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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>
This commit is contained in:
Boris Brezillon 2017-12-15 13:39:52 +01:00
parent 33f45c44d6
commit f72071b892
1 changed files with 28 additions and 0 deletions
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28
include/linux/mtd/mtd.h
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@ -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)