Chris Wilson <[email protected]> writes:

> If the tasklet is not being used, don't try and flush it.
>
> Fixes: 594893870044 ("drm/i915/gt: Add a safety submission flush in the 
> heartbeat")
> Signed-off-by: Chris Wilson <[email protected]>
> Cc: Mika Kuoppala <[email protected]>

Reviewed-by: Mika Kuoppala <[email protected]>

> ---
>  drivers/gpu/drm/i915/gt/intel_engine_cs.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c 
> b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> index 31049e0bdb57..045179c65c44 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> @@ -1094,6 +1094,9 @@ void intel_engine_flush_submission(struct 
> intel_engine_cs *engine)
>  {
>       struct tasklet_struct *t = &engine->execlists.tasklet;
>  
> +     if (!t->func)
> +             return;
> +
>       /* Synchronise and wait for the tasklet on another CPU */
>       tasklet_kill(t);
>  
> -- 
> 2.20.1
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