Dan Williams, Red Hat collaborator and NetworkManager developer, might be upset but doesn't let it get to him. In the GNOME blog, he advises "just say no" to WiFi drivers in the linux-staging tree and recommends changes.
The reason for Williams's concern is that apparently none of the WiFi drivers in the linux-staging tree will detect access points with hidden SSIDs, partly because they don't set the IW_SCAN_CAPA_ESSID capability bit. Plus the popular Ralink drivers found in many netbooks don't have SSID scanning capability at all in staging.
Williams complains in his blog that he had added the IW_SCAN_CAPA_ESSID capability patch to wireless extensions two years ago and no one seems to have worked with the community to include the patch.
Rest Here