From: Akinobu Mita <akinobu.mita@gmail.com>

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Doug Warzecha <Douglas_Warzecha@dell.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Matt Domsch <Matt_Domsch@dell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/firmware/dcdbas.c |   14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff -puN drivers/firmware/dcdbas.c~dcdbas-use-memory_read_from_buffer drivers/firmware/dcdbas.c
--- a/drivers/firmware/dcdbas.c~dcdbas-use-memory_read_from_buffer
+++ a/drivers/firmware/dcdbas.c
@@ -34,6 +34,7 @@
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/mutex.h>
+#include <linux/fs.h>
 #include <asm/io.h>
 
 #include "dcdbas.h"
@@ -152,20 +153,11 @@ static ssize_t smi_data_read(struct kobj
 			     struct bin_attribute *bin_attr,
 			     char *buf, loff_t pos, size_t count)
 {
-	size_t max_read;
 	ssize_t ret;
 
 	mutex_lock(&smi_data_lock);
-
-	if (pos >= smi_data_buf_size) {
-		ret = 0;
-		goto out;
-	}
-
-	max_read = smi_data_buf_size - pos;
-	ret = min(max_read, count);
-	memcpy(buf, smi_data_buf + pos, ret);
-out:
+	ret = memory_read_from_buffer(buf, count, &pos, smi_data_buf,
+					smi_data_buf_size);
 	mutex_unlock(&smi_data_lock);
 	return ret;
 }
_