use irq-safe version of llist operations between USB callback and main
diff --git a/firmware/src_simtrace/llist_irqsafe.h b/firmware/src_simtrace/llist_irqsafe.h
new file mode 100644
index 0000000..b466939
--- /dev/null
+++ b/firmware/src_simtrace/llist_irqsafe.h
@@ -0,0 +1,27 @@
+#pragma once
+
+#include "linuxlist.h"
+
+static inline void llist_add_tail_irqsafe(struct llist_head *_new,
+ struct llist_head *head)
+{
+ __disable_irq();
+ llist_add_tail(_new, head);
+ __enable_irq();
+}
+
+static inline struct llist_head *llist_head_dequeue_irqsafe(struct llist_head *head)
+{
+ struct llist_head *lh;
+
+ __disable_irq();
+ if (llist_empty(head)) {
+ lh = NULL;
+ } else {
+ lh = head->next;
+ llist_del(lh);
+ }
+ __enable_irq();
+
+ return lh;
+}