[PATCH net] netdevsim: disable local BH when scheduling NAPI

[Breno Leitao]

The netdevsim driver was getting NOHZ tick-stop errors during packet
transmission due to pending softirq work when calling napi_schedule().

This is showing the following message when running netconsole selftest.

	NOHZ tick-stop error: local softirq work is pending, handler #08!!!

Add local_bh_disable()/enable() around the napi_schedule() call to
prevent softirqs from being handled during this xmit.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 3762ec05a9fb ("netdevsim: add NAPI support")
Suggested-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
---
 drivers/net/netdevsim/netdev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 42f247cbdceecbadf27f7090c030aa5bd240c18a..6aeb081b06da226ab91c49f53d08f465570877ae 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -87,7 +87,9 @@ static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (unlikely(nsim_forward_skb(peer_dev, skb, rq) == NET_RX_DROP))
 		goto out_drop_cnt;
 
+	local_bh_disable();
 	napi_schedule(&rq->napi);
+	local_bh_enable();
 
 	rcu_read_unlock();
 	u64_stats_update_begin(&ns->syncp);

---
base-commit: cf33d96f50903214226b379b3f10d1f262dae018
change-id: 20250212-netdevsim-258d2d628175

Best regards,
-- 
Breno Leitao <leitao@xxxxxxxxxx>