On Wed, May 18, 2016 at 07:14:01PM +0200, Peter Wu wrote:
> Hi,
>
> While testing the pci/pm tree from Bjorn with HEAD being 0195d2813547
> ("PCI: Add runtime PM support for PCIe ports"), I have noticed that
> detaching and rescanning is broken.
>
> When a bridgr is in D3 state, it cannot discover children. Reproducer:
>
> echo > /sys/bus/pci/devices/0000:01:00.0/remove 1
> # wait for the PCIe port to enter D3cold
> echo > /sys/bus/pci/devices/0000:00:01.0/rescan 1
> # Workaround to get the device back
> echo > /sys/bus/pci/devices/0000:00:01.0/power/control on
> echo > /sys/bus/pci/devices/0000:00:01.0/rescan 1
>
> lspci:
>
> 00:01.0 PCI bridge [0604]: Intel Corporation Skylake PCIe Controller (x16) [8086:1901] (rev 07)
> 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GM204M [GeForce GTX 965M] [10de:13d9] (rev a1)
>
> Probably needs a pm_runtime_{get,put}_sync in pci_rescan_bus and
> pci_rescan_bus_bridge_resize.
Thanks for reporting. Let me investigate this a bit.
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