Re: [PATCH v2 2/2] drm/sched: Protect entity->last_scheduled with spinlock

[Philipp Stanner]

On Thu, 2026-08-13 at 11:25 +0200, Philipp Stanner wrote:
> 
> +	drm_sched_rq_pop_entity(entity);
> +	spin_unlock(&entity->lock);
>  
>  	spsc_queue_pop(&entity->job_queue);
>  
> -	spin_lock(&entity->lock);
> -	drm_sched_rq_pop_entity(entity);
> -	spin_unlock(&entity->lock);
> +	dma_fence_put(prev_last_scheduled);


The relative order between these must not be changed. My bad.

So unfortunately it looks as if at least locking spsc_queue here is
necessary. I really wished someone could pick up our spsc_queue locking
TODO.


P.