Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [Update][PATCH 3/6] ACPI / hotplug: Fix handle_root_bridge_removal() | Date | Mon, 04 Nov 2013 14:33:09 +0100 |
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
It is required to do get_device() on the struct acpi_device in question before passing it to acpi_bus_hot_remove_device() through acpi_os_hotplug_execute(), because acpi_bus_hot_remove_device() calls acpi_scan_hot_remove() that does put_device() on that object.
The ACPI PCI root removal routine, handle_root_bridge_removal(), doesn't do that, which may lead to premature freeing of the device object or to executing put_device() on an object that has been freed already.
Fix this problem by making handle_root_bridge_removal() use get_device() as appropriate.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> --- drivers/acpi/pci_root.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
Index: linux-pm/drivers/acpi/pci_root.c =================================================================== --- linux-pm.orig/drivers/acpi/pci_root.c +++ linux-pm/drivers/acpi/pci_root.c @@ -608,9 +608,12 @@ static void handle_root_bridge_removal(s ej_event->device = device; ej_event->event = ACPI_NOTIFY_EJECT_REQUEST; + get_device(&device->dev); status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event); - if (ACPI_FAILURE(status)) + if (ACPI_FAILURE(status)) { + put_device(&device->dev); kfree(ej_event); + } } static void _handle_hotplug_event_root(struct work_struct *work)
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