On Sun Jun 28, 2026 at 11:53 PM JST, Danilo Krummrich wrote: > DRM ioctls do not guarantee that the parent bus device is still bound. > However, since DRM device registration is managed through Devres, using > drm_dev_unplug() on unregistration ensures that between drm_dev_enter() > and drm_dev_exit() the parent device must be bound. > > Add RegistrationGuard, a guard object representing a drm_dev_enter/exit > SRCU critical section that dereferences to &Device<T, Registered>. The > guard is obtained from Device<T, Ioctl> and proves at runtime that the > device is still registered. > > Switch Registration::drop from drm_dev_unregister() to drm_dev_unplug() > to provide the SRCU barrier that RegistrationGuard's safety argument > relies on. > > Reviewed-by: Lyude Paul <[email protected]> > Signed-off-by: Danilo Krummrich <[email protected]>
Reviewed-by: Alexandre Courbot <[email protected]>
