linux-kernel - Re: [PATCH 2/3] ACPI / PM: Split acpi_device

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Date:   Tue, 25 Jul 2017 15:45:27 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux PCI <linux-pci@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH 2/3] ACPI / PM: Split acpi_device_wakeup()

On Fri, Jul 21, 2017 at 02:40:49PM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> To prepare for a subsequent change and make the code somewhat easier
> to follow, do the following in the ACPI device wakeup handling code:
> 
>  * Replace wakeup.flags.enabled under struct acpi_device with
>    wakeup.enable_count as that will be necessary going forward.
> 
>    For now, wakeup.enable_count is not allowed to grow beyond 1,
>    so the current behavior is retained.
> 
>  * Split acpi_device_wakeup() into acpi_device_wakeup_enable()
>    and acpi_device_wakeup_disable() and modify the callers of
>    it accordingly.
> 
>  * Introduce a new acpi_wakeup_lock mutex to protect the wakeup
>    enabling/disabling code from races in case it is executed
>    more than once in parallel for the same device (which may
>    happen for bridges theoretically).
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>