[Intel-gfx] [PATCH 2/2] dma-buf: fix dma-fence-chain out of order test

[Chris Wilson]

Quoting Lionel Landwerlin (2020-06-25 13:34:43)
> There was probably a misunderstand on how the dma-fence-chain is
> supposed to work or what dma_fence_chain_find_seqno() is supposed to
> return.
> 
> dma_fence_chain_find_seqno() is here to give us the fence to wait upon
> for a particular point in the timeline. The timeline progresses only
> when all the points prior to a given number have completed.

Hmm, the question was what point is it supposed to wait for.

For the simple chain of [1, 3], does 1 being signaled imply that all
points up to 3 are signaled, or does 3 not being signaled imply that all
points after 1 are not. If that's mentioned already somewhere, my bad.
If not, could you put the answer somewhere.
-Chris