On Thu, 13 Oct 2011, Grant Likely wrote: > > However it's worth pointing out right at the start that we already have > > device_pm_move_before(), device_pm_move_after(), and > > device_pm_move_last(). They are intended specifically to provide > > drivers with a way of making sure that dpm_list is in the right order > > -- people have been aware of these issues for some time. > > I saw those. I also notice that they are only used by device_move() > when reparenting a device (which is another wrinkle I hadn't though > about). Reparenting a device becomes problematic if the probe order > is also represented in the list. If device_move() gets called, then > any implicit probe-order sorting for that device would be lost. > > I also notice that device_move disregards any children when moving a > device, which could also be a problem. > > Although it looks like the only users of device_move are: > > drivers/media/video/pvrusb2/pvrusb2-v4l2.c > drivers/s390/cio/device.c > net/bluetooth/hci_sysfs.c > net/bluetooth/rfcomm/tty.c > > So it may not be significant to adapt. I trust that very little will be needed. I haven't checked the existing callers, but it's reasonable to require that a device being moved not have any children. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
