mtd: Remove duplicate checks on mtd_oob_ops parameter

Some of the check done in custom ->_read/write_oob() implementation are
already done by the core (in mtd_check_oob_ops()).

Suggested-by: Peter Pan <[e-mail]>
[Remove redundant checks done in mtdpart.c]
Signed-off-by: Boris Brezillon <[e-mail]>
Tested-by: Ladislav Michl <[e-mail]>

drivers/mtd/devices/docg3.c

···
 	if (ooblen % DOC_LAYOUT_OOB_SIZE)
 		return -EINVAL;
 
-	if (from + len > mtd->size)
-		return -EINVAL;
-
 	ops->oobretlen = 0;
 	ops->retlen = 0;
 	ret = 0;
···
 		return -EINVAL;
 	if (len && ooblen &&
 	    (len / DOC_LAYOUT_PAGE_SIZE) != (ooblen / oobdelta))
-		return -EINVAL;
-	if (ofs + len > mtd->size)
 		return -EINVAL;
 
 	ops->oobretlen = 0;

drivers/mtd/mtdpart.c

···
 	struct mtd_ecc_stats stats;
 	int res;
 
-	if (from >= mtd->size)
-		return -EINVAL;
-	if (ops->datbuf && from + ops->len > mtd->size)
-		return -EINVAL;
-
-	/*
-	 * If OOB is also requested, make sure that we do not read past the end
-	 * of this partition.
-	 */
-	if (ops->oobbuf) {
-		size_t len, pages;
-
-		len = mtd_oobavail(mtd, ops);
-		pages = mtd_div_by_ws(mtd->size, mtd);
-		pages -= mtd_div_by_ws(from, mtd);
-		if (ops->ooboffs + ops->ooblen > pages * len)
-			return -EINVAL;
-	}
-
 	stats = part->parent->ecc_stats;
 	res = part->parent->_read_oob(part->parent, from + part->offset, ops);
 	if (unlikely(mtd_is_eccerr(res)))
···
 {
 	struct mtd_part *part = mtd_to_part(mtd);
 
-	if (to >= mtd->size)
-		return -EINVAL;
-	if (ops->datbuf && to + ops->len > mtd->size)
-		return -EINVAL;
 	return part->parent->_write_oob(part->parent, to + part->offset, ops);
 }
 

drivers/mtd/nand/nand_base.c

···
 
 	len = mtd_oobavail(mtd, ops);
 
-	if (unlikely(ops->ooboffs >= len)) {
-		pr_debug("%s: attempt to start read outside oob\n",
-				__func__);
-		return -EINVAL;
-	}
-
-	/* Do not allow reads past end of device */
-	if (unlikely(from >= mtd->size ||
-		     ops->ooboffs + readlen > ((mtd->size >> chip->page_shift) -
-					(from >> chip->page_shift)) * len)) {
-		pr_debug("%s: attempt to read beyond end of device\n",
-				__func__);
-		return -EINVAL;
-	}
-
 	chipnr = (int)(from >> chip->chip_shift);
 	chip->select_chip(mtd, chipnr);
 
···
 	int ret;
 
 	ops->retlen = 0;
-
-	/* Do not allow reads past end of device */
-	if (ops->datbuf && (from + ops->len) > mtd->size) {
-		pr_debug("%s: attempt to read beyond end of device\n",
-				__func__);
-		return -EINVAL;
-	}
 
 	if (ops->mode != MTD_OPS_PLACE_OOB &&
 	    ops->mode != MTD_OPS_AUTO_OOB &&
···
 		return -EINVAL;
 	}
 
-	if (unlikely(ops->ooboffs >= len)) {
-		pr_debug("%s: attempt to start write outside oob\n",
-				__func__);
-		return -EINVAL;
-	}
-
-	/* Do not allow write past end of device */
-	if (unlikely(to >= mtd->size ||
-		     ops->ooboffs + ops->ooblen >
-			((mtd->size >> chip->page_shift) -
-			 (to >> chip->page_shift)) * len)) {
-		pr_debug("%s: attempt to write beyond end of device\n",
-				__func__);
-		return -EINVAL;
-	}
-
 	chipnr = (int)(to >> chip->chip_shift);
 
 	/*
···
 	int ret = -ENOTSUPP;
 
 	ops->retlen = 0;
-
-	/* Do not allow writes past end of device */
-	if (ops->datbuf && (to + ops->len) > mtd->size) {
-		pr_debug("%s: attempt to write beyond end of device\n",
-				__func__);
-		return -EINVAL;
-	}
 
 	nand_get_device(mtd, FL_WRITING);
 

drivers/mtd/onenand/onenand_base.c

···
 		return -EINVAL;
 	}
 
-	/* Do not allow reads past end of device */
-	if (unlikely(from >= mtd->size ||
-		     column + len > ((mtd->size >> this->page_shift) -
-				     (from >> this->page_shift)) * oobsize)) {
-		printk(KERN_ERR "%s: Attempted to read beyond end of device\n",
-			__func__);
-		return -EINVAL;
-	}
-
 	stats = mtd->ecc_stats;
 
 	readcmd = ONENAND_IS_4KB_PAGE(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
···
 	if (unlikely(column + len > oobsize)) {
 		printk(KERN_ERR "%s: Attempt to write past end of page\n",
 			__func__);
-		return -EINVAL;
-	}
-
-	/* Do not allow reads past end of device */
-	if (unlikely(to >= mtd->size ||
-		     column + len > ((mtd->size >> this->page_shift) -
-				     (to >> this->page_shift)) * oobsize)) {
-		printk(KERN_ERR "%s: Attempted to write past end of device\n",
-		       __func__);
 		return -EINVAL;
 	}