linux-kernel - Re: [PATCH 4/4] cxl/pci: Define a common function get_cxl

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Date: Wed, 22 May 2024 17:45:54 -0700
From: Alison Schofield <alison.schofield@...el.com>
To: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
Cc: linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-cxl@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Yazen Ghannam <yazen.ghannam@....com>,
	Bowman Terry <terry.bowman@....com>
Subject: Re: [PATCH 4/4] cxl/pci: Define a common function get_cxl_dev()

On Wed, May 22, 2024 at 03:08:39PM +0000, Smita Koralahalli wrote:
> Refactor computation of cxlds to a common function get_cxl_dev() and reuse
> the function in both cxl_handle_cper_event() and cxl_handle_prot_err().
> 
> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
> ---
>  drivers/cxl/pci.c | 52 +++++++++++++++++++++++------------------------
>  1 file changed, 26 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
> index 3e3c36983686..26e65e5b68cb 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -974,32 +974,43 @@ static struct pci_driver cxl_pci_driver = {
>  	},
>  };
>  
> +static struct cxl_dev_state *get_cxl_dev(u16 segment, u8 bus, u8 device,
> +					 u8 function)
> +{
> +	struct pci_dev *pdev __free(pci_dev_put) = NULL;
> +	struct cxl_dev_state *cxlds;
> +	unsigned int devfn;
> +
> +	devfn = PCI_DEVFN(device, function);
> +	pdev = pci_get_domain_bus_and_slot(segment, bus, devfn);
> +
> +	if (!pdev)
> +		return NULL;
> +
> +	guard(device)(&pdev->dev);
> +	if (pdev->driver != &cxl_pci_driver)
> +		return NULL;
> +
> +	cxlds = pci_get_drvdata(pdev);
> +
> +	return cxlds;

This can be:
	return pci_get_drvdata(pdev);


> +}

snip