[PATCH 1/3] dma-buf: add dma_fence_get_stub

[Eric Anholt]

Christian König <ckoenig.leichtzumerken at gmail.com> writes:

> Extract of useful code from the timeline work. This provides a function
> to return a stub or dummy fence which is always signaled.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>
> ---
>  drivers/dma-buf/dma-fence.c | 36 +++++++++++++++++++++++++++++++++++-
>  include/linux/dma-fence.h   |  1 +
>  2 files changed, 36 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
> index 1551ca7df394..136ec04d683f 100644
> --- a/drivers/dma-buf/dma-fence.c
> +++ b/drivers/dma-buf/dma-fence.c

>  /*
>   * fence context counter: each execution context should have its own
>   * fence context, this allows checking if fences belong to the same
>   * context or not. One device can have multiple separate contexts,
>   * and they're used if some engine can run independently of another.
>   */
> -static atomic64_t dma_fence_context_counter = ATOMIC64_INIT(0);
> +static atomic64_t dma_fence_context_counter = ATOMIC64_INIT(1);

What's this change for?  I don't see a context allocation in patch #2
where the stub fence is being moved from, so this seems out of place.
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