linux-kernel - Re: [PATCH v1 1/1] PCI: probe: Use pci_find_vsec_capability() when looking for TBT devices

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Date:   Sun, 14 Nov 2021 07:22:31 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, kw@...ux.com
Subject: Re: [PATCH v1 1/1] PCI: probe: Use pci_find_vsec_capability() when
 looking for TBT devices

On Tue, Nov 09, 2021 at 05:16:04PM +0200, Andy Shevchenko wrote:
> -	while ((vsec = pci_find_next_ext_capability(dev, vsec,
> -						    PCI_EXT_CAP_ID_VNDR))) {
> -		pci_read_config_dword(dev, vsec + PCI_VNDR_HEADER, &header);
> -
> -		/* Is the device part of a Thunderbolt controller? */

Could you preserve that code comment please so that an uninitiated
reader knows what the is_thunderbolt flag is about?

Thanks!

Lukas

> -		if (dev->vendor == PCI_VENDOR_ID_INTEL &&
> -		    PCI_VNDR_HEADER_ID(header) == PCI_VSEC_ID_INTEL_TBT) {
> -			dev->is_thunderbolt = 1;
> -			return;
> -		}
> -	}
> +	vsec = pci_find_vsec_capability(dev, PCI_VENDOR_ID_INTEL, PCI_VSEC_ID_INTEL_TBT);
> +	if (vsec)
> +		dev->is_thunderbolt = 1;