On Fri, 28 Feb 2025 at 11:49, Timur Tabi <ttabi@xxxxxxxxxx> wrote: > > On Fri, 2025-02-28 at 07:37 +1000, Dave Airlie wrote: > > I've tried to retrofit checking 0xffffffff to drivers a lot, I'd > > prefer not to. Drivers getting stuck in wait for clear bits for ever. > > That's what read_poll_timeout() is for. I'm surprised Nouveau doesn't use it. That doesn't handle the PCIE returns 0xffffffff case at all, which is the thing we most want to handle, it also uses the CPU timer whereas nouveau's wait infrastructure uses the GPU timer usually (though that could be changed). Dave.
