linux-kernel - Re: [PATCH v8 07/22] ACPI: Separate acpi_bus

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Date:	Mon, 14 Jan 2013 22:31:35 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, Len Brown <lenb@...nel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v8 07/22] ACPI: Separate acpi_bus_trim to support two steps.

On Sat, Jan 12, 2013 at 2:40 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Friday, January 11, 2013 02:40:34 PM Yinghai Lu wrote:
>> Current all acpi_bus_trim callers have rmdevice to 1.
>> that means it will remove all acpi devices.
>>
>> When 0, is passed, it will keep the parent.
>>
>> For root bus hotremove support, we need to have pci device to be
>> removed before acpi devices.
>>
>> So try to keep all acpi devices, and only stop drivers with them.
>>
>> This change should be safe because all current callers all have 1 passed.
>
> I'm not sure how the chanelog is related to the patch itself.
>
> The patch modifies the behavior of acpi_bus_trim() to avoid removing all
> devices (not just the start point) for rmdevice==0, which doesn't really change
> the functionality, because all callers pass rmdevice=1 anyway.
>
> Yes, we can make this change, but why is it necessary?
>
> And why don't we remove the rmdevice argument from acpi_bus_trim() altogether?

this patch is not needed after your changes with acpi_bus_trim.

Yinghai
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