Author: jhb
Date: Wed Aug 14 23:05:57 2019
New Revision: 351057
URL: https://svnweb.freebsd.org/changeset/base/351057
Log:
MFC 346360: Push down INP_WLOCK slightly in tcp_ctloutput.
The inp lock is not needed for testing the V6 flag as that flag is set
once when the inp is created and never changes. For non-TCP socket
options the lock is immediately dropped after checking that flag.
This just pushes the lock down to only be acquired for TCP socket
options.
This isn't a hot-path, more a cosmetic cleanup I noticed while reading
the code.
Modified:
stable/12/sys/netinet/tcp_usrreq.c
Directory Properties:
stable/12/ (props changed)
Changes in other areas also in this revision:
Modified:
stable/11/sys/netinet/tcp_usrreq.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/12/sys/netinet/tcp_usrreq.c
==============================================================================
--- stable/12/sys/netinet/tcp_usrreq.c Wed Aug 14 22:35:11 2019
(r351056)
+++ stable/12/sys/netinet/tcp_usrreq.c Wed Aug 14 23:05:57 2019
(r351057)
@@ -1578,11 +1578,9 @@ tcp_ctloutput(struct socket *so, struct sockopt *sopt)
error = 0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
- INP_WLOCK(inp);
if (sopt->sopt_level != IPPROTO_TCP) {
#ifdef INET6
if (inp->inp_vflag & INP_IPV6PROTO) {
- INP_WUNLOCK(inp);
error = ip6_ctloutput(so, sopt);
/*
* In case of the IPV6_USE_MIN_MTU socket option,
@@ -1627,12 +1625,12 @@ tcp_ctloutput(struct socket *so, struct sockopt *sopt)
#endif
#ifdef INET
{
- INP_WUNLOCK(inp);
error = ip_ctloutput(so, sopt);
}
#endif
return (error);
}
+ INP_WLOCK(inp);
if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
INP_WUNLOCK(inp);
return (ECONNRESET);
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