097,15 +1103,19 @@ static int imx6_pcie_probe(struct platform_device *pdev)
>  		imx6_pcie->pcie_inbound_axi = devm_clk_get(dev,
>  							   "pcie_inbound_axi");
>  		if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
> -			dev_err(dev, "pcie_inbound_axi clock missing or invalid\n");
> -			return PTR_ERR(imx6_pcie->pcie_inbound_axi);
> +			ret = PTR_ERR(imx6_pcie->pcie_inbound_axi);
> +			if (ret != -EPROBE_DEFER)
> +				dev_err(dev, "pcie_inbound_axi clock missing or invalid\n");
> +			return ret;
>  		}
>  		break;
>  	case IMX8MQ:
>  		imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
>  		if (IS_ERR(imx6_pcie->pcie_aux)) {
> -			dev_err(dev, "pcie_aux clock source missing or invalid\n");
> -			return PTR_ERR(imx6_pcie->pcie_aux);
> +			ret = PTR_ERR(imx6_pcie->pcie_aux);
> +			if (ret != -EPROBE_DEFER)
> +				dev_err(dev, "pcie_aux clock source missing or invalid\n");
> +			return ret;
>  		}
>  		/* fall through */
>  	case IMX7D: