From: qianyi liu liuqianyi125@gmail.com

We leaked last_scheduled fences when the entity was being killed and the fence callback add fails.

To fix this, we should decrement the reference count of prev when dma_fence_add_callback() fails, ensuring proper balance.

v2: * Make commit message more clearly. (Philipp and Matt) * Add "Fixes: " tag and put the stable kernel on Cc. (Philipp) * Correct subject line from "drm/scheduler" to "drm/sched". (Philipp)

Cc: stable@vger.kernel.org Fixes: 2fdb8a8f07c2 ("drm/scheduler: rework entity flush, kill and fini")

Signed-off-by: qianyi liu liuqianyi125@gmail.com --- drivers/gpu/drm/scheduler/sched_entity.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c index 69bcf0e99d57..1c0c14bcf726 100644 --- a/drivers/gpu/drm/scheduler/sched_entity.c +++ b/drivers/gpu/drm/scheduler/sched_entity.c @@ -259,9 +259,12 @@ static void drm_sched_entity_kill(struct drm_sched_entity *entity) struct drm_sched_fence *s_fence = job->s_fence;

dma_fence_get(&s_fence->finished); - if (!prev || dma_fence_add_callback(prev, &job->finish_cb, - drm_sched_entity_kill_jobs_cb)) + if (!prev || + dma_fence_add_callback(prev, &job->finish_cb, + drm_sched_entity_kill_jobs_cb)) { + dma_fence_put(prev); drm_sched_entity_kill_jobs_cb(NULL, &job->finish_cb); + }

prev = &s_fence->finished; }