diff mbox series

[v3,3/3] mtd: spinand: Do not erase the block before writing a bad block marker

Message ID 20200218100432.32433-4-frieder.schrempf@kontron.de
State Accepted
Headers show
Series mtd: spinand: Fix reading and writing of bad block markers | expand

Commit Message

Frieder Schrempf Feb. 18, 2020, 10:05 a.m. UTC 
From: Frieder Schrempf <frieder.schrempf@kontron.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 raw accesses 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@vger.kernel.org
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Changes in v3:
 * Fix the subject line and the commit message
 * Add Boris' R-b tag

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(-)

Comments

Miquel Raynal March 10, 2020, 6:31 p.m. UTC | #1 
On Tue, 2020-02-18 at 10:05:35 UTC, Schrempf Frieder wrote:
> From: Frieder Schrempf <frieder.schrempf@kontron.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 raw accesses 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@vger.kernel.org
> Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
> Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel
diff mbox series

Patch

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);
 }