diff options
| author |   David Howells <dhowells@redhat.com> | 2009-02-12 10:40:00 +0000 |
|---|---|---|
| committer |   David Woodhouse <David.Woodhouse@intel.com> | 2009-03-24 09:00:19 +0000 |
| commit | 402d326519c1a4859c527702383f4e60f606ef52 (patch) | |
| tree | beb302d56d7671d372ae73f2664feed2a5b1226d /drivers/mtd/mtdcore.c | |
| parent | [MTD] [OneNAND] Add write-while-program support (diff) | |
| download | linux-dev-402d326519c1a4859c527702383f4e60f606ef52.tar.xz linux-dev-402d326519c1a4859c527702383f4e60f606ef52.zip | |
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.c | 15 |
1 files changed, 15 insertions, 0 deletions
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); |