drm/i915/opregion: use BUILD_BUG_ON to verify mailbox struct sizes

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index 71e87ab..c4756a2 100644 (file)
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -862,6 +862,11 @@ int intel_opregion_setup(struct drm_device *dev)
        char buf[sizeof(OPREGION_SIGNATURE)];
        int err = 0;
 
+       BUILD_BUG_ON(sizeof(struct opregion_header) != 0x100);
+       BUILD_BUG_ON(sizeof(struct opregion_acpi) != 0x100);
+       BUILD_BUG_ON(sizeof(struct opregion_swsci) != 0x100);
+       BUILD_BUG_ON(sizeof(struct opregion_asle) != 0x100);
+
        pci_read_config_dword(dev->pdev, PCI_ASLS, &asls);
        DRM_DEBUG_DRIVER("graphic opregion physical addr: 0x%x\n", asls);
        if (asls == 0) {