From: Akinobu Mita <akinobu.mita@gmail.com>
Date: Thu, 13 Jan 2011 00:59:28 +0000 (-0800)
Subject: uml: use simple_write_to_buffer()
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=0388fae4115dcfc310ac7327a8ac72786987c26e;p=openwrt%2Fstaging%2Fblogic.git

uml: use simple_write_to_buffer()

Simplify write file operation for mmapper by using
simple_write_to_buffer().

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/um/drivers/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c
index 6bc73f0e8e29..7e0619c2c2c6 100644
--- a/arch/um/drivers/mmapper_kern.c
+++ b/arch/um/drivers/mmapper_kern.c
@@ -37,13 +37,7 @@ static ssize_t mmapper_write(struct file *file, const char __user *buf,
 	if (*ppos > mmapper_size)
 		return -EINVAL;
 
-	if (count > mmapper_size - *ppos)
-		count = mmapper_size - *ppos;
-
-	if (copy_from_user(&v_buf[*ppos], buf, count))
-		return -EFAULT;
-
-	return count;
+	return simple_write_to_buffer(v_buf, mmapper_size, ppos, buf, count);
 }
 
 static long mmapper_ioctl(struct file *file, unsigned int cmd, unsigned long arg)