Subject: [PATCH v3 02/40] mtd: rawnand: Add an invalid ECC mode to discriminate with valid ones

From: Miquel Raynal <[email-masked]>
Date: Thu, 19 Sep 2019 21:31:02 +0200

NAND ECC modes (or providers) have their own enumeration but, unlike
their algorithms counterpart, there is no invalid or uninitialized
value to discriminate between an error and having chosen a no-ECC
situation. Add an "invalid" entry for this purpose.

Signed-off-by: Miquel Raynal <[email-masked]>
---
 drivers/mtd/nand/raw/nand_base.c | 2 +-
 include/linux/mtd/rawnand.h      | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 3bf2d56eced2..e6c483ec191a 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -4851,7 +4851,7 @@ static int of_get_nand_ecc_mode(struct device_node *np)
 	if (err < 0)
 		return err;
 
-	for (i = 0; i < ARRAY_SIZE(nand_ecc_modes); i++)
+	for (i = NAND_ECC_NONE; i < ARRAY_SIZE(nand_ecc_modes); i++)
 		if (!strcasecmp(pm, nand_ecc_modes[i]))
 			return i;
 
diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index cd834e9f7e78..ccdc0c314acc 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -84,6 +84,7 @@ struct nand_chip;
  * Constants for ECC_MODES
  */
 enum nand_ecc_mode {
+	NAND_ECC_INVALID,
 	NAND_ECC_NONE,
 	NAND_ECC_SOFT,
 	NAND_ECC_HW,
-- 
2.20.1

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