[Linaro-mm-sig] Re: [PATCH] dma-fence: allow dma fence to have their own lock

On (22/05/30 16:55), Christian König wrote:

Am 30.05.22 um 16:22 schrieb Sergey Senozhatsky:

...

[SNIP] So the `lock` should have at least same lifespan as the DMA fence that borrows it, which is impossible to guarantee in our case.

Nope, that's not correct. The lock should have at least same lifespan as the context of the DMA fence.

How does one know when it's safe to release the context? DMA fence objects are still transparently refcount-ed and "live their own lives", how does one synchronize lifespans?