mtd: nand: bch: switch to mtd_ooblayout_ops

Replace the nand_ecclayout definition by the equivalent mtd_ooblayout_ops
definition.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

drivers/mtd/nand/nand_base.c

@@ -4294,6 +4294,21 @@ int nand_scan_tail(struct mtd_info *mtd)
 			ecc->strength = 4;
 		}
 
+		/*
+		 * if no ecc placement scheme was provided pickup the default
+		 * large page one.
+		 */
+		if (!mtd->ooblayout) {
+			/* handle large page devices only */
+			if (mtd->oobsize < 64) {
+				WARN(1, "OOB layout is required when using software BCH on small pages\n");
+				ret = -EINVAL;
+				goto err_free;
+			}
+
+			mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
+		}
+
 		/* See nand_bch_init() for details. */
 		ecc->bytes = 0;
 		ecc->priv = nand_bch_init(mtd);

drivers/mtd/nand/nand_bch.c

@@ -32,13 +32,11 @@
 /**
  * struct nand_bch_control - private NAND BCH control structure
  * @bch:       BCH control structure
- * @ecclayout: private ecc layout for this BCH configuration
  * @errloc:    error location array
  * @eccmask:   XOR ecc mask, allows erased pages to be decoded as valid
  */
 struct nand_bch_control {
 	struct bch_control   *bch;
-	struct nand_ecclayout ecclayout;
 	unsigned int         *errloc;
 	unsigned char        *eccmask;
 };
@@ -124,7 +122,6 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 {
 	struct nand_chip *nand = mtd_to_nand(mtd);
 	unsigned int m, t, eccsteps, i;
-	struct nand_ecclayout *layout = nand->ecc.layout;
 	struct nand_bch_control *nbc = NULL;
 	unsigned char *erased_page;
 	unsigned int eccsize = nand->ecc.size;
@@ -161,35 +158,19 @@ struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
 
 	eccsteps = mtd->writesize/eccsize;
 
-	/* if no ecc placement scheme was provided, build one */
-	if (!layout) {
-
-		/* handle large page devices only */
-		if (mtd->oobsize < 64) {
-			printk(KERN_WARNING "must provide an oob scheme for "
-			       "oobsize %d\n", mtd->oobsize);
-			goto fail;
-		}
-
-		layout = &nbc->ecclayout;
-		layout->eccbytes = eccsteps*eccbytes;
+	/*
+	 * Rely on the default ecclayout to ooblayout wrapper provided by MTD
+	 * core if ecc.layout is not NULL.
+	 * FIXME: this should be removed when all callers have moved to the
+	 * mtd_ooblayout_ops approach.
+	 */
+	mtd_set_ecclayout(mtd, nand->ecc.layout);
 
-		/* reserve 2 bytes for bad block marker */
-		if (layout->eccbytes+2 > mtd->oobsize) {
-			printk(KERN_WARNING "no suitable oob scheme available "
-			       "for oobsize %d eccbytes %u\n", mtd->oobsize,
-			       eccbytes);
+	/* Check that we have an oob layout description. */
+	if (!mtd->ooblayout) {
+		pr_warn("missing oob scheme");
 		goto fail;
 	}
-		/* put ecc bytes at oob tail */
-		for (i = 0; i < layout->eccbytes; i++)
-			layout->eccpos[i] = mtd->oobsize-layout->eccbytes+i;
-
-		layout->oobfree[0].offset = 2;
-		layout->oobfree[0].length = mtd->oobsize-2-layout->eccbytes;
-
-		nand->ecc.layout = layout;
-	}
 
 	/* sanity checks */
 	if (8*(eccsize+eccbytes) >= (1 << m)) {