Discussion:
A question about hotplug and suspend-resume functionallity
Igor Bezukh
2014-07-08 17:02:57 UTC
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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


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Greg KH
2014-07-08 17:29:57 UTC
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Post by Igor Bezukh
Hi,
(*) 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.
Not good, have you sent the kernel panic to the ***@vger.kernel.org
mailing list and cc:ed the driver authors?
Post by Igor Bezukh
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?
These questions would be best acked on the above list, the developers
there should be able to help you out.

good luck,

greg k-h
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