Re: io_uring_prep_timeout_update on linked timeouts

[Victor Stewart <v@nametag.social>]

> > _Not tested_, but something like below should do. will get it
> > done properly later, but even better if we already have a test
> > case. Victor?

sorry been traveling! i can extract out a simple test today...

> FWIW, I wrote a simple test case for it, and it seemed to work fine.
> Nothing fancy, just a piped read that would never finish with a linked
> timeout (1s), submit, then submit a ltimeout update that changes it to
> 2s instead. Test runs and update completes first with res == 0 as
> expected, and 2s later the ltimeout completes with -EALREADY (because
> the piped read went async) and the piped read gets canceled.

...unless?