From c8a93f31e99a183426a65eda3cf4ba754545786b Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Mon, 9 Feb 2026 09:28:15 -0600
Subject: [PATCH] Add comment explaining early guard

---
 esphome/components/dfplayer/dfplayer.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/esphome/components/dfplayer/dfplayer.cpp b/esphome/components/dfplayer/dfplayer.cpp
index 6ef9be3865..91aa608d01 100644
--- a/esphome/components/dfplayer/dfplayer.cpp
+++ b/esphome/components/dfplayer/dfplayer.cpp
@@ -132,9 +132,8 @@ void DFPlayer::send_cmd_(uint8_t cmd, uint16_t argument) {
 }
 
 void DFPlayer::loop() {
-  // Read message
-  // All current UART available() implementations return >= 0,
-  // use <= 0 to future-proof against any that may return negative on error.
+  // Early return avoids stack adjustment for the batch buffer below.
+  // loop() runs ~7000/min so most calls have nothing to read.
   int avail = this->available();
   if (avail <= 0)
     return;