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authorDavid Howells <dhowells@redhat.com>2009-02-12 10:40:00 +0000
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-03-24 09:00:19 +0000
commit402d326519c1a4859c527702383f4e60f606ef52 (patch)
treebeb302d56d7671d372ae73f2664feed2a5b1226d /drivers/mtd/mtdcore.c
parent9ce969082e490d0a5a81862b364337c93dc3482a (diff)
downloadop-kernel-dev-402d326519c1a4859c527702383f4e60f606ef52.zip
op-kernel-dev-402d326519c1a4859c527702383f4e60f606ef52.tar.gz
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>
Diffstat (limited to 'drivers/mtd/mtdcore.c')
-rw-r--r--drivers/mtd/mtdcore.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 76fe0a1..65a7f37 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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