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Make Ioctl handlers receive a &Device<T, Registered> reference, proving at the type level that the device is registered and its parent bus device is bound. This is achieved by calling registration_guard() on the Device<T, Ioctl> obtained in ioctl dispatch context. If the device has been unplugged, the ioctl returns -ENODEV without calling the handler. To resolve the driver type parameter T for type inference, which the compiler cannot propagate through method resolution and associated-type projections alone, a dead-code closure and a helper function are used as a type-inference anchor. Reviewed-by: Lyude Paul <lyude@redhat.com> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Tested-by: Deborah Brouwer <deborah.brouwer@collabora.com> Link: https://patch.msgid.link/20260628145406.2107056-14-dakr@kernel.org [ Use imperative mood in commit message; clarify __dev_ctx_cast() doc comment to reflect Ioctl-to-Registered cast. - Danilo ] Signed-off-by: Danilo Krummrich <dakr@kernel.org>