tree 0770800533747eac02405fc01007cf719e0406f3
parent 6e1ee5d2e9e411892b5d84e3ea93e3fc88ac786c
author Johannes Berg <johannes.berg@intel.com> 1395680247 +0100
committer Johannes Berg <johannes.berg@intel.com> 1397033728 +0200

cfg80211: allow userspace to take ownership of interfaces

When dynamically creating interfaces from userspace, e.g. for P2P usage,
such interfaces are usually owned by the process that created them, i.e.
wpa_supplicant. Should wpa_supplicant crash, such interfaces will often
cease operating properly and cause problems on restarting the process.

To avoid this problem, introduce an ownership concept for interfaces. If
an interface is owned by a netlink socket, then it will be destroyed if
the netlink socket is closed for any reason, including if the process it
belongs to crashed. This gives us a race-free way to get rid of any such
interfaces.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>