Change Details

Create an API to take and drop the topo lock needed to manage the newbus tree (bus_topo_lock() and bus_topo_unlock()). Add bus_topo_mtx() to return this mutext (current Giant but soon to be an SX lock I think). (also seems to have the following mixed in, will separate out shortly push down Giant into mii_attach() and use new bus_topo functions. Several drivers do a deferred attach of the mii bus and takeout and drop Giant to do that. This is undesirable, so push the giant use down into mii where we can more easily change it.) Sponsored by: Netflix

Create an API to take and drop the topo lock needed to manage the newbus tree (bus_topo_lock() and bus_topo_unlock()). Add bus_topo_mtx() to return this mutext (current Giant but soon to be an SX lock I think). Sponsored by: Netflix

Create an API to take and drop the topo lock needed to manage the newbus tree (bus_topo_lock() and bus_topo_unlock()). Add bus_topo_mtx() to return this mutext (current Giant but soon to be an SX lock I think). (also seems to have the following mixed in, will separate out shortly push down Giant into mii_attach() and use new bus_topo functions. Several drivers do a deferred attach of the mii bus and takeout and drop Giant to do that. This is undesirable, so push the giant use down into mii where we can more easily change it.) Sponsored by: Netflix