diff --git a/channels/chan_dahdi.c b/channels/chan_dahdi.c
index 49f9d3e711..d14a3bd03e 100644
--- a/channels/chan_dahdi.c
+++ b/channels/chan_dahdi.c
@@ -4637,10 +4637,11 @@ static struct ast_frame  *dahdi_read(struct ast_channel *ast)
 	int index;
 	void *readbuf;
 	struct ast_frame *f;
-	
 
-	ast_mutex_lock(&p->lock);
-	
+	while (ast_mutex_trylock(&p->lock)) {
+		DEADLOCK_AVOIDANCE(&ast->lock);
+	}
+
 	index = dahdi_get_index(ast, p, 0);
 	
 	/* Hang up if we don't really exist */