On Sat, Oct 12, 2024 at 02:48:48AM +0200, Marek Vasut wrote: > The pci_host_probe() does reallocate BARs for devices which start up with > uninitialized BAR addresses set to 0 by calling pci_bus_assign_resources(), > which updates the device config space content. > > At the same time, pci_pm_runtime_suspend() triggers pci_save_state() for > all devices which do not have drivers assigned to them to store current > content of their config space registers. [...] > Work around the issue by not suspending pci_bus_type devices which do > not have driver assigned to them, keep those devices active to prevent > pci_save_state() from being called. Once a proper driver takes over, it > can RPM manage the device correctly. It sounds like you may want to acquire a runtime PM reference or disable runtime PM for the duration of the bus scan (or at least device scan) rather than the proposed workaround. Thanks, Lukas
