From: Eric Dumazet <eric.duma...@gmail.com>
Date: Tue, 23 Aug 2016 13:59:33 -0700
> From: Eric Dumazet <eduma...@google.com>
>
> Laura tracked poll() [and friends] regression caused by commit
> e6afc8ace6dd ("udp: remove headers from UDP packets before queueing")
>
> udp_poll() needs to know if there is a valid packet in receive queue,
> even if its payload length is 0.
>
> Change first_packet_length() to return an signed int, and use -1
> as the indication of an empty queue.
>
> Fixes: e6afc8ace6dd ("udp: remove headers from UDP packets before queueing")
> Reported-by: Laura Abbott <labb...@redhat.com>
> Signed-off-by: Eric Dumazet <eduma...@google.com>
> Tested-by: Laura Abbott <labb...@redhat.com>
> ---
> v2: fix the comment/doc (Willem)
Applied and queued up for -stable, thanks.
