tree b2c087fe536127cf30639a773a8da78452994041
parent 1298ca4671acb10310baa550ed044c553e3a3387
author Patrick McHardy <kaber@trash.net> 1366181220 +0000
committer David S. Miller <davem@davemloft.net> 1366397877 -0400

netlink: add netlink_skb_set_owner_r()

For mmap'ed I/O a netlink specific skb destructor needs to be invoked
after the final kfree_skb() to clean up state. This doesn't work currently
since the skb's ownership is transfered to the receiving socket using
skb_set_owner_r(), which orphans the skb, thereby invoking the destructor
prematurely.

Since netlink doesn't account skbs to the originating socket, there's no
need to orphan the skb. Add a netlink specific skb_set_owner_r() variant
that does not orphan the skb and use a netlink specific destructor to
call sock_rfree().

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>