From 402d326519c1a4859c527702383f4e60f606ef52 Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Thu, 12 Feb 2009 10:40:00 +0000
Subject: NOMMU: Present backing device capabilities for MTD chardevs

Present backing device capabilities for MTD character device files to allow
NOMMU mmap to do direct mapping where possible.

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Bernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---
 drivers/mtd/mtdcore.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'drivers/mtd/mtdcore.c')

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 76fe0a1e7a5e..65a7f3703881 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -19,6 +19,7 @@
 #include <linux/proc_fs.h>
 
 #include <linux/mtd/mtd.h>
+#include "internal.h"
 
 #include "mtdcore.h"
 
@@ -46,6 +47,20 @@ int add_mtd_device(struct mtd_info *mtd)
 {
 	int i;
 
+	if (!mtd->backing_dev_info) {
+		switch (mtd->type) {
+		case MTD_RAM:
+			mtd->backing_dev_info = &mtd_bdi_rw_mappable;
+			break;
+		case MTD_ROM:
+			mtd->backing_dev_info = &mtd_bdi_ro_mappable;
+			break;
+		default:
+			mtd->backing_dev_info = &mtd_bdi_unmappable;
+			break;
+		}
+	}
+
 	BUG_ON(mtd->writesize == 0);
 	mutex_lock(&mtd_table_mutex);
 
-- 
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