diff options
| author | Boris Brezillon <boris.brezillon@free-electrons.com> | 2018-01-09 11:50:34 +0300 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2018-01-16 17:23:21 +0300 |
| commit | 24ff12922278573b1e4c54b4898ab7a3c64be960 (patch) | |
| tree | 530fb669aac994de12e307cf92e83ffb21ef1c88 /drivers/mtd/mtdcore.c | |
| parent | d020fc8e5089dd6c60b1638030e0046dffa0fdbc (diff) | |
| download | linux-24ff12922278573b1e4c54b4898ab7a3c64be960.tar.xz | |
mtd: Fallback to ->_read/write_oob() when ->_read/write() is missing
Some MTD sublayers/drivers are implementing ->_read/write_oob() and
provide dummy wrappers for their ->_read/write() implementations.
Let the core handle this case instead of duplicating the logic.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Tested-by: Ladislav Michl <ladis@linux-mips.org>
Diffstat (limited to 'drivers/mtd/mtdcore.c')
| -rw-r--r-- | drivers/mtd/mtdcore.c | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 642c35dde686..d7ab091b36b2 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -1058,7 +1058,20 @@ int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, * representing the maximum number of bitflips that were corrected on * any one ecc region (if applicable; zero otherwise). */ - ret_code = mtd->_read(mtd, from, len, retlen, buf); + if (mtd->_read) { + ret_code = mtd->_read(mtd, from, len, retlen, buf); + } else if (mtd->_read_oob) { + struct mtd_oob_ops ops = { + .len = len, + .datbuf = buf, + }; + + ret_code = mtd->_read_oob(mtd, from, &ops); + *retlen = ops.retlen; + } else { + return -ENOTSUPP; + } + if (unlikely(ret_code < 0)) return ret_code; if (mtd->ecc_strength == 0) @@ -1073,11 +1086,25 @@ int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, *retlen = 0; if (to < 0 || to >= mtd->size || len > mtd->size - to) return -EINVAL; - if (!mtd->_write || !(mtd->flags & MTD_WRITEABLE)) + if ((!mtd->_write && !mtd->_write_oob) || + !(mtd->flags & MTD_WRITEABLE)) return -EROFS; if (!len) return 0; ledtrig_mtd_activity(); + + if (!mtd->_write) { + struct mtd_oob_ops ops = { + .len = len, + .datbuf = (u8 *)buf, + }; + int ret; + + ret = mtd->_write_oob(mtd, to, &ops); + *retlen = ops.retlen; + return ret; + } + return mtd->_write(mtd, to, len, retlen, buf); } EXPORT_SYMBOL_GPL(mtd_write); |