From: qianyi liu <liuqianyi125@xxxxxxxxx>
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@xxxxxxxxxxxxxxx
Fixes: 2fdb8a8f07c2 ("drm/scheduler: rework entity flush, kill and fini")
Signed-off-by: qianyi liu <liuqianyi125@xxxxxxxxx>
---
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;
}
--
2.25.1
