From 9e374e7b729dc9f68be89cd3e3b1d4d48c768ecf Mon Sep 17 00:00:00 2001
From: Tom Rini <trini@ti.com>
Date: Mon, 24 Nov 2014 11:50:46 -0500
Subject: fs/ext4/ext4fs.c, fs/fs.c fs/fat/fat_write.c: Adjust 64bit math
 methods

The changes to introduce loff_t into filesize means that we need to do
64bit math on 32bit platforms.  Make sure we use the right wrappers for
these operations.

Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Suriyan Ramasami <suriyan.r@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@ti.com>
Tested-by: Pierre Aubert <p.aubert@staubli.com>
---
 fs/fat/fat_write.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

(limited to 'fs/fat')

diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
index 88dd4959cc..98b88add83 100644
--- a/fs/fat/fat_write.c
+++ b/fs/fat/fat_write.c
@@ -13,6 +13,8 @@
 #include <asm/byteorder.h>
 #include <part.h>
 #include <linux/ctype.h>
+#include <div64.h>
+#include <linux/math64.h>
 #include "fat.c"
 
 static void uppercase(char *str, int len)
@@ -770,7 +772,7 @@ static void fill_dentry(fsdata *mydata, dir_entry *dentptr,
  */
 static int check_overflow(fsdata *mydata, __u32 clustnum, loff_t size)
 {
-	__u32 startsect, sect_num;
+	__u32 startsect, sect_num, offset;
 
 	if (clustnum > 0) {
 		startsect = mydata->data_begin +
@@ -779,13 +781,13 @@ static int check_overflow(fsdata *mydata, __u32 clustnum, loff_t size)
 		startsect = mydata->rootdir_sect;
 	}
 
-	sect_num = size / mydata->sect_size;
-	if (size % mydata->sect_size)
+	sect_num = div_u64_rem(size, mydata->sect_size, &offset);
+
+	if (offset != 0)
 		sect_num++;
 
 	if (startsect + sect_num > cur_part_info.start + total_sector)
 		return -1;
-
 	return 0;
 }
 
-- 
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