[patch -v3 14/22] dell_rbu: use memory_read_from_buffer

[Akinobu Mita <akinobu.mita@gmail.com>]

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Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Abhay Salunke <abhay_salunke@dell.com>
---
 drivers/firmware/dell_rbu.c |   29 ++++-------------------------
 1 file changed, 4 insertions(+), 25 deletions(-)

Index: 2.6-git/drivers/firmware/dell_rbu.c
===================================================================
--- 2.6-git.orig/drivers/firmware/dell_rbu.c
+++ 2.6-git/drivers/firmware/dell_rbu.c
@@ -44,6 +44,7 @@
 #include <linux/moduleparam.h>
 #include <linux/firmware.h>
 #include <linux/dma-mapping.h>
+#include <linux/fs.h>
 
 MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>");
 MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems");
@@ -507,11 +508,6 @@ static ssize_t read_packet_data(char *bu
 
 static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
 {
-	unsigned char *ptemp = NULL;
-	size_t bytes_left = 0;
-	size_t data_length = 0;
-	ssize_t ret_count = 0;
-
 	/* check to see if we have something to return */
 	if ((rbu_data.image_update_buffer == NULL) ||
 		(rbu_data.bios_image_size == 0)) {
@@ -519,28 +515,11 @@ static ssize_t read_rbu_mono_data(char *
 			"bios_image_size %lu\n",
 			rbu_data.image_update_buffer,
 			rbu_data.bios_image_size);
-		ret_count = -ENOMEM;
-		goto read_rbu_data_exit;
-	}
-
-	if (pos > rbu_data.bios_image_size) {
-		ret_count = 0;
-		goto read_rbu_data_exit;
+		return -ENOMEM;
 	}
 
-	bytes_left = rbu_data.bios_image_size - pos;
-	data_length = min(bytes_left, count);
-
-	ptemp = rbu_data.image_update_buffer;
-	memcpy(buffer, (ptemp + pos), data_length);
-
-	if ((pos + count) > rbu_data.bios_image_size)
-		/* this was the last copy */
-		ret_count = bytes_left;
-	else
-		ret_count = count;
-      read_rbu_data_exit:
-	return ret_count;
+	return memory_read_from_buffer(buffer, count, &pos,
+			rbu_data.image_update_buffer, rbu_data.bios_image_size);
 }
 
 static ssize_t read_rbu_data(struct kobject *kobj,

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