packages/utils/lcd4linux/patches/900-plugin_layout-prevent-concurrent-layout-switches.patch

From a63bc75301a3c4a74eb2723e34606ac40e473d27 Mon Sep 17 00:00:00 2001
From: Oliver Sedlbauer <os@dev.tdt.de>
Date: Fri, 6 Mar 2026 10:59:44 +0100
Subject: [PATCH] plugin_layout: prevent concurrent layout switches

In plugin_layout, switching layouts while a switch is already in progress
corrupts widget timer state and causes a segfault. Use a static lock to
skip layout switches that arrive while one is already in progress.

Signed-off-by: Oliver Sedlbauer <os@dev.tdt.de>
---
 plugin_layout.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

--- a/plugin_layout.c
+++ b/plugin_layout.c
@@ -251,15 +251,25 @@ static int my_hide_layout(const Layout *
 
 static int my_switch_layout(const int groupIdx, const int layoutIdx)
 {
+	static int switching = 0;
+	if (switching) {
+		my_info("Skipping layout switch, already in progress");
+		return 0;
+	}
+	switching = 1;
 
-    if (groupIdx < 0 || groupIdx >= plugin->groupNb)
-	return -1;
+	if (groupIdx < 0 || groupIdx >= plugin->groupNb) {
+		switching = 0;
+		return -1;
+	}
 
     LayoutGroup *oldGroup = plugin->currentGroup;
     LayoutGroup *newGroup = plugin->groups[groupIdx];
 
-    if (layoutIdx < 0 || layoutIdx >= newGroup->layoutNb)
-	return -1;
+	if (layoutIdx < 0 || layoutIdx >= newGroup->layoutNb) {
+		switching = 0;
+		return -1;
+	}
 
     Layout *oldLayout = plugin->currentLayout;
     Layout *newLayout = newGroup->layouts[layoutIdx];
@@ -292,7 +302,7 @@ static int my_switch_layout(const int gr
 
 	action_trigger(newLayout->firstAction, "onenter");
     }
-
+	switching = 0;
     return status;
 }