On a hotplug event with enabled BAR movement, calculating new BAR layout and bridge windows takes some time. During this procedure, the structures representing these windows are released - marked for recalculation. When the new bridge window values are ready, they are written to the bridge registers via pci_setup_bridges(). Currently, bridge's registers are updated immediately after releasing a window to disable it. But if a driver doesn't yet support movable BARs, it doesn't stop MEM transactions during the hotplug, so disabled bridge windows will break them. Let the bridge windows remain operating after releasing, as they will be updated to the new values in the end of a hotplug event. Signed-off-by: Sergei Miroshnichenko <s.miroshnichenko@xxxxxxxxx> --- drivers/pci/setup-bus.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 4cadfa1f9519..3081f2d2a48a 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1635,7 +1635,8 @@ static void pci_bridge_release_resources(struct pci_bus *bus, /* Avoiding touch the one without PREF */ if (type & IORESOURCE_PREFETCH) type = IORESOURCE_PREFETCH; - __pci_setup_bridge(bus, type); + if (!pci_can_move_bars) + __pci_setup_bridge(bus, type); /* For next child res under same bridge */ r->flags = old_flags; } -- 2.24.1
