git: 2d99af941040 - main - tcp: remove check for condition that never happens

The branch main has been updated by glebius:

URL: https://cgit.FreeBSD.org/src/commit/?id=2d99af941040548234c7945cc6d62c416bd9133c

commit 2d99af941040548234c7945cc6d62c416bd9133c
Author:     Gleb Smirnoff <glebius@FreeBSD.org>
AuthorDate: 2025-01-31 22:24:24 +0000
Commit:     Gleb Smirnoff <glebius@FreeBSD.org>
CommitDate: 2025-01-31 22:24:24 +0000

    tcp: remove check for condition that never happens
    
    A tcpcb in TCPS_LISTEN has always socket in SO_ACCEPTCONN.  One block
    above there is an assertion that proves that this never happens.  We
    stopped ever clearing SO_ACCEPTCONN back in 779f106aa169.
    
    This reverts commit 982c1675ff8864f51007e0be402ead88429222bb.
    
    Reviewed by:            cc, markj
    Differential Revision:  https://reviews.freebsd.org/D48710
---
 sys/netinet/tcp_input.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
index 03d493b1d7a9..647bcd17f7bc 100644
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -1354,15 +1354,6 @@ tfo_socket_result:
 		 * Only the listen socket is unlocked by syncache_add().
 		 */
 		return (IPPROTO_DONE);
-	} else if (tp->t_state == TCPS_LISTEN) {
-		/*
-		 * When a listen socket is torn down the SO_ACCEPTCONN
-		 * flag is removed first while connections are drained
-		 * from the accept queue in a unlock/lock cycle of the
-		 * ACCEPT_LOCK, opening a race condition allowing a SYN
-		 * attempt go through unhandled.
-		 */
-		goto dropunlock;
 	}
 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
 	if (tp->t_flags & TF_SIGNATURE) {