[Intel-gfx] [PATCH] drm/i915: prevent crash with .disable_display parameter

[clinton.a.taylor at intel.com]

From: Clint Taylor <clinton.a.taylor at intel.com>

The .disable_display parameter was causing a fatal crash when fbdev was
dereferenced during driver init.

Signed-off-by: Clint Taylor <clinton.a.taylor at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 4e5ea58..b2a9195 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1140,7 +1140,9 @@ static void i915_driver_register(struct drm_i915_private *dev_priv)
 	 * irqs are fully enabled. We do it last so that the async config
 	 * cannot run before the connectors are registered.
 	 */
-	intel_fbdev_initial_config_async(dev);
+	if (dev_priv->fbdev) {
+		intel_fbdev_initial_config_async(dev);
+	}
 }
 
 /**
-- 
1.7.9.5