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From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Bjorn Helgaas <bhelgaas@google.com>, Len Brown <lenb@kernel.org>,
	Lukas Wunner <lukas@wunner.de>,
	Keith Busch <keith.busch@intel.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Alexandru Gagniuc <mr.nuke.me@gmail.com>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Linux PCI <linux-pci@vger.kernel.org>
Subject: Re: [PATCH v2 1/3] PCI / ACPI: Use cached ACPI device state to get PCI device power state
Date: Mon, 24 Jun 2019 13:58:32 +0300
Message-ID: <20190624105832.GE2640@lahna.fi.intel.com> (raw)
In-Reply-To: <CAJZ5v0huw-n1m3mz2fEk9y2ejQuT4XYeP8_a-iR+epSq5Wu6yQ@mail.gmail.com>

On Fri, Jun 21, 2019 at 01:56:49PM +0200, Rafael J. Wysocki wrote:
> On Tue, Jun 18, 2019 at 6:19 PM Mika Westerberg
> <mika.westerberg@linux.intel.com> wrote:
> >
> 
> Actually, to start with, you can say that the ACPI power state
> returned by acpi_device_get_power() may depend on the configuration of
> ACPI power resources in the system which may change at any time after
> acpi_device_get_power() has returned, unless the reference counters of
> the ACPI power resources in question are set to prevent that from
> happening.  Thus it is invalid to use acpi_device_get_power() in
> acpi_pci_get_power_state() the way it is done now and the value of the
> power.state field in the corresponding struct acpi_device object
> (which reflects the ACPI power resources reference counting, among
> other things) should be used instead.
> 
> Then you can describe the particular issue below as an example.
> 
> IMO that would explain the rationale better here.

Thanks! I'll update the changelog accordingly.

  reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-18 16:18 [PATCH v2 0/3] PCI / ACPI: Handle sibling devices sharing power resources Mika Westerberg
2019-06-18 16:18 ` [PATCH v2 1/3] PCI / ACPI: Use cached ACPI device state to get PCI device power state Mika Westerberg
2019-06-19 21:28   ` Bjorn Helgaas
2019-06-20  8:27     ` Mika Westerberg
2019-06-20 13:16       ` Bjorn Helgaas
2019-06-20 13:37         ` Mika Westerberg
2019-06-20 14:15           ` Bjorn Helgaas
2019-06-21 10:32             ` Rafael J. Wysocki
2019-06-21 13:09               ` Bjorn Helgaas
2019-06-22  8:51                 ` Rafael J. Wysocki
2019-06-24 10:57                   ` Mika Westerberg
2019-06-24 11:14               ` Rafael J. Wysocki
2019-06-25  9:45                 ` Mika Westerberg
2019-06-25 10:00                   ` Rafael J. Wysocki
2019-06-25 10:08                     ` Mika Westerberg
2019-06-21 11:56   ` Rafael J. Wysocki
2019-06-24 10:58     ` Mika Westerberg [this message]
2019-06-18 16:18 ` [PATCH v2 2/3] ACPI / PM: Introduce concept of a _PR0 dependent device Mika Westerberg
2019-06-19 13:20   ` Rafael J. Wysocki
2019-06-19 13:34     ` Mika Westerberg
2019-06-18 16:18 ` [PATCH v2 3/3] PCI / ACPI: Add _PR0 dependent devices Mika Westerberg
2019-06-19 13:24 ` [PATCH v2 0/3] PCI / ACPI: Handle sibling devices sharing power resources Rafael J. Wysocki

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