From: Sonic Zhang <sonic.zhang@analog.com>
Date: Thu, 31 Jan 2013 08:34:53 +0000 (+0800)
Subject: blackfin: sync data in blackfin write buffer
X-Git-Tag: v3.9-rc1~101^2~2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=293be8de49a05ca510069e7ab2d5057c728dd155;p=thirdparty%2Fkernel%2Flinux.git

blackfin: sync data in blackfin write buffer

Sync data in blackfin write buffer to DRAM before return from
copy_to_user.
Otherwise, application may read wrong data from stat syscall occasionally.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
---

diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h
index 461bb542e2e8e..57701c3b8a591 100644
--- a/arch/blackfin/include/asm/uaccess.h
+++ b/arch/blackfin/include/asm/uaccess.h
@@ -191,6 +191,7 @@ copy_to_user(void __user *to, const void *from, unsigned long n)
 		memcpy((void __force *)to, from, n);
 	else
 		return n;
+	SSYNC();
 	return 0;
 }