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Commit f72071b8 authored by Boris Brezillon's avatar Boris Brezillon
Browse files

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: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: default avatarMiquel Raynal <miquel.raynal@free-electrons.com>
parent 33f45c44

include/linux/mtd/mtd.h

+28 −0
Original line number Diff line number Diff line
@@ -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)