From: Rafael J. Wysocki Date: Thu, 7 Nov 2013 00:41:01 +0000 (+0100) Subject: ACPI / scan: Start matching drivers after trying scan handlers X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6931007cc90b;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git ACPI / scan: Start matching drivers after trying scan handlers ACPI scan handlers should always be attached to struct acpi_device objects before any ACPI drivers, but there is a window during which a driver may be attached to a struct acpi_device before checking if there is a matching scan handler. Namely, that will happen if an ACPI driver module is loaded during acpi_bus_scan() right after the first namespace walk is complete and before the given device is processed by the second namespace walk. To prevent that from happening, set the match_driver flags of struct acpi_device objects right before running device_attach() for them in acpi_bus_device_attach(). Signed-off-by: Rafael J. Wysocki Acked-by: Toshi Kani --- diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index fbdb82e70d10..4d377a22622a 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1677,7 +1677,6 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, void acpi_device_add_finalize(struct acpi_device *device) { - device->flags.match_driver = true; dev_set_uevent_suppress(&device->dev, false); kobject_uevent(&device->dev.kobj, KOBJ_ADD); } @@ -1916,8 +1915,12 @@ static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used, return AE_OK; ret = acpi_scan_attach_handler(device); - if (ret) - return ret > 0 ? AE_OK : AE_CTRL_DEPTH; + if (ret < 0) + return AE_CTRL_DEPTH; + + device->flags.match_driver = true; + if (ret > 0) + return AE_OK; ret = device_attach(&device->dev); return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;