This is a note to let you know that I've just added the patch titled mtd: spi-nor: Check for zero erase size in spi_nor_find_best_erase_type() to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mtd-spi-nor-check-for-zero-erase-size-in-spi_nor_find_best_erase_type.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 2ebc336be08160debfe27f87660cf550d710f3e9 Mon Sep 17 00:00:00 2001 From: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxx> Date: Fri, 19 Nov 2021 09:14:12 +0100 Subject: mtd: spi-nor: Check for zero erase size in spi_nor_find_best_erase_type() From: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxx> commit 2ebc336be08160debfe27f87660cf550d710f3e9 upstream. Erase can be zeroed in spi_nor_parse_4bait() or spi_nor_init_non_uniform_erase_map(). In practice it happened with mt25qu256a, which supports 4K, 32K, 64K erases with 3b address commands, but only 4K and 64K erase with 4b address commands. Fixes: dc92843159a7 ("mtd: spi-nor: fix erase_type array to indicate current map conf") Signed-off-by: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxx> Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Link: https://lore.kernel.org/r/20211119081412.29732-1-alexander.sverdlin@xxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/mtd/spi-nor/spi-nor.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -1010,6 +1010,8 @@ spi_nor_find_best_erase_type(const struc continue; erase = &map->erase_type[i]; + if (!erase->size) + continue; /* Alignment is not mandatory for overlaid regions */ if (region->offset & SNOR_OVERLAID_REGION && Patches currently in stable-queue which might be from alexander.sverdlin@xxxxxxxxx are queue-5.4/mtd-spi-nor-check-for-zero-erase-size-in-spi_nor_find_best_erase_type.patch