mtd: spi-nor: Check for zero erase size in spi_nor_find_best_erase_type()

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@nokia.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20211119081412.29732-1-alexander.sverdlin@nokia.com

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index aa05443..0079758 100644 (file)
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -1184,6 +1184,8 @@ spi_nor_find_best_erase_type(const struct spi_nor_erase_map *map,
                        continue;
 
                erase = &map->erase_type[i];
+               if (!erase->size)
+                       continue;
 
                /* Alignment is not mandatory for overlaid regions */
                if (region->offset & SNOR_OVERLAID_REGION &&