8 files changed, 13 insertions, 3 deletions

diff --git a/drivers/mtd/chips/amd_flash.c b/drivers/mtd/chips/amd_flash.c
index 9e466509a23d..16eaca69fb5a 100644
--- a/drivers/mtd/chips/amd_flash.c
+++ b/drivers/mtd/chips/amd_flash.c
@@ -730,6 +730,7 @@ static struct mtd_info *amd_flash_probe(struct map_info *map)
                 offset += dev_size;
         }
         mtd->type = MTD_NORFLASH;
+        mtd->writesize = 1;
         mtd->flags = MTD_CAP_NORFLASH;
         mtd->name = map->name;
         mtd->erase = amd_flash_erase;
diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index 3aeb0c79e714..1e01ad38b26e 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -236,6 +236,7 @@ struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary)
         mtd->resume  = cfi_amdstd_resume;
         mtd->flags   = MTD_CAP_NORFLASH;
         mtd->name    = map->name;
+        mtd->writesize = 1;
 
         if (cfi->cfi_mode==CFI_MODE_CFI){
                 unsigned char bootloc;
diff --git a/drivers/mtd/chips/sharp.c b/drivers/mtd/chips/sharp.c
index 3cc0b23c5865..967abbecdff9 100644
--- a/drivers/mtd/chips/sharp.c
+++ b/drivers/mtd/chips/sharp.c
@@ -140,6 +140,7 @@ static struct mtd_info *sharp_probe(struct map_info *map)
         mtd->suspend = sharp_suspend;
         mtd->resume = sharp_resume;
         mtd->flags = MTD_CAP_NORFLASH;
+        mtd->writesize = 1;
         mtd->name = map->name;
 
         memset(sharp, 0, sizeof(*sharp));
diff --git a/drivers/mtd/devices/lart.c b/drivers/mtd/devices/lart.c
index 29b0ddaa324e..4ea50a1dda85 100644
--- a/drivers/mtd/devices/lart.c
+++ b/drivers/mtd/devices/lart.c
@@ -635,6 +635,7 @@ int __init lart_flash_init (void)
    printk ("%s: This looks like a LART board to me.\n",module_name);
    mtd.name = module_name;
    mtd.type = MTD_NORFLASH;
+   mtd.writesize = 1;
    mtd.flags = MTD_CAP_NORFLASH;
    mtd.size = FLASH_BLOCKSIZE_PARAM * FLASH_NUMBLOCKS_16m_PARAM + FLASH_BLOCKSIZE_MAIN * FLASH_NUMBLOCKS_16m_MAIN;
    mtd.erasesize = FLASH_BLOCKSIZE_MAIN;
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 04e65d5dae00..a8466141e914 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -465,6 +465,7 @@ static int __devinit m25p_probe(struct spi_device *spi)
                 flash->mtd.name = spi->dev.bus_id;
 
         flash->mtd.type = MTD_NORFLASH;
+        flash->mtd.writesize = 1;
         flash->mtd.flags = MTD_CAP_NORFLASH;
         flash->mtd.size = info->sector_size * info->n_sectors;
         flash->mtd.erasesize = info->sector_size;
diff --git a/drivers/mtd/devices/mtdram.c b/drivers/mtd/devices/mtdram.c
index f284c9670be8..8ab4b931215f 100644
--- a/drivers/mtd/devices/mtdram.c
+++ b/drivers/mtd/devices/mtdram.c
@@ -106,6 +106,7 @@ int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,
         mtd->type = MTD_GENERIC_TYPE;
         mtd->flags = MTD_CAP_RAM;
         mtd->size = size;
+        mtd->writesize = 1;
         mtd->erasesize = MTDRAM_ERASE_SIZE;
         mtd->priv = mapped_address;
 
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 49bc9fdcb88b..16a952dd486a 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -47,6 +47,7 @@ int add_mtd_device(struct mtd_info *mtd)
 {
         int i;
 
+        BUG_ON(mtd->writesize == 0);
         mutex_lock(&mtd_table_mutex);
 
         for (i=0; i < MAX_MTD_DEVICES; i++)
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 9536567d041b..e1d2a3d56546 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -110,9 +110,12 @@ struct mtd_info {
          * information below if they desire
          */
         u_int32_t erasesize;
-        /* Smallest availlable size for writing to the device.  For NAND,
-         * this is the page size, for some NOR chips, the size of ECC
-         * covered blocks.
+        /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
+         * though individual bits can be cleared), in case of NAND flash it is
+         * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
+         * it is of ECC block size, etc. It is illegal to have writesize = 0.
+         * Any driver registering a struct mtd_info must ensure a writesize of
+         * 1 or larger.
          */
         u_int32_t writesize;