From ec204563b1fa9d691c22be93d8a6ed26673e379c Mon Sep 17 00:00:00 2001
From: Christopher Williams <abbrev@gmail.com>
Date: Thu, 4 Feb 2021 17:02:02 -0700
Subject: [PATCH] R0.14a patch 1

February 3, 2021

File gets dead-locked when f_open funciton failed with some conditions.

This is because the file is left locked when it is opened with FA_OPEN_APPEND flag and failed the
function due to a seek error.
---
 source/ff.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/source/ff.c b/source/ff.c
index a378cf1..fca4371 100644
--- a/source/ff.c
+++ b/source/ff.c
@@ -3882,6 +3882,9 @@ FRESULT f_open (
 #endif
 					}
 				}
+#if FF_FS_LOCK != 0
+				if (res != FR_OK) dec_lock(fp->obj.lockid); /* Decrement file open counter if seek failed */
+#endif
 			}
 #endif
 		}