drm/i915/opregion: make VBT size limit more strict

The VBT in OpRegion should fit in mailbox #4.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/4bdb3f5820e3dbd1cdfa7b65cadfce4f80b880f0.1450089383.git.jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index 859c9ac..1c8dfc9 100644 (file)
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -988,7 +988,7 @@ int intel_opregion_setup(struct drm_device *dev)
 
        if (!dmi_check_system(intel_no_opregion_vbt)) {
                void *vbt = base + OPREGION_VBT_OFFSET;
-               u32 vbt_size = OPREGION_SIZE - OPREGION_VBT_OFFSET;
+               u32 vbt_size = OPREGION_ASLE_EXT_OFFSET - OPREGION_VBT_OFFSET;
 
                if (intel_bios_is_valid_vbt(vbt, vbt_size)) {
                        DRM_DEBUG_KMS("Found valid VBT in ACPI OpRegion\n");