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SubjectRe: [Patch v1 1/3] ACPI: add callback prepare() into acpi_hotplug_handler
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On Wed, 2014-01-22 at 00:17 +0100, Rafael J. Wysocki wrote:
> On Tuesday, January 21, 2014 02:14:57 PM Toshi Kani wrote:
> > On Sat, 2014-01-18 at 10:48 +0800, Jiang Liu wrote:
> > > Add callback prepare() into acpi_hotplug_handler, which will get called
> > > at the very beginning of ACPI hotplug event handler. The ACPI core will
> > > ignore the event if prepare() returns NOTIFY_STOP.
> > >
> > > Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
> > > ---
> > > drivers/acpi/scan.c | 4 ++++
> > > include/acpi/acpi_bus.h | 1 +
> > > 2 files changed, 5 insertions(+)
> > >
> > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> > > index fd39459..6b0f419 100644
> > > --- a/drivers/acpi/scan.c
> > > +++ b/drivers/acpi/scan.c
> > > @@ -392,6 +392,10 @@ static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
> > > struct acpi_device *adev;
> > > acpi_status status;
> > >
> > > + if (handler->prepare &&
> > > + handler->prepare(handle, type, data) == NOTIFY_STOP)
> > > + return;
> >
> > The OS is responsible for calling _OST when it is implemented. So you
> > cannot just return here. See acpi_hotplug_unsupported(handle, type)
> > next line. Also, please describe why prepare() needs to be added.
>
> I don't think it's needed any more, please see:
>
> http://marc.info/?l=linux-acpi&m=139001691317575&w=2

Oh, I see. Thanks!
-Toshi



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