linux-kernel - Re: [PATCH V2 1/2] PCI: Add ACPI StorageD3Enable

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Date:   Thu, 25 Jun 2020 15:16:19 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        "David E. Box" <david.e.box@...ux.intel.com>, shyjumon.n@...el.com,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        linux-nvme <linux-nvme@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>
Subject: Re: [PATCH V2 1/2] PCI: Add ACPI StorageD3Enable _DSD support

On Thu, Jun 25, 2020 at 01:30:53PM +0200, Rafael J. Wysocki wrote:
> It is not necessary to call acpi_pci_find_companion() from
> pci_acpi_storage_d3() as long as that function is required to be
> called by the target device's driver probe or later.
> 
> Ths acpi_pci_bridge_d3() case is different, though, AFAICS, because it
> is invoked in the pci_pm_init() path, via pci_bridge_d3_possible(),
> and that gets called from pci_device_add() *before* calling
> device_add().
> 
> Mika, is that why acpi_pci_find_companion() gets callled from
> acpi_pci_bridge_d3()?

Yes, that's correct.