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.
--
Kind regards,
Peter Wu
https://lekensteyn.nl
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