This forces a WARN_ON in a otherwise undebuggable path. When the
WARN_ON triggers we don't have a work item to unpin, which results
in a leak that triggers when the framebuffer is freed, much later on.
It's very hard to find the leak afterwards, so add some debugging for this case.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9bf737f856c7..62c91171900a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13463,11 +13463,20 @@ intel_prepare_plane_fb(struct drm_plane *plane,
struct intel_plane *intel_plane = to_intel_plane(plane);
struct drm_i915_gem_object *obj = intel_fb_obj(fb);
struct drm_i915_gem_object *old_obj = intel_fb_obj(plane->state->fb);
+ struct drm_crtc *crtc = new_state->crtc ?: plane->state->crtc;
int ret = 0;
if (!obj && !old_obj)
return 0;
+ if (WARN_ON(!new_state->state) || WARN_ON(!crtc) ||
+ WARN_ON(!to_intel_atomic_state(new_state->state)->work[to_intel_crtc(crtc)->pipe])) {
+ if (WARN_ON(old_obj != obj))
+ return -EINVAL;
+
+ return 0;
+ }
+
if (old_obj) {
struct drm_crtc_state *crtc_state =
drm_atomic_get_existing_crtc_state(new_state->state, plane->state->crtc);
--
2.1.0
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