From: Andrew Morton <akpm@osdl.org>
Date: Sat, 20 May 2006 09:17:21 +0000 (+0100)
Subject: [MTD] Avoid 64-bit division in mtdconcat
X-Git-Tag: firefly_0821_release~35482^2~78
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6c8b44abc86a3e23dd1a22c0ee187f06bd7c7f5d;p=firefly-linux-kernel-4.4.55.git

[MTD] Avoid 64-bit division in mtdconcat

WARNING: "__moddi3" [drivers/mtd/mtdconcat.ko] undefined!

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
---

diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index b7de90845c2d..3c61a980c56c 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -19,6 +19,8 @@
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/concat.h>
 
+#include <asm/div64.h>
+
 /*
  * Our storage structure:
  * Subdev points to an array of pointers to struct mtd_info objects
@@ -276,9 +278,11 @@ concat_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs,
 		return -EINVAL;
 
 	/* Check alignment */
-	if (mtd->oobblock > 1)
-		if ((to % mtd->oobblock) || (total_len % mtd->oobblock))
+	if (mtd->oobblock > 1) {
+		loff_t __to = to;
+		if (do_div(__to, mtd->oobblock) || (total_len % mtd->oobblock))
 			return -EINVAL;
+	}
 
 	/* make a copy of vecs */
 	vecs_copy = kmalloc(sizeof(struct kvec) * count, GFP_KERNEL);