From mboxrd@z Thu Jan  1 00:00:00 1970
From: Igor Bezukh <Igor@galilsoft.com>
Date: Tue, 08 Jul 2014 17:02:57 +0000
Subject: A question about hotplug and suspend-resume functionallity
Message-Id: <1404838924725.18833@galilsoft.com>
List-Id: <linux-hotplug.vger.kernel.org>
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To: linux-hotplug@vger.kernel.org

Hi,


We are testing Intel Gigabit adapter driver (igb) under Fedora 20, kernel 3.14.4 for the following use-case:

(*) Adapter is connected to the PCIE slot
(*) We put the system under suspend by running pm-suspend from user-space
(*) Remove the adapter from the PCIE slot
(*) Wake up the system

Currently, we got kernel panics and the system gets stuck.

My questions are - 
1) in order to support hot-unplugging in igb driver, should I implement the check of device presence in igb_resume
function?

2) After the system wakes up, I see in dmesg that the PCI device function igb refuses to change power state and remains in PCI power state D3.
     can I assume that after suspend-resume if the function remains in D3 and refuses to move to D1 then hot-unplug event has occured?

Thanks and BR,
Igor Bezukh