Hello Wolfram, On 21/05/2022 11:50, Wolfram Sang wrote: >> + /* >> + * We drop the mutex here, because device unregister >> + * will take sysfs lock (kn->count) which, as LOCKDEP >> + * would think, depends on this mutex >> + */ > I have to ask: can't lockdep be fixed or the lock somehow be annotated > to prevent the false positive? I would be happy to test any other proposal, I personally didn't find other working approach until now. This particular patch actually has an advantage of reducing the locked region, which makes sense if only userspace_clients is protected by the mutex. -- Best regards, Alexander Sverdlin.
