tcp_splice: Don't handle EPOLL_CTL_DEL as part of tcp_splice_epoll_ctl()

tcp_splice_epoll_ctl() removes both sockets from the epoll set if called
when conn->flags & CLOSING.  This will always happen immediately after
setting that flag, since conn_flag_do() makes the call itself.  That's also
the _only_ time it can happen: we perform the EPOLL_CTL_DEL without
clearing the conn->in_epoll flag, meaning that any further calls to
tcp_splice_epoll_ctl() would attempt EPOLL_CTL_MOD, which would necessarily
fail since the fds are no longer in the epoll.

The EPOLL_CTL_DEL path in tcp_splice_epoll_ctl() has essentially zero
overlap with anything else the function does, so just move them to be
open coded in conn_flag_do().

This does require kernel 2.6.9 or later, in order to pass NULL as the
event structure for epoll_ctl().  However, we already require at least
3.13 to allow unprivileged user namespaces.

Given that, simply directly perform the EPOLL_CTL_DEL operations from
conn_flag_do() rather than unnecessarily multiplexini

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

0 files changed, 0 insertions, 0 deletions