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The tw_pcbrele() function does not need the global timewait lock.

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Submitted by:	Julien Charbon
Suggested by:	glebius
This commit is contained in:
John Baldwin 2014-04-11 19:17:45 +00:00
parent f567f56ebf
commit 2ffb755cec
1 changed files with 5 additions and 15 deletions
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20
sys/netinet/tcp_timewait.c
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@ -133,23 +133,18 @@ tw_pcbref(struct tcptw *tw)
}
/*
* Drop a refcount on an tw elevated using tw_pcbref(). Return
* the tw lock released.
* Drop a refcount on an tw elevated using tw_pcbref().
*/
static int
tw_pcbrele(struct tcptw *tw)
{
TW_WLOCK_ASSERT(V_tw_lock);
KASSERT(tw->tw_refcount > 0, ("%s: refcount 0", __func__));
if (!refcount_release(&tw->tw_refcount)) {
TW_WUNLOCK(V_tw_lock);
if (!refcount_release(&tw->tw_refcount))
return (0);
}
uma_zfree(V_tcptw_zone, tw);
TW_WUNLOCK(V_tw_lock);
return (1);
}
@ -682,13 +677,10 @@ tcp_tw_2msl_stop(struct tcptw *tw, int reuse)
TAILQ_REMOVE(&V_twq_2msl, tw, tw_2msl);
crfree(tw->tw_cred);
tw->tw_cred = NULL;
if (!reuse) {
tw_pcbrele(tw);
return;
}
TW_WUNLOCK(V_tw_lock);
if (!reuse)
tw_pcbrele(tw);
}
struct tcptw *
@ -730,7 +722,6 @@ tcp_tw_2msl_scan(void)
/* Close timewait state */
if (INP_INFO_TRY_WLOCK(&V_tcbinfo)) {
TW_WLOCK(V_tw_lock);
if (tw_pcbrele(tw)) {
INP_INFO_WUNLOCK(&V_tcbinfo);
continue;
@ -744,7 +735,6 @@ tcp_tw_2msl_scan(void)
INP_INFO_WUNLOCK(&V_tcbinfo);
} else {
/* INP_INFO lock is busy, continue later */
TW_WLOCK(V_tw_lock);
tw_pcbrele(tw);
break;
}