decnet: take dst->__refcnt when struct dn_route is created
struct dn_route is inserted into dn_rt_hash_table but no dst->__refcnt is taken. This patch makes sure the dn_rt_hash_table's reference to the dst is ref counted. As the dst is always ref counted properly, we can safely mark DST_NOGC flag so dst_release() will release dst based on refcnt only. And dst gc is no longer needed and all dst_free() or its related function calls should be replaced with dst_release() or dst_release_immediate(). And dst_dev_put() is called when removing dst from the hash table to release the reference on dst->dev before we lose pointer to it. Also, correct the logic in dn_dst_check_expire() and dn_dst_gc() to check dst->__refcnt to be > 1 to indicate it is referenced by other users. Signed-off-by: Wei Wang <weiwan@google.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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