Merge branch 'for-2.6.37/drivers' of git://git.kernel.dk/linux-2.6-block

[pandora-kernel.git] / drivers / mtd / mtdconcat.c

diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index 7e07562..bf8de09 100644 (file)
--- 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)