[PATCH] drm/i915: don't leak global_timeline

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We need to clean up the global_timeline in i915_gem_load_cleanup.

v2: don't forget about the struct_mutex, and also WARN_ON if we have any
remaining timelines before purging the global_timeline.

v3: it might be a good idea to first remove the global_timeline...duh!

Fixes: 73cb97010d4f ("drm/i915: Combine seqno + tracking into a global timeline struct")
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_gem.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 3fb5e66e4d65..b7a8c8349ccb 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4557,6 +4557,12 @@ void i915_gem_load_cleanup(struct drm_device *dev)
 
 	WARN_ON(!llist_empty(&dev_priv->mm.free_list));
 
+	mutex_lock(&dev_priv->drm.struct_mutex);
+	i915_gem_timeline_fini(&dev_priv->gt.global_timeline);
+	mutex_unlock(&dev_priv->drm.struct_mutex);
+
+	WARN_ON(!list_empty(&dev_priv->gt.timelines));
+
 	kmem_cache_destroy(dev_priv->dependencies);
 	kmem_cache_destroy(dev_priv->requests);
 	kmem_cache_destroy(dev_priv->vmas);
-- 
2.7.4

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