4.18-stable review patch. If anyone has any objections, please let me know.
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From: Mika Westerberg mika.westerberg@linux.intel.com
commit f188b99f0b2d33794b4af8a225f95d1e968c0a3f upstream.
HP 6730b laptop has an ethernet NIC connected to one of the PCIe root ports. The root ports themselves are native PCIe hotplug capable. Now, during boot after PCI devices are scanned the BIOS triggers ACPI bus check directly to the NIC:
ACPI: _SB_.PCI0.RP06.NIC_: Bus check in hotplug_event()
It is not clear why it is sending bus check but regardless the ACPI hotplug notify handler calls enable_slot() directly (instead of going through acpiphp_check_bridge() as there is no bridge), which ends up handling special case for non-hotplug bridges with native PCIe hotplug. This results a crash of some kind but the reporter only sees black screen so it is hard to figure out the exact spot and what actually happens. Based on a few fix proposals it was tracked to crash somewhere inside pci_assign_unassigned_bridge_resources().
In any case we should not really be in that special branch at all because the ACPI notify happened to a slot that is not a PCI bridge (it is just a regular PCI device).
Fix this so that we only go to that special branch if we are calling enable_slot() for a bridge (e.g., the ACPI notification was for the bridge).
Link: https://bugzilla.kernel.org/show_bug.cgi?id=201127 Fixes: 84c8b58ed3ad ("ACPI / hotplug / PCI: Don't scan bridges managed by native hotplug") Reported-by: Peter Anemone peter.anemone@gmail.com Signed-off-by: Mika Westerberg mika.westerberg@linux.intel.com Signed-off-by: Bjorn Helgaas bhelgaas@google.com Reviewed-by: Rafael J. Wysocki rafael.j.wysocki@intel.com CC: stable@vger.kernel.org # v4.18+ Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/pci/hotplug/acpiphp_glue.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)
--- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -457,17 +457,18 @@ static void acpiphp_native_scan_bridge(s /** * enable_slot - enable, configure a slot * @slot: slot to be enabled + * @bridge: true if enable is for the whole bridge (not a single slot) * * This function should be called per *physical slot*, * not per each slot object in ACPI namespace. */ -static void enable_slot(struct acpiphp_slot *slot) +static void enable_slot(struct acpiphp_slot *slot, bool bridge) { struct pci_dev *dev; struct pci_bus *bus = slot->bus; struct acpiphp_func *func;
- if (bus->self && hotplug_is_native(bus->self)) { + if (bridge && bus->self && hotplug_is_native(bus->self)) { /* * If native hotplug is used, it will take care of hotplug * slot management and resource allocation for hotplug @@ -701,7 +702,7 @@ static void acpiphp_check_bridge(struct trim_stale_devices(dev);
/* configure all functions */ - enable_slot(slot); + enable_slot(slot, true); } else { disable_slot(slot); } @@ -785,7 +786,7 @@ static void hotplug_event(u32 type, stru if (bridge) acpiphp_check_bridge(bridge); else if (!(slot->flags & SLOT_IS_GOING_AWAY)) - enable_slot(slot); + enable_slot(slot, false);
break;
@@ -973,7 +974,7 @@ int acpiphp_enable_slot(struct acpiphp_s
/* configure all functions */ if (!(slot->flags & SLOT_ENABLED)) - enable_slot(slot); + enable_slot(slot, false);
pci_unlock_rescan_remove(); return 0;