linux-kernel - Re: [PATCH v2 04/15] PCI: Add pci_find_vsec

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Message-ID: <20210203075103.GA18742@wunner.de>
Date:   Wed, 3 Feb 2021 08:51:03 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
Cc:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v2 04/15] PCI: Add pci_find_vsec_capability() to find a
 specific VSEC

On Wed, Feb 03, 2021 at 01:54:49AM +0000, Gustavo Pimentel wrote:
> On Tue, Feb 2, 2021 at 18:8:55, Lukas Wunner <lukas@...ner.de> wrote:
> > As the name implies, the capability is "vendor-specific", so it is
> > perfectly possible that two vendors use the same VSEC ID for different
> > things.
> > 
> > To make sure you're looking for the right capability, you need to pass
> > a u16 vendor into this function and bail out if dev->vendor is different.
> 
> This function will be called by the driver that will pass the correct 
> device which will be already pointing to the config space associated with 
> the endpoint for instance. Because the driver is already attached to the 
> endpoint through the vendor ID and device ID specified, there is no need 
> to do that validation, it will be redundant.

Okay.  Please amend the kernel-doc to make it explicit that it's the
caller's responsibility to check the vendor ID.

Thanks,

Lukas