mtd: nand: ecc-hamming: Use the public nsteps field

The software Hamming ECC engine stores the nsteps variable in its own
private structure while it is also exported as a public ECC field.

Let's get rid of the redundant private one and let's use the
nand_ecc_context structure when possible.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Tested-by: Adam Ford <aford173@gmail.com> #logicpd Torpedo
Link: https://lore.kernel.org/linux-mtd/20210127203020.9574-10-miquel.raynal@bootlin.com

drivers/mtd/nand/ecc-sw-hamming.c

@@ -504,7 +504,6 @@ int nand_ecc_sw_hamming_init_ctx(struct nand_device *nand)
 		goto free_engine_conf;
 
 	engine_conf->code_size = 3;
-	engine_conf->nsteps = mtd->writesize / conf->step_size;
 	engine_conf->calc_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
 	engine_conf->code_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
 	if (!engine_conf->calc_buf || !engine_conf->code_buf) {
@@ -514,7 +513,7 @@ int nand_ecc_sw_hamming_init_ctx(struct nand_device *nand)
 
 	nand->ecc.ctx.priv = engine_conf;
 	nand->ecc.ctx.nsteps = mtd->writesize / conf->step_size;
-	nand->ecc.ctx.total = engine_conf->nsteps * engine_conf->code_size;
+	nand->ecc.ctx.total = nand->ecc.ctx.nsteps * engine_conf->code_size;
 
 	return 0;
 
@@ -549,7 +548,7 @@ static int nand_ecc_sw_hamming_prepare_io_req(struct nand_device *nand,
 	struct mtd_info *mtd = nanddev_to_mtd(nand);
 	int eccsize = nand->ecc.ctx.conf.step_size;
 	int eccbytes = engine_conf->code_size;
-	int eccsteps = engine_conf->nsteps;
+	int eccsteps = nand->ecc.ctx.nsteps;
 	int total = nand->ecc.ctx.total;
 	u8 *ecccalc = engine_conf->calc_buf;
 	const u8 *data;
@@ -587,7 +586,7 @@ static int nand_ecc_sw_hamming_finish_io_req(struct nand_device *nand,
 	int eccsize = nand->ecc.ctx.conf.step_size;
 	int total = nand->ecc.ctx.total;
 	int eccbytes = engine_conf->code_size;
-	int eccsteps = engine_conf->nsteps;
+	int eccsteps = nand->ecc.ctx.nsteps;
 	u8 *ecccalc = engine_conf->calc_buf;
 	u8 *ecccode = engine_conf->code_buf;
 	unsigned int max_bitflips = 0;
@@ -619,7 +618,7 @@ static int nand_ecc_sw_hamming_finish_io_req(struct nand_device *nand,
 		nand_ecc_sw_hamming_calculate(nand, data, &ecccalc[i]);
 
 	/* Finish a page read: compare and correct */
-	for (eccsteps = engine_conf->nsteps, i = 0, data = req->databuf.in;
+	for (eccsteps = nand->ecc.ctx.nsteps, i = 0, data = req->databuf.in;
 	     eccsteps;
 	     eccsteps--, i += eccbytes, data += eccsize) {
 		int stat =  nand_ecc_sw_hamming_correct(nand, data,

include/linux/mtd/nand-ecc-sw-hamming.h

@@ -17,7 +17,6 @@
  * @req_ctx: Save request context and tweak the original request to fit the
  *           engine needs
  * @code_size: Number of bytes needed to store a code (one code per step)
- * @nsteps: Number of steps
  * @calc_buf: Buffer to use when calculating ECC bytes
  * @code_buf: Buffer to use when reading (raw) ECC bytes from the chip
  * @sm_order: Smart Media special ordering
@@ -25,7 +24,6 @@
 struct nand_ecc_sw_hamming_conf {
 	struct nand_ecc_req_tweak_ctx req_ctx;
 	unsigned int code_size;
-	unsigned int nsteps;
 	u8 *calc_buf;
 	u8 *code_buf;
 	unsigned int sm_order;