On 10/17/25 6:37 PM, Jason Gunthorpe wrote: > On Fri, Oct 17, 2025 at 06:29:10PM +0200, Danilo Krummrich wrote: > >> I'm not sure about MISC device though. Unless there's a good reason, >> I think MISC device should be "fenced" instead. > > misc is a very small wrapper around raw fops, and raw fops are > optimized for performance. Adding locking that many important things > like normal files don't need to all fops would not be agreed. > > The sketch in this series where we have a core helper to provide a > shim fops that adds on the lock is smart and I think could be an > agreeable way to make a synchronous misc and cdev unregister for > everyone to trivially use.
Sure, for MISC devices without a parent for instance there are no device resources to access anyways.
