linux-kernel - [LINUX PATCH v18 1/2] mtd: rawnand: nand_micron: Do not over write driver's read_page()/write

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Date:   Mon, 15 Jul 2019 23:30:51 -0600
From:   Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
To:     miquel.raynal@...tlin.com, bbrezillon@...nel.org
Cc:     richard@....at, dwmw2@...radead.org, computersforpeace@...il.com,
        marek.vasut@...il.com, vigneshr@...com,
        yamada.masahiro@...ionext.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, michal.simek@...inx.com,
        svemula@...inx.com, nagasuresh12@...il.com,
        Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
Subject: [LINUX PATCH v18 1/2] mtd: rawnand: nand_micron: Do not over write driver's read_page()/write_page()

Add check before assigning chip->ecc.read_page() and chip->ecc.write_page()

Signed-off-by: Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
---
Changes in v18
 - None
---
 drivers/mtd/nand/raw/nand_micron.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_micron.c b/drivers/mtd/nand/raw/nand_micron.c
index cbd4f09ac178..565f2696c747 100644
--- a/drivers/mtd/nand/raw/nand_micron.c
+++ b/drivers/mtd/nand/raw/nand_micron.c
@@ -500,8 +500,11 @@ static int micron_nand_init(struct nand_chip *chip)
 		chip->ecc.size = 512;
 		chip->ecc.strength = chip->base.eccreq.strength;
 		chip->ecc.algo = NAND_ECC_BCH;
-		chip->ecc.read_page = micron_nand_read_page_on_die_ecc;
-		chip->ecc.write_page = micron_nand_write_page_on_die_ecc;
+		if (!chip->ecc.read_page)
+			chip->ecc.read_page = micron_nand_read_page_on_die_ecc;
+
+		if (!chip->ecc.write_page)
+			chip->ecc.write_page = micron_nand_write_page_on_die_ecc;
 
 		if (ondie == MICRON_ON_DIE_MANDATORY) {
 			chip->ecc.read_page_raw = nand_read_page_raw_notsupp;
-- 
2.17.1