From: Vincent Whitchurch <[email protected]>
Date: Thu, 6 Sep 2018 15:54:59 +0200
> According to the documentation in msg_zerocopy.rst, the SO_ZEROCOPY
> flag was introduced because send(2) ignores unknown message flags and
> any legacy application which was accidentally passing the equivalent of
> MSG_ZEROCOPY earlier should not see any new behaviour.
>
> Before commit f214f915e7db ("tcp: enable MSG_ZEROCOPY"), a send(2) call
> which passed the equivalent of MSG_ZEROCOPY without setting SO_ZEROCOPY
> would succeed. However, after that commit, it fails with -ENOBUFS. So
> it appears that the SO_ZEROCOPY flag fails to fulfill its intended
> purpose. Fix it.
>
> Fixes: f214f915e7db ("tcp: enable MSG_ZEROCOPY")
> Signed-off-by: Vincent Whitchurch <[email protected]>
Applied and queued up for -stable, thanks.
