[patch -v3 15/22] firmware: 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: Greg Kroah-Hartman <greg@kroah.com>
---
 drivers/base/firmware_class.c |   13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

Index: 2.6-git/drivers/base/firmware_class.c
===================================================================
--- 2.6-git.orig/drivers/base/firmware_class.c
+++ 2.6-git/drivers/base/firmware_class.c
@@ -17,6 +17,7 @@
 #include <linux/bitops.h>
 #include <linux/mutex.h>
 #include <linux/kthread.h>
+#include <linux/fs.h>
 
 #include <linux/firmware.h>
 #include "base.h"
@@ -176,7 +177,7 @@ firmware_data_read(struct kobject *kobj,
 	struct device *dev = to_dev(kobj);
 	struct firmware_priv *fw_priv = dev_get_drvdata(dev);
 	struct firmware *fw;
-	ssize_t ret_count = count;
+	ssize_t ret_count;
 
 	mutex_lock(&fw_lock);
 	fw = fw_priv->fw;
@@ -184,14 +185,8 @@ firmware_data_read(struct kobject *kobj,
 		ret_count = -ENODEV;
 		goto out;
 	}
-	if (offset > fw->size) {
-		ret_count = 0;
-		goto out;
-	}
-	if (offset + ret_count > fw->size)
-		ret_count = fw->size - offset;
-
-	memcpy(buffer, fw->data + offset, ret_count);
+	ret_count = memory_read_from_buffer(buffer, count, &offset,
+						fw->data, fw->size);
 out:
 	mutex_unlock(&fw_lock);
 	return ret_count;

--