From 8884c693991333ae065830554b9b0c96590b1bb2 Mon Sep 17 00:00:00 2001 From: Hangbin Liu Date: Fri, 5 Sep 2025 09:15:31 +0000 Subject: hsr: use rtnl lock when iterating over ports hsr_for_each_port is called in many places without holding the RCU read lock, this may trigger warnings on debug kernels. Most of the callers are actually hold rtnl lock. So add a new helper hsr_for_each_port_rtnl to allow callers in suitable contexts to iterate ports safely without explicit RCU locking. This patch only fixed the callers that is hold rtnl lock. Other caller issues will be fixed in later patches. Fixes: c5a759117210 ("net/hsr: Use list_head (and rcu) instead of array for slave devices.") Signed-off-by: Hangbin Liu Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250905091533.377443-2-liuhangbin@gmail.com Signed-off-by: Paolo Abeni --- net/hsr/hsr_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/hsr/hsr_main.c') diff --git a/net/hsr/hsr_main.c b/net/hsr/hsr_main.c index 192893c3f2ec..ac1eb1db1a52 100644 --- a/net/hsr/hsr_main.c +++ b/net/hsr/hsr_main.c @@ -22,7 +22,7 @@ static bool hsr_slave_empty(struct hsr_priv *hsr) { struct hsr_port *port; - hsr_for_each_port(hsr, port) + hsr_for_each_port_rtnl(hsr, port) if (port->type != HSR_PT_MASTER) return false; return true; -- cgit v1.2.3 From 393c841fe4333cdd856d0ca37b066d72746cfaa6 Mon Sep 17 00:00:00 2001 From: Hangbin Liu Date: Fri, 5 Sep 2025 09:15:32 +0000 Subject: hsr: use hsr_for_each_port_rtnl in hsr_port_get_hsr hsr_port_get_hsr() iterates over ports using hsr_for_each_port(), but many of its callers do not hold the required RCU lock. Switch to hsr_for_each_port_rtnl(), since most callers already hold the rtnl lock. After review, all callers are covered by either the rtnl lock or the RCU lock, except hsr_dev_xmit(). Fix this by adding an RCU read lock there. Fixes: c5a759117210 ("net/hsr: Use list_head (and rcu) instead of array for slave devices.") Signed-off-by: Hangbin Liu Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250905091533.377443-3-liuhangbin@gmail.com Signed-off-by: Paolo Abeni --- net/hsr/hsr_device.c | 3 +++ net/hsr/hsr_main.c | 2 +- 2 files changed, 4 insertions(+), 1 deletion(-) (limited to 'net/hsr/hsr_main.c') diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c index bce7b4061ce0..702da1f9aaa9 100644 --- a/net/hsr/hsr_device.c +++ b/net/hsr/hsr_device.c @@ -226,6 +226,7 @@ static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) struct hsr_priv *hsr = netdev_priv(dev); struct hsr_port *master; + rcu_read_lock(); master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); if (master) { skb->dev = master->dev; @@ -238,6 +239,8 @@ static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) dev_core_stats_tx_dropped_inc(dev); dev_kfree_skb_any(skb); } + rcu_read_unlock(); + return NETDEV_TX_OK; } diff --git a/net/hsr/hsr_main.c b/net/hsr/hsr_main.c index ac1eb1db1a52..bc94b07101d8 100644 --- a/net/hsr/hsr_main.c +++ b/net/hsr/hsr_main.c @@ -134,7 +134,7 @@ struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt) { struct hsr_port *port; - hsr_for_each_port(hsr, port) + hsr_for_each_port_rtnl(hsr, port) if (port->type == pt) return port; return NULL; -- cgit v1.2.3