Fix a NULL dereference if drm fails to attach.

There's probably something better to be done, but we should at least
boot if this happens now.

1 files changed, 4 insertions, 0 deletions

diff --git a/sys/dev/pci/drm/i915_drv.c b/sys/dev/pci/drm/i915_drv.c
index 8eb0cdf200f..6fb20fed36a 100644
--- a/sys/dev/pci/drm/i915_drv.c
+++ b/sys/dev/pci/drm/i915_drv.c
@@ -3922,6 +3922,10 @@ i915_gem_idle(struct inteldrm_softc *dev_priv)
 	struct drm_device	*dev = (struct drm_device *)dev_priv->drmdev;
 	int			 ret;
 
+	/* If drm attach failed */
+	if (dev == NULL)
+		return (0);
+
 	DRM_LOCK();
 	if (dev_priv->mm.suspended || dev_priv->ring.ring_obj == NULL) {
 		DRM_UNLOCK();