Regression since e0b46d0ee9c240c7430a47e9b0365674d4a04522

Hi,

Juniper VPN client is not working since upgrade to linux-3.19,

I did a bisect between v3.18 and v3.19 and it shows that culprit is:

Author: Herbert Xu [off-list ref]
Date:   Fri Nov 7 21:22:23 2014 +0800

   tun: Use iovec iterators


I wasn't able to revert this patch, since result doesn't compile due
to lack of skb_copy_datagram_const_iovec()

I can't analyze what happens on Juniper VPN client, since I have no
access to its source code (it's provided in binary form only).

Regards,
Vasily