From b59d02becc8714fa629cbccb3933db15d9ee110b Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Sun, 13 Aug 2023 14:52:44 +0100 Subject: [PATCH] generic: backport fix for Winbond SPI NAND Avoid using stack allocated memory for DMA operations. Fixes: 156c00dedc ("generic: backport Winbond W25N02KV SPI-NAND support") Signed-off-by: Daniel Golle (cherry picked from commit e6f8b699189139f09c3685332310ff870610de5e) --- ...d-spinand-winbond-Fix-ecc_get_status.patch | 49 +++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 target/linux/generic/backport-5.15/892-v6.5-mtd-spinand-winbond-Fix-ecc_get_status.patch diff --git a/target/linux/generic/backport-5.15/892-v6.5-mtd-spinand-winbond-Fix-ecc_get_status.patch b/target/linux/generic/backport-5.15/892-v6.5-mtd-spinand-winbond-Fix-ecc_get_status.patch new file mode 100644 index 0000000000..2f408f5a30 --- /dev/null +++ b/target/linux/generic/backport-5.15/892-v6.5-mtd-spinand-winbond-Fix-ecc_get_status.patch @@ -0,0 +1,49 @@ +From f5a05060670a4d8d6523afc7963eb559c2e3615f Mon Sep 17 00:00:00 2001 +From: Olivier Maignial +Date: Fri, 23 Jun 2023 17:33:37 +0200 +Subject: [PATCH] mtd: spinand: winbond: Fix ecc_get_status + +Reading ECC status is failing. + +w25n02kv_ecc_get_status() is using on-stack buffer for +SPINAND_GET_FEATURE_OP() output. It is 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 + +Fixes: 6154c7a58348 ("mtd: spinand: winbond: add Winbond W25N02KV flash support") +Cc: stable@vger.kernel.org +Signed-off-by: Olivier Maignial +Signed-off-by: Miquel Raynal +Link: https://lore.kernel.org/linux-mtd/DB4P250MB1032EDB9E36B764A33769039FE23A@DB4P250MB1032.EURP250.PROD.OUTLOOK.COM +--- + drivers/mtd/nand/spi/winbond.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +--- a/drivers/mtd/nand/spi/winbond.c ++++ b/drivers/mtd/nand/spi/winbond.c +@@ -108,7 +108,7 @@ static int w25n02kv_ecc_get_status(struc + { + 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(struc + 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; -- 2.30.2