linux-kernel - Re: [PATCH] ACPI: Use the acpi_device_is

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Date:   Fri, 20 Oct 2023 18:52:00 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Miguel Luis <miguel.luis@...cle.com>,
        Russell King <rmk+kernel@...linux.org.uk>
Cc:     "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "loongarch@...ts.linux.dev" <loongarch@...ts.linux.dev>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "kvmarm@...ts.linux.dev" <kvmarm@...ts.linux.dev>,
        "x86@...nel.org" <x86@...nel.org>,
        James Morse <james.morse@....com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        "jianyong.wu@....com" <jianyong.wu@....com>,
        "justin.he@....com" <justin.he@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>
Subject: Re: [PATCH] ACPI: Use the acpi_device_is_present() helper in more places

On Fri, Oct 20, 2023 at 4:52 PM Miguel Luis <miguel.luis@...cle.com> wrote:
>
> Hi Russell,
>
> > On 20 Oct 2023, at 13:59, Russell King <rmk+kernel@...linux.org.uk> wrote:
> >
> > From: James Morse <james.morse@....com>
> >
> > acpi_device_is_present() checks the present or functional bits
> > from the cached copy of _STA.
> >
> > A few places open-code this check. Use the helper instead to
> > improve readability.
> >
> > Signed-off-by: James Morse <james.morse@....com>
> > Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> > Reviewed-by: Gavin Shan <gshan@...hat.com>
> > Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> > ---
> > Jonathan Cameron suggests "Pull this one out and send it upstream in
> > advance of the rest" so let's do that. See
> > https://lore.kernel.org/r/20230914130455.00004434@Huawei.com/
> >
> > So, let's get this upstream to reduce the number of outstanding patches
> > for aarch64 vcpu hotplug.
> >
> > drivers/acpi/scan.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> > index 691d4b7686ee..ed01e19514ef 100644
> > --- a/drivers/acpi/scan.c
> > +++ b/drivers/acpi/scan.c
> > @@ -304,7 +304,7 @@ static int acpi_scan_device_check(struct acpi_device *adev)
> > int error;
> >
> > acpi_bus_get_status(adev);
> > - if (adev->status.present || adev->status.functional) {
> > + if (acpi_device_is_present(adev)) {
> > /*
> > * This function is only called for device objects for which
> > * matching scan handlers exist.  The only situation in which
> > @@ -338,7 +338,7 @@ static int acpi_scan_bus_check(struct acpi_device *adev, void *not_used)
> > int error;
> >
> > acpi_bus_get_status(adev);
> > - if (!(adev->status.present || adev->status.functional)) {
> > + if (!acpi_device_is_present(adev)) {
>
> Reviewed-by: Miguel Luis <miguel.luis@...cle.com>

Applied as 6.7 material, thanks!