From: Rafael J. Wysocki <[email protected]> Multiple race conditions are possible between the addition and removal of PCI devices during ACPI PCI host bridge hotplug and the generic PCI bus rescan and device removal that can be triggered via sysfs.
To avoid those race conditions make the ACPI PCI host bridge addition and removal code use global PCI rescan-remove locking. Signed-off-by: Rafael J. Wysocki <[email protected]> --- drivers/acpi/pci_root.c | 6 ++++++ 1 file changed, 6 insertions(+) Index: linux-pm/drivers/acpi/pci_root.c =================================================================== --- linux-pm.orig/drivers/acpi/pci_root.c +++ linux-pm/drivers/acpi/pci_root.c @@ -604,7 +604,9 @@ static int acpi_pci_root_add(struct acpi pci_assign_unassigned_root_bus_resources(root->bus); } + pci_lock_rescan_remove(); pci_bus_add_devices(root->bus); + pci_unlock_rescan_remove(); return 1; end: @@ -616,6 +618,8 @@ static void acpi_pci_root_remove(struct { struct acpi_pci_root *root = acpi_driver_data(device); + pci_lock_rescan_remove(); + pci_stop_root_bus(root->bus); device_set_run_wake(root->bus->bridge, false); @@ -623,6 +627,8 @@ static void acpi_pci_root_remove(struct pci_remove_root_bus(root->bus); + pci_unlock_rescan_remove(); + kfree(root); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
