ppp: define reusable device creation functions
Move PPP device initialisation and registration out of ppp_create_interface(). This prepares code for device registration with rtnetlink. While there, simplify the prototype of ppp_create_interface(): * Since ppp_dev_configure() takes care of setting file->private_data, there's no need to return a ppp structure to ppp_unattached_ioctl() anymore. * The unit parameter is made read/write so that ppp_create_interface() can tell which unit number has been assigned. Signed-off-by: Guillaume Nault <g.nault@alphalink.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
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