From: Rafael J. Wysocki Date: Thu, 7 Nov 2013 00:41:27 +0000 (+0100) Subject: ACPI / hotplug: Fix handle_root_bridge_removal() X-Git-Tag: v3.13-rc1~28^2^2~11 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=2441191a19039002b2c454a261fb45986df15184;p=uclinux-h8%2Flinux.git ACPI / hotplug: Fix handle_root_bridge_removal() 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 Acked-by: Toshi Kani Cc: All applicable --- diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index d3874f425653..d7e53ea53d6c 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -608,9 +608,12 @@ static void handle_root_bridge_removal(struct acpi_device *device) 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)