drm/amdgpu: fix another missing fence reference in the CS code

drm_sched_job_add_dependency() consumes the references of the gang
members. Only triggered by mesh shaders.

Signed-off-by: Christian König <[email protected]>
Fixes: 1728baa ("drm/amdgpu: use scheduler dependencies for CS")
Tested-by: Mike Lothian <[email protected]>
Tested-by: Bert Karwatzki <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Alex Deucher <[email protected]>
Reviewed-by: Luben Tuikov <[email protected]>

Author: ChristianKoenigAMD

drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c

@@ -1254,9 +1254,12 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
 			continue;
 
 		fence = &p->jobs[i]->base.s_fence->scheduled;
+		dma_fence_get(fence);
 		r = drm_sched_job_add_dependency(&leader->base, fence);
-		if (r)
+		if (r) {
+			dma_fence_put(fence);
 			goto error_cleanup;
+		}
 	}
 
 	if (p->gang_size > 1) {