drm/i915: Don't let an oops get triggered from irq_emit without dma init.

Userland is broken if it's trying this, but we also shouldn't allow oopses.

Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index ee7ce7b78cf79b9dd0d18033866c83fd2d060d1e..98bb4c878c4ef892a5aeb42b64a335e95eb45b24 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -406,7 +406,7 @@ int i915_irq_emit(struct drm_device *dev, void *data,
        drm_i915_irq_emit_t *emit = data;
        int result;
 
-       if (!dev_priv) {
+       if (!dev_priv || !dev_priv->ring.virtual_start) {
                DRM_ERROR("called with no initialization\n");
                return -EINVAL;
        }