[PATCH 1/5] drm/i915: downgrade non-lethal BUG_ONs

[Daniel Vetter <daniel.vetter@ffwll.ch>]

If it's a simple gem accounting error that won't lead to immediate harm
(like a NULL-deref) or is a simple violation of a required invariant
that the caller should always check/ensure, downgrade the BUG_ON to
a WARN_ON and hope the system survives long enough to grab the dmesg.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/i915_gem.c            |    6 +++---
 drivers/gpu/drm/i915/i915_gem_evict.c      |    4 ++--
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |    4 ++--
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index ae40272..1ef0b91 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1748,7 +1748,7 @@ i915_gem_object_move_to_flushing(struct drm_i915_gem_object *obj)
 	struct drm_device *dev = obj->base.dev;
 	drm_i915_private_t *dev_priv = dev->dev_private;
 
-	BUG_ON(!obj->active);
+	WARN_ON(!obj->active);
 	list_move_tail(&obj->mm_list, &dev_priv->mm.flushing_list);
 
 	i915_gem_object_move_off_active(obj);
@@ -1765,8 +1765,8 @@ i915_gem_object_move_to_inactive(struct drm_i915_gem_object *obj)
 	else
 		list_move_tail(&obj->mm_list, &dev_priv->mm.inactive_list);
 
-	BUG_ON(!list_empty(&obj->gpu_write_list));
-	BUG_ON(!obj->active);
+	WARN_ON(!list_empty(&obj->gpu_write_list));
+	WARN_ON(!obj->active);
 	obj->ring = NULL;
 
 	i915_gem_object_move_off_active(obj);
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index da05a26..db62fae 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -136,7 +136,7 @@ i915_gem_evict_something(struct drm_device *dev, int min_size,
 				       exec_list);
 
 		ret = drm_mm_scan_remove_block(obj->gtt_space);
-		BUG_ON(ret);
+		WARN_ON(ret);
 
 		list_del_init(&obj->exec_list);
 		drm_gem_object_unreference(&obj->base);
@@ -199,7 +199,7 @@ i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only)
 	if (ret)
 		return ret;
 
-	BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
+	WARN_ON(!list_empty(&dev_priv->mm.flushing_list));
 
 	return i915_gem_evict_inactive(dev, purgeable_only);
 }
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 316603e..8cac87c 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1093,7 +1093,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 								&objects, eb,
 								exec,
 								args->buffer_count);
-			BUG_ON(!mutex_is_locked(&dev->struct_mutex));
+			WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 		}
 		if (ret)
 			goto err;
@@ -1122,7 +1122,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 			if (ret)
 				goto err;
 
-			BUG_ON(ring->sync_seqno[i]);
+			WARN_ON(ring->sync_seqno[i]);
 		}
 	}
 
-- 
1.7.4.1