From: Jani Nikula <jani.nikula@intel.com>
Date: Thu, 2 Jul 2015 14:43:21 +0000 (+0300)
Subject: drm/i915/opregion: use BUILD_BUG_ON to verify mailbox struct sizes
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=2d80391d36e698e8dabc3b3ff0969fc6fde156c4;p=openwrt%2Fstaging%2Fblogic.git

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 71e87abdcae7..c4756a2d77bb 100644
--- 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) {