staging: comedi: make attach handler optional
Some low-level Comedi drivers no longer support manual configuration of devices with the COMEDI_DEVCONFIG ioctl (used by the comedi_config program). For those drivers, the 'attach_pci' or 'attach_usb' handler will be set in the struct comedi_driver to configure devices automatically (via comedi_pci_auto_config() or comedi_usb_auto_config()). Their 'attach' handlers are redundant but the the comedi core module currently requires it to be set. Make the 'attach' handler optional and issue a warning if something wants to call it. Signed-off-by:Ian Abbott <abbotti@mev.co.uk> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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