uml: use simple_write_to_buffer()

Simplify write file operation for mmapper by using simple_write_to_buffer(). Signed-off-by: Akinobu Mita <[email protected]> Cc: Jeff Dike <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
RyanHsu · Jan 13, 2011 · 0388fae · 0388fae
1 parent 07ecb79
commit 0388fae
Showing 1 changed file with 1 addition and 7 deletions.
diff --git 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)