diff options
| author | Boris Brezillon <boris.brezillon@free-electrons.com> | 2017-12-15 15:39:52 +0300 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2018-01-06 17:09:54 +0300 |
| commit | f72071b892d6f5eccf90756f3c12b1422bd4b474 (patch) | |
| tree | da54f4c67f3d7e598e03df9203e86ac40ab21bfe /include/linux/mtd/mtd.h | |
| parent | 33f45c44d68b3593826524ba6d02bd9cce9e101e (diff) | |
| download | linux-f72071b892d6f5eccf90756f3c12b1422bd4b474.tar.xz | |
mtd: Add an helper to make erase request aligned on ->erasesize
There's currently nothing forcing alignment of einfo->addr and
einfo->len on mtd->erasesize. Since we don't know if automatically
aligning those field in mtd_erase() will hurt some drivers, we add an
helper function to let drivers that need such an alignment explicitly
ask for it.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Diffstat (limited to 'include/linux/mtd/mtd.h')
| -rw-r--r-- | include/linux/mtd/mtd.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index cd55bf14ad51..205ededccc60 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -489,6 +489,34 @@ static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd) return do_div(sz, mtd->erasesize); } +/** + * mtd_align_erase_req - Adjust an erase request to align things on eraseblock + * boundaries. + * @mtd: the MTD device this erase request applies on + * @req: the erase request to adjust + * + * This function will adjust @req->addr and @req->len to align them on + * @mtd->erasesize. Of course we expect @mtd->erasesize to be != 0. + */ +static inline void mtd_align_erase_req(struct mtd_info *mtd, + struct erase_info *req) +{ + u32 mod; + + if (WARN_ON(!mtd->erasesize)) + return; + + mod = mtd_mod_by_eb(req->addr, mtd); + if (mod) { + req->addr -= mod; + req->len += mod; + } + + mod = mtd_mod_by_eb(req->addr + req->len, mtd); + if (mod) + req->len += mtd->erasesize - mod; +} + static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd) { if (mtd->writesize_shift) |