[Intel-gfx] [PATCH 47/66] drm/i915: Fix context fini refcounts

[Ben Widawsky]

With multiple rings having a last context, we must now unreference these
contexts.

This could be squashed if desired since it leaves the last patch broken.
However, because it was a bit tricky to catch, I've left it separated
for primarily review purposed

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_gem_context.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 74714e56..3e0413e 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -291,6 +291,7 @@ void i915_gem_context_fini(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct i915_hw_context *dctx = dev_priv->ring[RCS].default_context;
+	int i;
 
 	if (dev_priv->hw_contexts_disabled)
 		return;
@@ -312,12 +313,20 @@ void i915_gem_context_fini(struct drm_device *dev)
 		WARN_ON(i915_gem_object_is_active(dctx->obj));
 		i915_gem_object_unpin(dctx->obj);
 		i915_gem_context_unreference(dctx);
+		dev_priv->ring[RCS].last_context = NULL;
+	}
+
+	for (i = 0; i < I915_NUM_RINGS; i++) {
+		struct intel_ring_buffer *ring = &dev_priv->ring[i];
+		if (!(INTEL_INFO(dev)->ring_mask & (1<<i)))
+			continue;
+		if (ring->last_context)
+			i915_gem_context_unreference(ring->last_context);
+		ring->default_context = NULL;
 	}
 
 	i915_gem_object_unpin(dctx->obj);
 	WARN_ON(!i915_gem_context_unreference(dctx));
-	dev_priv->ring[RCS].default_context = NULL;
-	dev_priv->ring[RCS].last_context = NULL;
 	dev_priv->gtt.aliasing_ppgtt = NULL;
 }
 
-- 
1.8.3.1