On the hunt for an indefinite __wait_seqno() the most likely cause being asked to wait upon a future seqno, we can lay a trap and see if anything gets caught. Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk> --- 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 39de523..b2effab 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1118,6 +1118,12 @@ static int __wait_seqno(struct intel_ring_buffer *ring, u32 seqno, bool wait_forever = true; int ret; + if (WARN_ON(!i915_seqno_passed(list_entry(ring->request_list.prev, + struct drm_i915_gem_request, + list)->seqno, + seqno))) + return -EDEADLK; + if (i915_seqno_passed(ring->get_seqno(ring, true), seqno)) return 0; -- 1.7.10.4
