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Date: Tue, 10 Jul 2012 16:40:14 -0700
Message-ID: <CAE9FiQV0NM+9pQVUETSnQg=2qcMswCYMjLEguYnaaMjyjn+teQ@mail.gmail.com>
Subject: Re: [PATCH 2/5] pciehp: Don't enable presence notification while
 surprise removal is not supported.
From: Yinghai Lu <yinghai@kernel.org>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org,
	Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
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On Tue, Jul 10, 2012 at 4:28 PM, Bjorn Helgaas <bhelgaas@google.com> wrote:
> On Tue, Jul 10, 2012 at 5:12 PM, Yinghai Lu <yinghai@kernel.org> wrote:
>> Interesting, that means after card is plugged in, we don't need to
>> press attention button to bring
>> it online.
>>
>> And other oses like windows and solaris do need to press the button
>> like current linux doing.
>
> The attention button is apparently optional, depending on the form factor.
>
> I would guess that on a platform with no attention button and Hot-Plug
> Surprise == 0, Linux would be unable to do a hot-add.

yes.