From cc05bf3ed22decdc82bcaf24ae6b9224634a8963 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Tue, 10 Mar 2026 00:55:34 -1000
Subject: [PATCH] [socket] Add LWIP_LOCK to socket factory functions

tcp_new() is an lwip core API call that must be bracketed with
the lwip lock on RP2040 per pico-sdk docs. Add LWIP_LOCK() to
socket() and socket_listen() factory functions.
---
 esphome/components/socket/lwip_raw_tcp_impl.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/esphome/components/socket/lwip_raw_tcp_impl.cpp b/esphome/components/socket/lwip_raw_tcp_impl.cpp
index cabf546a27..0c0d64d198 100644
--- a/esphome/components/socket/lwip_raw_tcp_impl.cpp
+++ b/esphome/components/socket/lwip_raw_tcp_impl.cpp
@@ -781,6 +781,7 @@ std::unique_ptr<Socket> socket(int domain, int type, int protocol) {
     errno = EPROTOTYPE;
     return nullptr;
   }
+  LWIP_LOCK();
   auto *pcb = tcp_new();
   if (pcb == nullptr)
     return nullptr;
@@ -800,6 +801,7 @@ std::unique_ptr<ListenSocket> socket_listen(int domain, int type, int protocol)
     errno = EPROTOTYPE;
     return nullptr;
   }
+  LWIP_LOCK();
   auto *pcb = tcp_new();
   if (pcb == nullptr)
     return nullptr;