linux-kernel - Re: [PATCH v3 5/7] PCI: xilinx-nwl: Clean up clock on probe failure/removal

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Date: Thu, 23 May 2024 21:18:02 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Sean Anderson <sean.anderson@...ux.dev>,
 linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
 Krzysztof Wilczyński <kw@...ux.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>, Rob Herring <robh@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>,
 Bjorn Helgaas <bhelgaas@...gle.com>,
 Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
 Michal Simek <michal.simek@....com>, Michal Simek <michal.simek@...inx.com>,
 Thippeswamy Havalige <thippeswamy.havalige@....com>
Subject: Re: [PATCH v3 5/7] PCI: xilinx-nwl: Clean up clock on probe
 failure/removal

> Make sure we turn off the clock on probe failure and device removal.
…
> +++ b/drivers/pci/controller/pcie-xilinx-nwl.c
…
> @@ -817,11 +818,23 @@ static int nwl_pcie_probe(struct platform_device *pdev)
>  		err = nwl_pcie_enable_msi(pcie);
>  		if (err < 0) {
>  			dev_err(dev, "failed to enable MSI support: %d\n", err);
> -			return err;
> +			goto err_clk;
>  		}
>  	}
>
> -	return pci_host_probe(bridge);
> +	err = pci_host_probe(bridge);
> +
> +err_clk:
> +	if (err)
> +		clk_disable_unprepare(pcie->clk);

I suggest to use the label “disable_unprepare_clock” directly before this function call
(in the if branch) so that a duplicate check would be avoided after some error cases.

Regards,
Markus