From 76a9624d2ebdeabb8829c91ed2732447bbd092e9 Mon Sep 17 00:00:00 2001
From: Dave Murphy <wntrmute@users.sourceforge.net>
Date: Tue, 9 Jun 2009 18:20:22 +0000
Subject: [PATCH] only sync if file open for writing

---
 source/fatfile.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/source/fatfile.c b/source/fatfile.c
index 60b6267..36152f3 100644
--- a/source/fatfile.c
+++ b/source/fatfile.c
@@ -316,10 +316,12 @@ int _FAT_close_r (struct _reent *r, int fd) {
 
 	_FAT_lock(&file->partition->lock);
 
-	ret = _FAT_syncToDisc (file);
-	if (ret != 0) {
-		r->_errno = ret;
-		ret = -1;
+	if (file->write) {
+		ret = _FAT_syncToDisc (file);
+		if (ret != 0) {
+			r->_errno = ret;
+			ret = -1;
+		}
 	}
 
 	file->inUse = false;