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pktgen: use cpus_read_lock() in pg_net_init()

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I have seen the WARN_ON(smp_processor_id() != cpu) firing
in pktgen_thread_worker() during tests.

We must use cpus_read_lock()/cpus_read_unlock()
around the for_each_online_cpu(cpu) loop.

While we are at it use WARN_ON_ONCE() to avoid a possible syslog flood.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240821175339.1191779-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2024-08-21 17:53:39 +00:00 committed by Jakub Kicinski
parent aa0743a229
commit 979b581e4c
1 changed files with 3 additions and 1 deletions
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4
net/core/pktgen.c
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@ -3654,7 +3654,7 @@ static int pktgen_thread_worker(void *arg)
struct pktgen_dev *pkt_dev = NULL;
int cpu = t->cpu;
WARN_ON(smp_processor_id() != cpu);
WARN_ON_ONCE(smp_processor_id() != cpu);
init_waitqueue_head(&t->queue);
complete(&t->start_done);
@ -3989,6 +3989,7 @@ static int __net_init pg_net_init(struct net *net)
goto remove;
}
cpus_read_lock();
for_each_online_cpu(cpu) {
int err;
@ -3997,6 +3998,7 @@ static int __net_init pg_net_init(struct net *net)
pr_warn("Cannot create thread for cpu %d (%d)\n",
cpu, err);
}
cpus_read_unlock();
if (list_empty(&pn->pktgen_threads)) {
pr_err("Initialization failed for all threads\n");