diff options
Diffstat (limited to 'drivers/mtd/mtdcore.c')
| -rw-r--r-- | drivers/mtd/mtdcore.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index b9adff543f5..374c46dff7d 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -858,6 +858,27 @@ int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, } EXPORT_SYMBOL_GPL(mtd_panic_write); +int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) +{ + int ret_code; + ops->retlen = ops->oobretlen = 0; + if (!mtd->_read_oob) + return -EOPNOTSUPP; + /* + * In cases where ops->datbuf != NULL, mtd->_read_oob() has semantics + * similar to mtd->_read(), returning a non-negative integer + * representing max bitflips. In other cases, mtd->_read_oob() may + * return -EUCLEAN. In all cases, perform similar logic to mtd_read(). + */ + ret_code = mtd->_read_oob(mtd, from, ops); + if (unlikely(ret_code < 0)) + return ret_code; + if (mtd->ecc_strength == 0) + return 0; /* device lacks ecc */ + return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; +} +EXPORT_SYMBOL_GPL(mtd_read_oob); + /* * Method to access the protection register area, present in some flash * devices. The user data is one time programmable but the factory data is read |