From 45d5d9b3600faa0cb10caef3e2b8a9e8a9479f02 Mon Sep 17 00:00:00 2001
From: me-no-dev <hristo@espressif.com>
Date: Mon, 6 Nov 2017 16:13:09 +0200
Subject: [PATCH] Fix SD issue on failed mount

fixes: https://github.com/espressif/arduino-esp32/issues/613
---
 libraries/SD/src/SD.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libraries/SD/src/SD.cpp b/libraries/SD/src/SD.cpp
index be307f39..f92532ca 100644
--- a/libraries/SD/src/SD.cpp
+++ b/libraries/SD/src/SD.cpp
@@ -36,6 +36,7 @@ bool SDFS::begin(uint8_t ssPin, SPIClass &spi, uint32_t frequency, const char *
     }
 
     if(!sdcard_mount(_pdrv, mountpoint)){
+        sdcard_unmount(_pdrv);
         sdcard_uninit(_pdrv);
         _pdrv = 0xFF;
         return false;