dell_rbu: use memory_read_from_buffer()

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Abhay Salunke <Abhay_Salunke@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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 25 deletions

diff --git a/drivers/firmware/dell_rbu.c b/drivers/firmware/dell_rbu.c
index 7430e218cda6..13946ebd77d6 100644
--- a/drivers/firmware/dell_rbu.c
+++ b/drivers/firmware/dell_rbu.c
@@ -507,11 +507,6 @@ static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
 
 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 +514,11 @@ static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
                         "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,