drm/i915: Assert that the active request hasn't been signaled

As the request is not complete, it should not be signaled. Assert that
this is true before we process the request for a reset.

References: https://bugs.freedesktop.org/show_bug.cgi?id=99671
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170212172002.23072-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index b8d869d..48922ff 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2611,6 +2611,8 @@ i915_gem_find_active_request(struct intel_engine_cs *engine)
                        continue;
 
                GEM_BUG_ON(request->engine != engine);
+               GEM_BUG_ON(test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
+                                   &request->fence.flags));
                return request;
        }