On Tue, Nov 12, 2019 at 09:17:52PM -0600, Bjorn Helgaas wrote: > On Tue, Oct 29, 2019 at 08:00:22PM +0300, Mika Westerberg wrote: > > parent PCIe downstream port, who got the hot-remove event, starts > > removing devices below it taking pci_lock_rescan_remove() lock. When the > > child PCIe port is runtime resumed it calls pciehp_check_presence() > > which ends up calling pciehp_card_present() and pciehp_check_link_active(). > > Oh, I see, pciehp_resume() calls pciehp_check_presence(), which > schedules the IRQ thread via pciehp_request(). So does this deadlock > only happen if the port(s) have been runtime suspended? No, there is a multitude of situations when the deadlock may occur and this is just one of them. See my comment on v1 of this patch: https://patchwork.ozlabs.org/patch/1117870/#2230798 Thanks, Lukas
