Module Name: src
Committed By: riastradh
Date: Thu Aug 20 21:34:13 UTC 2020
Modified Files:
src/sys/net: if_wg.c
Log Message:
Fix race in wg_worker kthread destruction.
Also allow the thread to migrate between CPUs -- just not while we're
in the middle of processing and holding onto things with psrefs.
To generate a diff of this commit:
cvs rdiff -u -r1.9 -r1.10 src/sys/net/if_wg.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/net/if_wg.c
diff -u src/sys/net/if_wg.c:1.9 src/sys/net/if_wg.c:1.10
--- src/sys/net/if_wg.c:1.9 Thu Aug 20 21:34:03 2020
+++ src/sys/net/if_wg.c Thu Aug 20 21:34:13 2020
@@ -1,4 +1,4 @@
-/* $NetBSD: if_wg.c,v 1.9 2020/08/20 21:34:03 riastradh Exp $ */
+/* $NetBSD: if_wg.c,v 1.10 2020/08/20 21:34:13 riastradh Exp $ */
/*
* Copyright (C) Ryota Ozaki <[email protected]>
@@ -43,7 +43,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_wg.c,v 1.9 2020/08/20 21:34:03 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_wg.c,v 1.10 2020/08/20 21:34:13 riastradh Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
@@ -2736,32 +2736,32 @@ wg_worker(void *arg)
{
struct wg_softc *wg = arg;
struct wg_worker *wgw = wg->wg_worker;
- int bound = curlwp_bind();
+ bool todie = false;
KASSERT(wg != NULL);
KASSERT(wgw != NULL);
- while (!wgw->wgw_todie) {
+ while (!todie) {
int reasons;
+ int bound;
mutex_enter(&wgw->wgw_lock);
/* New tasks may come during task handling */
- if (wgw->wgw_wakeup_reasons == 0)
+ while ((reasons = wgw->wgw_wakeup_reasons) == 0 &&
+ !(todie = wgw->wgw_todie))
cv_wait(&wgw->wgw_cv, &wgw->wgw_lock);
- reasons = wgw->wgw_wakeup_reasons;
wgw->wgw_wakeup_reasons = 0;
mutex_exit(&wgw->wgw_lock);
+ bound = curlwp_bind();
if (ISSET(reasons, WG_WAKEUP_REASON_RECEIVE_PACKETS_IPV4))
wg_receive_packets(wg, AF_INET);
if (ISSET(reasons, WG_WAKEUP_REASON_RECEIVE_PACKETS_IPV6))
wg_receive_packets(wg, AF_INET6);
- if (!ISSET(reasons, WG_WAKEUP_REASON_PEER))
- continue;
-
- wg_process_peer_tasks(wg);
+ if (ISSET(reasons, WG_WAKEUP_REASON_PEER))
+ wg_process_peer_tasks(wg);
+ curlwp_bindx(bound);
}
- curlwp_bindx(bound);
kthread_exit(0);
}
