Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> The name very often may be freed independently of the fence, with the
> only protection being RCU. To be safe as we read the names, hold RCU.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_sw_fence.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c b/drivers/gpu/drm/i915/i915_sw_fence.c
> index 2744558f3050..dfabf291e5cd 100644
> --- a/drivers/gpu/drm/i915/i915_sw_fence.c
> +++ b/drivers/gpu/drm/i915/i915_sw_fence.c
> @@ -430,11 +430,13 @@ static void timer_i915_sw_fence_wake(struct timer_list *t)
> if (!fence)
> return;
>
> + rcu_read_lock();
> pr_notice("Asynchronous wait on fence %s:%s:%llx timed out (hint:%ps)\n",
> cb->dma->ops->get_driver_name(cb->dma),
> cb->dma->ops->get_timeline_name(cb->dma),
> cb->dma->seqno,
> i915_sw_fence_debug_hint(fence));
> + rcu_read_unlock();
>
> i915_sw_fence_set_error_once(fence, -ETIMEDOUT);
> i915_sw_fence_complete(fence);
> --
> 2.20.1
>
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