linux-kernel - [PATCH v2 3/3] mtd: spinand: Don not erase the block before writing a bad block marker

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Date:   Mon, 17 Feb 2020 15:54:12 +0000
From:   Schrempf Frieder <frieder.schrempf@...tron.de>
To:     Boris Brezillon <bbrezillon@...nel.org>,
        Schrempf Frieder <frieder.schrempf@...tron.de>,
        Jeff Kletsky <git-commits@...ycomm.com>,
        liaoweixiong <liaoweixiong@...winnertech.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
CC:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "Richard Weinberger" <richard@....at>
Subject: [PATCH v2 3/3] mtd: spinand: Don not erase the block before writing a
 bad block marker

From: Frieder Schrempf <frieder.schrempf@...tron.de>

Currently when marking a block, we use spinand_erase_op() to erase
the block before writing the marker to the OOB area. Doing so without
waiting for the operation to finish can lead to the marking failing
silently and no bad block marker being written to the flash.

In fact we don't need to do an erase at all before writing the BBM.
The ECC is disabled for the raw access to the OOB data and we don't
need to work around any issues with chips reporting ECC errors as it
is known to be the case for raw NAND.

Fixes: 7529df465248 ("mtd: nand: Add core infrastructure to support SPI NANDs")
Cc: stable@...r.kernel.org
Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
---
Changes in v2:
 * Instead of waiting for the erase operation to finish, just don't
   do an erase at all, as it is not needed.
 * Update the commit message
---
 drivers/mtd/nand/spi/core.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index a94287884453..8dda51bbdd11 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -613,7 +613,6 @@ static int spinand_markbad(struct nand_device *nand, const struct nand_pos *pos)
 	};
 	int ret;
 
-	/* Erase block before marking it bad. */
 	ret = spinand_select_target(spinand, pos->target);
 	if (ret)
 		return ret;
@@ -622,8 +621,6 @@ static int spinand_markbad(struct nand_device *nand, const struct nand_pos *pos)
 	if (ret)
 		return ret;
 
-	spinand_erase_op(spinand, pos);
-
 	return spinand_write_page(spinand, &req);
 }
 
-- 
2.17.1