Why so many people see letter as containing onlt 3 words and ignore part where Linus says that maintainer shouldn’t randomly blame userspace, how unrelated error code is(it’s like if your router crashed with message “there is no milk in the fridge”), repeats that maintainer shouldn’t randomly blame userspace, asks if patch good enough, says “WE DO NOT BREAK USERSPACE”,
I’m angry, because your whole email was so horribly wrong, and the patch that broke things was so obviously crap.
The fact that you then try to make excuses for breaking user space, and blaming some external program that used to work, is just shameful. It’s not how we work.
ENOENT is not a valid error return from an ioctl. Never has been, never will be. ENOENT means “No such file and directory”, and is for path operations. ioctl’s are done on files that have already been opened, there’s no way in hell that ENOENT would ever be valid.