linux-kernel - Re: [PATCH v4 1/6] mpt3sas: Introduce mpt3sas_base_pci_device_is

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Message-ID: <20181002140443.GA120535@bhelgaas-glaptop.roam.corp.google.com>
Date:   Tue, 2 Oct 2018 09:04:43 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>
Cc:     lukas@...ner.de, linux-scsi@...r.kernel.org,
        linux-pci@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Sathya Prakash <Sathya.Prakash@...adcom.com>,
        Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
        ruscur@...sell.cc, sbobroff@...ux.ibm.com, oohall@...il.com
Subject: Re: [PATCH v4 1/6] mpt3sas: Introduce
 mpt3sas_base_pci_device_is_available

On Mon, Oct 01, 2018 at 03:40:51PM -0500, Bjorn Helgaas wrote:
> I think the names "pci_device_is_present()" and
> "mpt3sas_base_pci_device_is_available()" contribute to the problem
> because they make promises that can't be kept -- all we can say is
> that the device *was* present, but we know whether it is *still*
> present.

Oops, I meant "we DON'T know whether it is still present."

> I think it would be better if the interfaces were something
> like "pci_device_is_absent()" because that gives a result we can rely
> on.  If that returns true, we know the device is definitely gone.
> 
> Bjorn