diff mbox series

[4.4,16/30] pktgen: fix misuse of BUG_ON() in pktgen_thread_worker()

Message ID 20210305120850.200812946@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman March 5, 2021, 12:22 p.m. UTC 
From: Di Zhu <zhudi21@huawei.com>

[ Upstream commit 275b1e88cabb34dbcbe99756b67e9939d34a99b6 ]

pktgen create threads for all online cpus and bond these threads to
relevant cpu repecivtily. when this thread firstly be woken up, it
will compare cpu currently running with the cpu specified at the time
of creation and if the two cpus are not equal, BUG_ON() will take effect
causing panic on the system.
Notice that these threads could be migrated to other cpus before start
running because of the cpu hotplug after these threads have created. so the
BUG_ON() used here seems unreasonable and we can replace it with WARN_ON()
to just printf a warning other than panic the system.

Signed-off-by: Di Zhu <zhudi21@huawei.com>
Link: https://lore.kernel.org/r/20210125124229.19334-1-zhudi21@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/core/pktgen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 4ea957c1e7ee..5d0759e2102e 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3519,7 +3519,7 @@  static int pktgen_thread_worker(void *arg)
 	struct pktgen_dev *pkt_dev = NULL;
 	int cpu = t->cpu;
 
-	BUG_ON(smp_processor_id() != cpu);
+	WARN_ON(smp_processor_id() != cpu);
 
 	init_waitqueue_head(&t->queue);
 	complete(&t->start_done);