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-rw-r--r--drivers/mtd/mtdconcat.c38
1 files changed, 28 insertions, 10 deletions
diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index 7e075621bbf4..bf8de0943103 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -1,11 +1,25 @@
/*
* MTD device concatenation layer
*
- * (C) 2002 Robert Kaiser <rkaiser@sysgo.de>
+ * Copyright © 2002 Robert Kaiser <rkaiser@sysgo.de>
+ * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org>
*
* NAND support by Christian Gan <cgan@iders.ca>
*
- * This code is GPL
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
*/
#include <linux/kernel.h>
@@ -540,10 +554,12 @@ static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
else
size = len;
- err = subdev->lock(subdev, ofs, size);
-
- if (err)
- break;
+ if (subdev->lock) {
+ err = subdev->lock(subdev, ofs, size);
+ if (err)
+ break;
+ } else
+ err = -EOPNOTSUPP;
len -= size;
if (len == 0)
@@ -578,10 +594,12 @@ static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
else
size = len;
- err = subdev->unlock(subdev, ofs, size);
-
- if (err)
- break;
+ if (subdev->unlock) {
+ err = subdev->unlock(subdev, ofs, size);
+ if (err)
+ break;
+ } else
+ err = -EOPNOTSUPP;
len -= size;
if (len == 0)