linux-kernel - Re: [PATCH v8 22/22] PCI: move device_add out of pci_bus_add

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Message-ID: <CAE9FiQVrUkMTP8yFcXVgq3SW9tv6r0WBxfHbV=yT0vYbO=zmFQ@mail.gmail.com>
Date:	Mon, 14 Jan 2013 23:10:36 -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 22/22] PCI: move device_add out of pci_bus_add_device()

On Sat, Jan 12, 2013 at 3:54 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>> Move out device registering out of pci_bus_add_devices, so we could
>> put new created pci devices in device tree early.
>>
>> new pci_bus_add_devices will do the device_attach work to load pci drivers
>> instead.
>
> I wonder what problem it solves?

we want to put created pci device in the device tree as soon as possible.
so for_pci_dev will not miss them.

but at that time, we can not load driver for them yet. need to after
pci_assign_unsigned_resources etc to make sure all pci devices get
resource allocated at first.

so only move adding to device tree early, and leave loading driver on
the old places.

Yinghai
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