linux-kernel - Re: [PATCH v3] ACPI/pci-bind: remove bind/unbind callbacks from acpi_device

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Date:	Sun, 16 Sep 2012 09:49:43 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Yijing Wang <wangyijing@...wei.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v3] ACPI/pci-bind: remove bind/unbind callbacks from acpi_device_ops

On Sun, Sep 16, 2012 at 7:09 AM, Jiang Liu <liuj97@...il.com> wrote:
> Now ACPI devices are created before/destroyed after corresponding PCI
> devices, and acpi_platform_notify/acpi_platform_notify_remove will
> update PCI<->ACPI binding relationship when creating/destroying PCI
> devices, there's no need to invoke bind/unbind callbacks from ACPI
> device probe/destroy routines anymore. So remove bind/unbind callbacks
> from acpi_device_ops.
>
> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> ---
> V2->V3:
>         Simplify implementation according to Yinghai's suggestion.
> ---
>  drivers/acpi/glue.c         |   15 ++++---
>  drivers/acpi/internal.h     |    3 +-
>  drivers/acpi/pci_bind.c     |  102 ++++++++++---------------------------------
>  drivers/acpi/pci_root.c     |    9 ----
>  drivers/acpi/scan.c         |   21 +--------
>  include/acpi/acpi_bus.h     |    4 --
>  include/acpi/acpi_drivers.h |    1 -
>  7 files changed, 36 insertions(+), 119 deletions(-)
>
> diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
> index 4904700..9779fb7 100644
> --- a/drivers/acpi/glue.c
> +++ b/drivers/acpi/glue.c
> @@ -160,10 +160,13 @@ static int acpi_bind_one(struct device *dev, acpi_handle handle)
>         }
>         dev->archdata.acpi_handle = handle;
>
> -       acpi_pci_bind_notify(dev->archdata.acpi_handle, dev, true);
> -
>         status = acpi_bus_get_device(handle, &acpi_dev);
> -       if (!ACPI_FAILURE(status)) {
> +       if (!ACPI_FAILURE(status))
> +               acpi_dev = NULL;
> +
> +       acpi_pci_bind_notify(dev->archdata.acpi_handle, acpi_dev, dev, true);

It seems you can do
    acpi_pci_bind_notify(acpi_dev, dev, true);
instead.

aka:
Do you have test case acpi_dev is not created before pci device?

Thanks

Yinghai
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