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mtd: introduce mtd_has_oob helper

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We are working in the direction of making sure that MTD clients to not
use 'mtd->func' pointers directly. In some places we want to know if
OOB operations are supported by an MTD device. Introduce 'mtd_has_oob()'
helper for these purposes.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Artem Bityutskiy 2011-12-28 18:35:07 +02:00 committed by David Woodhouse
parent 33c87b4a2c
commit fc002e3c32
3 changed files with 8 additions and 3 deletions
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2
drivers/mtd/mtdchar.c
View File

@ -1004,7 +1004,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
break;
case MTD_FILE_MODE_RAW:
if (!mtd->read_oob || !mtd->write_oob)
if (!mtd_has_oob(mtd))
return -EOPNOTSUPP;
mfi->mode = arg;

4
drivers/mtd/sm_ftl.c
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@ -645,8 +645,8 @@ int sm_get_media_info(struct sm_ftl *ftl, struct mtd_info *mtd)
if (!ftl->smallpagenand && mtd->oobsize < SM_OOB_SIZE)
return -ENODEV;
/* We use these functions for IO */
if (!mtd->read_oob || !mtd->write_oob)
/* We use OOB */
if (!mtd_has_oob(mtd))
return -ENODEV;
/* Find geometry information */

5
include/linux/mtd/mtd.h
View File

@ -454,6 +454,11 @@ static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
return do_div(sz, mtd->writesize);
}
static inline int mtd_has_oob(const struct mtd_info *mtd)
{
return mtd->read_oob && mtd->write_oob;
}
/* Kernel-side ioctl definitions */
struct mtd_partition;