linux-kernel - Re: [Update 2][PATCH 2/7] ACPI / scan: Introduce common code for ACPI-based device hotplug

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Date:	Thu, 21 Feb 2013 10:39:40 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Jiang Liu <liuj97@...il.com>
Subject: Re: [Update 2][PATCH 2/7] ACPI / scan: Introduce common code for
 ACPI-based device hotplug

On Thu, 2013-02-21 at 16:52 +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
 :
> 
> This update fixes an issue pointed out by Toshi Kani (_OST shouldn't be
> evaluated after successful _EJ0).
> 
> Thanks,
> Rafael
> 
> ---
>  drivers/acpi/scan.c     |  272 ++++++++++++++++++++++++++++++++++++++----------
>  include/acpi/acpi_bus.h |    7 +
>  2 files changed, 226 insertions(+), 53 deletions(-)
 :
> +static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
> +{
> +	struct acpi_device *device = NULL;
> +	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
> +	int error;
> +
> +	mutex_lock(&acpi_scan_lock);
> +
> +	acpi_bus_get_device(handle, &device);
> +	if (device) {
> +		dev_warn(&device->dev, "Attempt to re-insert\n");
> +		goto out;
> +	}
> +	acpi_evaluate_hotplug_ost(handle, ost_source,
> +				  ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
> +	ost_source = ACPI_OST_EC_OSPM_INSERTION;

Thanks for the update.  I confirmed that _OST was handled correctly for
hot-delete.  However, I found there is an issue for hot-add too.
ACPI_OST_EC_OSPM_INSERTION is used for _OST when the OS initiated a
hot-add event (which may not happen today).  This case, however, is that
hot-add is initiated by FW through an ACPI notification.  So, ost_source
must have the ACPI notification event value.

Thanks,
-Toshi



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