linux-kernel - Re: [PATCH v2 1/8] ACPI / PM: Run wakeup notify handlers synchronously

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Message-ID: <CAJZ5v0gtGfpwHM-n+-e=Vc_+PwSMC3YxM1XESTgxL5Z1R-XsNg@mail.gmail.com>
Date:   Thu, 15 Jun 2017 00:22:25 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Linux USB <linux-usb@...r.kernel.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Felipe Balbi <balbi@...nel.org>,
        Mario Limonciello <mario_limonciello@...l.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Hans De Goede <hdegoede@...hat.com>,
        Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH v2 1/8] ACPI / PM: Run wakeup notify handlers synchronously

On Wed, Jun 14, 2017 at 8:09 PM, Bjorn Helgaas <helgaas@...nel.org> wrote:
> On Mon, Jun 12, 2017 at 10:48:41PM +0200, Rafael J. Wysocki wrote:
>> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>
>> The work functions provided by the users of acpi_add_pm_notifier()
>> should be run synchronously before re-enabling the wakeup GPE in
>> case they are used to clear the status and/or disable the wakeup
>> signaling at the source.  Otherwise, which is the case currently in
>> the PCI bus type code, the same wakeup event may be signaled for
>> multiple times while the execution of the work function in response
>> to it has already been queued up.
>>
>> Fortunately, acpi_add_pm_notifier() is only used by PCI and by
>> ACPI device PM code internally, so the change is relatively
>> straightforward to make.
>>
>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

Thanks!