From 4fa0619d039f561dd2207055cf21a10abaeebe0e Mon Sep 17 00:00:00 2001 From: Runyu Xiao Date: Wed, 1 Jul 2026 20:40:17 +0800 Subject: [PATCH] net: rmnet: annotate endpoint lookup under RTNL rmnet_get_endpoint() is shared by packet receive paths and RTNL-protected control paths. The receive paths already run under RCU/BH context through the RX handler, while the control paths reach rmnet_get_endpoint() after obtaining the rmnet port with rmnet_get_port_rtnl(). The helper walks port->muxed_ep[] with hlist_for_each_entry_rcu(). Pass lockdep_rtnl_is_held() as the non-RCU protection condition so CONFIG_PROVE_RCU_LIST can see the RTNL-protected control-path calls while preserving the existing RCU-reader behavior for data paths. This was found by our static analysis tool and then manually reviewed against the current tree. The dynamic triage evidence is a target-matched CONFIG_PROVE_RCU_LIST warning; the change is limited to documenting the existing protection contract. This is a lockdep annotation cleanup. It does not change endpoint lifetime or hash updates. Signed-off-by: Runyu Xiao Reviewed-by: Subash Abhinov Kasiviswanathan Link: https://patch.msgid.link/20260701124017.3205729-1-runyu.xiao@seu.edu.cn Signed-off-by: Paolo Abeni --- drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c index 78d4df55740a..bed6f63facf2 100644 --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c @@ -423,7 +423,8 @@ struct rmnet_endpoint *rmnet_get_endpoint(struct rmnet_port *port, u8 mux_id) { struct rmnet_endpoint *ep; - hlist_for_each_entry_rcu(ep, &port->muxed_ep[mux_id], hlnode) { + hlist_for_each_entry_rcu(ep, &port->muxed_ep[mux_id], hlnode, + lockdep_rtnl_is_held()) { if (ep->mux_id == mux_id) return ep; }