When the network port is down, the queue is released, and ring->len is 0.
In debugfs, hbg_get_queue_used_num() will be called,
which may lead to a division by zero issue.
This patch adds a check, if ring->len is 0,
hbg_get_queue_used_num() directly returns 0.
Fixes: 40735e7543f9 ("net: hibmcge: Implement .ndo_start_xmit function")
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
---
ChangeLog:
v2 -> v3:
- Use READ_ONCE() to read temporary variable, suggested by Jakub Kicinski
v2: https://lore.kernel.org/all/20250805181446.3deaceb9@kernel.org/
---
drivers/net/ethernet/hisilicon/hibmcge/hbg_txrx.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/hisilicon/hibmcge/hbg_txrx.h b/drivers/net/ethernet/hisilicon/hibmcge/hbg_txrx.h
index 2883a5899ae2..8b6110599e10 100644
--- a/drivers/net/ethernet/hisilicon/hibmcge/hbg_txrx.h
+++ b/drivers/net/ethernet/hisilicon/hibmcge/hbg_txrx.h
@@ -29,7 +29,12 @@ static inline bool hbg_fifo_is_full(struct hbg_priv *priv, enum hbg_dir dir)
static inline u32 hbg_get_queue_used_num(struct hbg_ring *ring)
{
- return (ring->ntu + ring->len - ring->ntc) % ring->len;
+ u32 len = READ_ONCE(ring->len);
+
+ if (!len)
+ return 0;
+
+ return (READ_ONCE(ring->ntu) + len - READ_ONCE(ring->ntc)) % len;
}
netdev_tx_t hbg_net_start_xmit(struct sk_buff *skb, struct net_device *netdev);
--
2.33.0