dcdbas: use memory_read_from_buffer()

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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 11 deletions

diff --git a/drivers/firmware/dcdbas.c b/drivers/firmware/dcdbas.c
index 0b624e927a6f..c66817e7717b 100644
--- a/drivers/firmware/dcdbas.c
+++ b/drivers/firmware/dcdbas.c
@@ -152,20 +152,11 @@ static ssize_t smi_data_read(struct kobject *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;
 }