From: "Yang, Dong" <dong.yang@xxxxxxxxx> With unknow race condition, the i915_request will be added to intel_context list twice, and result in system panic. If node alreay exist then do not add it again. Signed-off-by: Yang, Dong <dong.yang@xxxxxxxxx> --- drivers/gpu/drm/i915/gt/intel_breadcrumbs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c index 209cf265bf74..9c7bc060d2ae 100644 --- a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c +++ b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c @@ -387,6 +387,9 @@ static void insert_breadcrumb(struct i915_request *rq) } } + if (&rq->signal_link == pos) + return; + i915_request_get(rq); list_add_rcu(&rq->signal_link, pos); GEM_BUG_ON(!check_signal_order(ce, rq)); -- 2.27.0
