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>

diff --git a/drivers/firmware/dcdbas.c b/drivers/firmware/dcdbas.c
index 0b624e9..c66817e 100644 (file)
--- 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;
 }