linux-kernel - [PATCH] mtd: spinand: winbond|toshiba: Fix ecc_get

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Date:   Tue, 20 Jun 2023 23:16:15 +0200
From:   Olivier Maignial <olivier.maignial@...mail.fr>
To:     unlisted-recipients:; (no To-header on input)
Cc:     olivier.maignial@...fy.com,
        Olivier Maignial <olivier.maignial@...mail.fr>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Mikhail Kshevetskiy <mikhail.kshevetskiy@...sys.eu>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mtd: spinand: winbond|toshiba: Fix ecc_get_status

Reading ECC status is failing in toshiba & winbond spi-nand drivers.

tx58cxgxsxraix_ecc_get_status() and w25n02kv_ecc_get_status()
functions are using on-stack buffers which are not suitable
for DMA needs of spi-mem.

Fix this by using the spi-mem operations dedicated buffer
spinand->scratchbuf

See
spinand->scratchbuf:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/mtd/spinand.h?h=v6.3#n418
spi_mem_check_op():
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/spi/spi-mem.c?h=v6.3#n199

Signed-off-by: Olivier Maignial <olivier.maignial@...mail.fr>
---
 drivers/mtd/nand/spi/toshiba.c | 4 ++--
 drivers/mtd/nand/spi/winbond.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/spi/toshiba.c b/drivers/mtd/nand/spi/toshiba.c
index 7380b1ebaccd..a80427c13121 100644
--- a/drivers/mtd/nand/spi/toshiba.c
+++ b/drivers/mtd/nand/spi/toshiba.c
@@ -73,7 +73,7 @@ static int tx58cxgxsxraix_ecc_get_status(struct spinand_device *spinand,
 {
 	struct nand_device *nand = spinand_to_nand(spinand);
 	u8 mbf = 0;
-	struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, &mbf);
+	struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, spinand->scratchbuf);
 
 	switch (status & STATUS_ECC_MASK) {
 	case STATUS_ECC_NO_BITFLIPS:
@@ -92,7 +92,7 @@ static int tx58cxgxsxraix_ecc_get_status(struct spinand_device *spinand,
 		if (spi_mem_exec_op(spinand->spimem, &op))
 			return nanddev_get_ecc_conf(nand)->strength;
 
-		mbf >>= 4;
+		mbf = *(spinand->scratchbuf) >> 4;
 
 		if (WARN_ON(mbf > nanddev_get_ecc_conf(nand)->strength || !mbf))
 			return nanddev_get_ecc_conf(nand)->strength;
diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c
index 3ad58cd284d8..f507e3759301 100644
--- a/drivers/mtd/nand/spi/winbond.c
+++ b/drivers/mtd/nand/spi/winbond.c
@@ -108,7 +108,7 @@ static int w25n02kv_ecc_get_status(struct spinand_device *spinand,
 {
 	struct nand_device *nand = spinand_to_nand(spinand);
 	u8 mbf = 0;
-	struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, &mbf);
+	struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, spinand->scratchbuf);
 
 	switch (status & STATUS_ECC_MASK) {
 	case STATUS_ECC_NO_BITFLIPS:
@@ -126,7 +126,7 @@ static int w25n02kv_ecc_get_status(struct spinand_device *spinand,
 		if (spi_mem_exec_op(spinand->spimem, &op))
 			return nanddev_get_ecc_conf(nand)->strength;
 
-		mbf >>= 4;
+		mbf = *(spinand->scratchbuf) >> 4;
 
 		if (WARN_ON(mbf > nanddev_get_ecc_conf(nand)->strength || !mbf))
 			return nanddev_get_ecc_conf(nand)->strength;
-- 
2.34.1