From 5f898483af574699783ed81a7a7895414c94de07 Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Sat, 11 Mar 2023 02:38:59 +0000 Subject: [PATCH] generic: fix Macronix SPI-NAND driver Use scratch buffer for DMA operetations. Passing a pointer to a stack variable won't work and results in bogus bit flips being reported. Patch was submitted upstream and is part of Linux 6.3. Signed-off-by: Daniel Golle --- ...onix-use-scratch-buffer-for-DMA-oper.patch | 35 +++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 target/linux/generic/backport-5.15/423-v6.3-mtd-spinand-macronix-use-scratch-buffer-for-DMA-oper.patch diff --git a/target/linux/generic/backport-5.15/423-v6.3-mtd-spinand-macronix-use-scratch-buffer-for-DMA-oper.patch b/target/linux/generic/backport-5.15/423-v6.3-mtd-spinand-macronix-use-scratch-buffer-for-DMA-oper.patch new file mode 100644 index 000000000000..7dbc2717250b --- /dev/null +++ b/target/linux/generic/backport-5.15/423-v6.3-mtd-spinand-macronix-use-scratch-buffer-for-DMA-oper.patch @@ -0,0 +1,35 @@ +From ebed787a0becb9354f0a23620a5130cccd6c730c Mon Sep 17 00:00:00 2001 +From: Daniel Golle +Date: Thu, 19 Jan 2023 03:45:43 +0000 +Subject: [PATCH] mtd: spinand: macronix: use scratch buffer for DMA operation + +The mx35lf1ge4ab_get_eccsr() function uses an SPI DMA operation to +read the eccsr, hence the buffer should not be on stack. Since commit +380583227c0c7f ("spi: spi-mem: Add extra sanity checks on the op param") +the kernel emmits a warning and blocks such operations. + +Use the scratch buffer to get eccsr instead of trying to directly read +into a stack-allocated variable. + +Signed-off-by: Daniel Golle +Reviewed-by: Dhruva Gole +Signed-off-by: Miquel Raynal +Link: https://lore.kernel.org/linux-mtd/Y8i85zM0u4XdM46z@makrotopia.org +--- + drivers/mtd/nand/spi/macronix.c | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +--- a/drivers/mtd/nand/spi/macronix.c ++++ b/drivers/mtd/nand/spi/macronix.c +@@ -83,9 +83,10 @@ static int mx35lf1ge4ab_ecc_get_status(s + * in order to avoid forcing the wear-leveling layer to move + * data around if it's not necessary. + */ +- if (mx35lf1ge4ab_get_eccsr(spinand, &eccsr)) ++ if (mx35lf1ge4ab_get_eccsr(spinand, spinand->scratchbuf)) + return nanddev_get_ecc_conf(nand)->strength; + ++ eccsr = *spinand->scratchbuf; + if (WARN_ON(eccsr > nanddev_get_ecc_conf(nand)->strength || + !eccsr)) + return nanddev_get_ecc_conf(nand)->strength; -- 2.30.2