Re: [BUGFIX 1/9] ACPI, DOCK: initialize dock subsystem before scanning PCI root buses

[Rafael J. Wysocki]

On Friday, June 14, 2013 12:32:24 AM Jiang Liu wrote:
> Changeset "3b63aaa70e1 PCI: acpiphp: Do not use ACPI PCI subdriver
> mechanism" causes a regression which breaks ACPI dock support,
> please refer to https://bugzilla.kernel.org/show_bug.cgi?id=59501
> 
> The root cause is that changeset 3b63aaa70e1 changed the relative
> initialization order of ACPI dock subsystem and acpiphp driver,
> and acpiphp driver has dependency on ACPI dock subsystem's
> initialization result, so that acpiphp can't correctly detect ACPI
> dock stations now.
> 
> On the other hand, ACPI dock is a built-in driver, so we could
> explicitly initialize it before the acpiphp driver is used.

This change makes sense to me.

Thanks,
Rafael


> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx>
> Reported-by: Alexander E. Patrakov <patrakov@xxxxxxxxx>
> Tested-by: Alexander E. Patrakov <patrakov@xxxxxxxxx>
> Cc: "Rafael J. Wysocki" <rjw@xxxxxxx>
> Cc: linux-acpi@xxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: <stable@xxxxxxxxxxxxxxx> # 3.9+
> ---
>  drivers/acpi/dock.c     | 7 +------
>  drivers/acpi/internal.h | 5 +++++
>  drivers/acpi/scan.c     | 1 +
>  3 files changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
> index 4fdea38..02b0563 100644
> --- a/drivers/acpi/dock.c
> +++ b/drivers/acpi/dock.c
> @@ -1033,7 +1033,7 @@ find_dock_and_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
>  	return AE_OK;
>  }
>  
> -static int __init dock_init(void)
> +int __init acpi_dock_init(void)
>  {
>  	if (acpi_disabled)
>  		return 0;
> @@ -1062,9 +1062,4 @@ static void __exit dock_exit(void)
>  		dock_remove(dock_station);
>  }
>  
> -/*
> - * Must be called before drivers of devices in dock, otherwise we can't know
> - * which devices are in a dock
> - */
> -subsys_initcall(dock_init);
>  module_exit(dock_exit);
> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> index 297cbf4..c610a76 100644
> --- a/drivers/acpi/internal.h
> +++ b/drivers/acpi/internal.h
> @@ -40,6 +40,11 @@ void acpi_container_init(void);
>  #else
>  static inline void acpi_container_init(void) {}
>  #endif
> +#ifdef CONFIG_ACPI_DOCK
> +void acpi_dock_init(void);
> +#else
> +static inline void acpi_dock_init(void) {}
> +#endif
>  #ifdef CONFIG_ACPI_HOTPLUG_MEMORY
>  void acpi_memory_hotplug_init(void);
>  #else
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 44225cb..4148163 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -2045,6 +2045,7 @@ int __init acpi_scan_init(void)
>  	acpi_lpss_init();
>  	acpi_container_init();
>  	acpi_memory_hotplug_init();
> +	acpi_dock_init();
>  
>  	mutex_lock(&acpi_scan_lock);
>  	/*
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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