[PATCH v3 01/20] tcp: Always pass NULL event with EPOLL_CTL_DEL

[Stefano Brivio <sbrivio@redhat.com>]

From: David Gibson <david@gibson.dropbear.id.au>

In tcp_epoll_ctl() we pass an event pointer with EPOLL_CTL_DEL, even though
it will be ignored.  It's possible this was a workaround for pre-2.6.9
kernels which required a non-NULL pointer here, but we rely on the kernel
accepting NULL events for EPOLL_CTL_DEL in lots of other places.  Use
NULL instead for simplicity and consistency.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 tcp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tcp.c b/tcp.c
index c89f323..4eed82b 100644
--- a/tcp.c
+++ b/tcp.c
@@ -468,9 +468,9 @@ static int tcp_epoll_ctl(const struct ctx *c, struct tcp_tap_conn *conn)
 
 	if (conn->events == CLOSED) {
 		if (conn->in_epoll)
-			epoll_ctl(c->epollfd, EPOLL_CTL_DEL, conn->sock, &ev);
+			epoll_ctl(c->epollfd, EPOLL_CTL_DEL, conn->sock, NULL);
 		if (conn->timer != -1)
-			epoll_ctl(c->epollfd, EPOLL_CTL_DEL, conn->timer, &ev);
+			epoll_ctl(c->epollfd, EPOLL_CTL_DEL, conn->timer, NULL);
 		return 0;
 	}
 
-- 
@@ -468,9 +468,9 @@ static int tcp_epoll_ctl(const struct ctx *c, struct tcp_tap_conn *conn)
 
 	if (conn->events == CLOSED) {
 		if (conn->in_epoll)
-			epoll_ctl(c->epollfd, EPOLL_CTL_DEL, conn->sock, &ev);
+			epoll_ctl(c->epollfd, EPOLL_CTL_DEL, conn->sock, NULL);
 		if (conn->timer != -1)
-			epoll_ctl(c->epollfd, EPOLL_CTL_DEL, conn->timer, &ev);
+			epoll_ctl(c->epollfd, EPOLL_CTL_DEL, conn->timer, NULL);
 		return 0;
 	}
 
-- 
2.43.0