linux-kernel - Re: [PATCH] PCI: kirin: Fix an error path in kirin_pcie

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Message-ID: <20231031083553.GD11778@thinkpad>
Date:   Tue, 31 Oct 2023 14:05:53 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Xiaowei Song <songxiaowei@...ilicon.com>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH] PCI: kirin: Fix an error path in kirin_pcie_probe()

On Mon, Oct 30, 2023 at 09:21:16AM +0100, Christophe JAILLET wrote:
> If an error occurs after a successful kirin_pcie_power_on(),
> kirin_pcie_power_off() should be called, as already done in the remove
> function.
> 

PERST# assert (gpio_id_dwc_perst) is missing from kirin_pcie_power_off(). So
first you need to add that in a separate patch and then this patch can come
next.

Also, this driver is using legacy GPIO APIs and needs cleanup too (Kudos if you
are willing to do that).

- Mani

> Fixes: fc5165db245a ("PCI: kirin: Add HiSilicon Kirin SoC PCIe controller driver")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> Not sure of the Fixes tag.
> ---
>  drivers/pci/controller/dwc/pcie-kirin.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
> index 2ee146767971..0b93de9d2d06 100644
> --- a/drivers/pci/controller/dwc/pcie-kirin.c
> +++ b/drivers/pci/controller/dwc/pcie-kirin.c
> @@ -813,7 +813,15 @@ static int kirin_pcie_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> -	return dw_pcie_host_init(&pci->pp);
> +	ret = dw_pcie_host_init(&pci->pp);
> +	if (ret)
> +		goto err_power_off;
> +
> +	return 0;
> +
> +err_power_off:
> +	kirin_pcie_power_off(kirin_pcie);
> +	return ret;
>  }
>  
>  static struct platform_driver kirin_pcie_driver = {
> -- 
> 2.34.1
> 

-- 
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