[PATCH 1/2] Revert "dma-buf: Report signaled links inside dma-fence-chain"

[Christian König]

Am 02.07.20 um 10:26 schrieb Lionel Landwerlin:
> On 25/06/2020 15:43, Christian König wrote:
>> Am 25.06.20 um 14:34 schrieb Lionel Landwerlin:
>>> This reverts commit 5de376bb434f80a13138f0ebedc8351ab73d8b0d.
>>>
>>> This change breaks synchronization of a timeline.
>>> dma_fence_chain_find_seqno() might be a bit of a confusing name but
>>> this function is not trying to find a particular seqno, is supposed to
>>> give a fence to wait on for a particular point in the timeline.
>>>
>>> In a timeline, a particular value is reached when all the points up to
>>> and including that value have signaled.
>>>
>>> Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
>>
>> Reviewed-by: Christian König <christian.koenig at amd.com>
>
>
> Now that you are a maintainer, feel free to merge this and the test 
> changes.

Sure, I will pick that up later today :)

Christian.

>
>
> Thanks,
>
>
> -Lionel
>
>
>>
>>> ---
>>>   drivers/dma-buf/dma-fence-chain.c | 7 -------
>>>   1 file changed, 7 deletions(-)
>>>
>>> diff --git a/drivers/dma-buf/dma-fence-chain.c 
>>> b/drivers/dma-buf/dma-fence-chain.c
>>> index c435bbba851c..3d123502ff12 100644
>>> --- a/drivers/dma-buf/dma-fence-chain.c
>>> +++ b/drivers/dma-buf/dma-fence-chain.c
>>> @@ -99,12 +99,6 @@ int dma_fence_chain_find_seqno(struct dma_fence 
>>> **pfence, uint64_t seqno)
>>>           return -EINVAL;
>>>         dma_fence_chain_for_each(*pfence, &chain->base) {
>>> -        if ((*pfence)->seqno < seqno) { /* already signaled */
>>> -            dma_fence_put(*pfence);
>>> -            *pfence = NULL;
>>> -            break;
>>> -        }
>>> -
>>>           if ((*pfence)->context != chain->base.context ||
>>>               to_dma_fence_chain(*pfence)->prev_seqno < seqno)
>>>               break;
>>> @@ -228,7 +222,6 @@ EXPORT_SYMBOL(dma_fence_chain_ops);
>>>    * @chain: the chain node to initialize
>>>    * @prev: the previous fence
>>>    * @fence: the current fence
>>> - * @seqno: the sequence number (syncpt) of the fence within the chain
>>>    *
>>>    * Initialize a new chain node and either start a new chain or add 
>>> the node to
>>>    * the existing chain of the previous fence.
>>
>