lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

NOMMU: Present backing device capabilities for MTD chardevs

Browse Source 
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>
This commit is contained in:
David Howells
2009-02-12 10:40:00 +00:00
committed by David Woodhouse
parent 9ce969082e
commit 402d326519
10 changed files with 215 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/mtd/mtdcore.c
View File

@ -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);