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>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index ee7ce7b78cf7..98bb4c878c4e 100644
--- 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;
         }