mtd: atmel_nand: add a definition for the oob reserved bytes

It's better to use a macro instead of just a number.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

2 files changed, 6 insertions, 2 deletions

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index feaac9099bb9..0361c1992673 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -485,7 +485,7 @@ static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
         for (i = 0; i < ecc_len; i++)
                 layout->eccpos[i] = oobsize - ecc_len + i;
 
-        layout->oobfree[0].offset = 2;
+        layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
         layout->oobfree[0].length =
                 oobsize - ecc_len - layout->oobfree[0].offset;
 }
@@ -1254,7 +1254,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
                 nand_chip->ecc.steps = mtd->writesize / sector_size;
                 nand_chip->ecc.total = nand_chip->ecc.bytes *
                         nand_chip->ecc.steps;
-                if (nand_chip->ecc.total > mtd->oobsize - 2) {
+                if (nand_chip->ecc.total >
+                                mtd->oobsize - PMECC_OOB_RESERVED_BYTES) {
                         dev_err(host->dev, "No room for ECC bytes\n");
                         err_no = -EINVAL;
                         goto err;
diff --git a/drivers/mtd/nand/atmel_nand_ecc.h b/drivers/mtd/nand/atmel_nand_ecc.h
index d4035e335ad8..668e7358f19b 100644
--- a/drivers/mtd/nand/atmel_nand_ecc.h
+++ b/drivers/mtd/nand/atmel_nand_ecc.h
@@ -152,4 +152,7 @@
 /* Time out value for reading PMECC status register */
 #define PMECC_MAX_TIMEOUT_MS                    100
 
+/* Reserved bytes in oob area */
+#define PMECC_OOB_RESERVED_BYTES                2
+
 #endif