From d2daf66d3839fda03333e579443e12c1f7b61f68 Mon Sep 17 00:00:00 2001
From: yangsong8 <yangsong8@xiaomi.com>
Date: Mon, 16 Jun 2025 14:43:20 +0800
Subject: [PATCH] drivers/usbdev/cdcacm: Fix the issue of missing release one
 req buf

When unbinding, if a req buf is held by priv->container, it also
needs to be released.

Signed-off-by: yangsong8 <yangsong8@xiaomi.com>
---
 drivers/usbdev/cdcacm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usbdev/cdcacm.c b/drivers/usbdev/cdcacm.c
index 851ebc1f254..554688f3c33 100644
--- a/drivers/usbdev/cdcacm.c
+++ b/drivers/usbdev/cdcacm.c
@@ -1500,6 +1500,12 @@ static void cdcacm_unbind(FAR struct usbdevclass_driver_s *driver,
 
 #ifdef CONFIG_CDCACM_DISABLE_TXBUF
       DEBUGASSERT(priv->nwrq >= CONFIG_CDCACM_NWRREQS - 1);
+      if (priv->wrcontainer)
+        {
+          sq_addlast((FAR sq_entry_t *)priv->wrcontainer, &priv->txfree);
+          priv->wrcontainer = NULL;
+          priv->nwrq++;
+        }
 #else
       DEBUGASSERT(priv->nwrq == CONFIG_CDCACM_NWRREQS);
 #endif