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-rw-r--r--net/core/pktgen.c20
1 files changed, 12 insertions, 8 deletions
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 319ad5490fb3..f975c5e2a369 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Authors:
* Copyright 2001, 2002 by Robert Olsson <robert.olsson@its.uu.se>
@@ -8,12 +9,6 @@
* Ben Greear <greearb@candelatech.com>
* Jens Låås <jens.laas@data.slu.se>
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- *
* A tool for loading the network with preconfigurated packets.
* The tool is implemented as a linux module. Parameters are output
* device, delay (to hard_xmit), number of packets, and whether
@@ -60,7 +55,6 @@
*
* Integrated to 2.5.x 021029 --Lucio Maciel (luciomaciel@zipmail.com.br)
*
- *
* 021124 Finished major redesign and rewrite for new functionality.
* See Documentation/networking/pktgen.txt for how to use this.
*
@@ -114,7 +108,6 @@
*
* Fixed src_mac command to set source mac of packet to value specified in
* command by Adit Ranadive <adit.262@gmail.com>
- *
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -3066,7 +3059,13 @@ static int pktgen_wait_thread_run(struct pktgen_thread *t)
{
while (thread_is_running(t)) {
+ /* note: 't' will still be around even after the unlock/lock
+ * cycle because pktgen_thread threads are only cleared at
+ * net exit
+ */
+ mutex_unlock(&pktgen_thread_lock);
msleep_interruptible(100);
+ mutex_lock(&pktgen_thread_lock);
if (signal_pending(current))
goto signal;
@@ -3081,6 +3080,10 @@ static int pktgen_wait_all_threads_run(struct pktgen_net *pn)
struct pktgen_thread *t;
int sig = 1;
+ /* prevent from racing with rmmod */
+ if (!try_module_get(THIS_MODULE))
+ return sig;
+
mutex_lock(&pktgen_thread_lock);
list_for_each_entry(t, &pn->pktgen_threads, th_list) {
@@ -3094,6 +3097,7 @@ static int pktgen_wait_all_threads_run(struct pktgen_net *pn)
t->control |= (T_STOP);
mutex_unlock(&pktgen_thread_lock);
+ module_put(THIS_MODULE);
return sig;
}