linux-kernel - Re: [PATCH] PCI: mt7621: Use dev_err

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Date:   Thu, 23 Mar 2023 09:21:21 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     ye.xingchen@....com.cn, sergio.paracuellos@...il.com
Cc:     lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org,
        bhelgaas@...gle.com, matthias.bgg@...il.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] PCI: mt7621: Use dev_err_probe()

Il 23/03/23 04:45, ye.xingchen@....com.cn ha scritto:
> From: Ye Xingchen <ye.xingchen@....com.cn>
> 
> Replace the open-code with dev_err_probe() to simplify the code.
> 
> Signed-off-by: Ye Xingchen <ye.xingchen@....com.cn>
> ---
>   drivers/pci/controller/pcie-mt7621.c | 7 +++----
>   1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-mt7621.c b/drivers/pci/controller/pcie-mt7621.c
> index 63a5f4463a9f..964de0e8c6a0 100644
> --- a/drivers/pci/controller/pcie-mt7621.c
> +++ b/drivers/pci/controller/pcie-mt7621.c
> @@ -220,10 +220,9 @@ static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie,
>   	}
> 
>   	port->pcie_rst = of_reset_control_get_exclusive(node, NULL);
> -	if (PTR_ERR(port->pcie_rst) == -EPROBE_DEFER) {
> -		dev_err(dev, "failed to get pcie%d reset control\n", slot);
> -		return PTR_ERR(port->pcie_rst);
> -	}
> +
> +	return dev_err_probe(dev, PTR_ERR(port->pcie_rst),
> +			     "failed to get pcie%d reset control\n", slot);

That's breaking this function. You're unconditionally returning.

I think that this is fine as it is, but if you really want to use dev_err_probe()
here, this could be...

ret = dev_err_probe(dev, PTR_ERR(port->pcie_rst), "failed ...." ...);
if (ret)
	return ret;

Regards,
Angelo

> 
>   	snprintf(name, sizeof(name), "pcie-phy%d", slot);
>   	port->phy = devm_of_phy_get(dev, node, name);