mtd: nand: remove unused NAND_OWN_BUFFERS flag

The last/only user of NAND_OWN_BUFFERS (cafe_nand.c) has been reworked.
This flag is no longer needed.
Suggested-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

drivers/mtd/nand/nand_base.c

@@ -5319,7 +5319,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 		return -EINVAL;
 	}
 
-	if (!(chip->options & NAND_OWN_BUFFERS)) {
 	nbuf = kzalloc(sizeof(*nbuf), GFP_KERNEL);
 	if (!nbuf)
 		return -ENOMEM;
@@ -5336,17 +5335,13 @@ int nand_scan_tail(struct mtd_info *mtd)
 		goto err_free_nbuf;
 	}
 
-		nbuf->databuf = kmalloc(mtd->writesize + mtd->oobsize,
-					GFP_KERNEL);
+	nbuf->databuf = kmalloc(mtd->writesize + mtd->oobsize, GFP_KERNEL);
 	if (!nbuf->databuf) {
 		ret = -ENOMEM;
 		goto err_free_nbuf;
 	}
 
 	chip->buffers = nbuf;
-	} else if (!chip->buffers) {
-		return -ENOMEM;
-	}
 
 	/*
 	 * FIXME: some NAND manufacturer drivers expect the first die to be
@@ -5701,7 +5696,7 @@ void nand_cleanup(struct nand_chip *chip)
 
 	/* Free bad block table memory */
 	kfree(chip->bbt);
-	if (!(chip->options & NAND_OWN_BUFFERS) && chip->buffers) {
+	if (chip->buffers) {
 		kfree(chip->buffers->databuf);
 		kfree(chip->buffers->ecccode);
 		kfree(chip->buffers->ecccalc);

include/linux/mtd/rawnand.h

@@ -185,11 +185,6 @@ enum nand_ecc_algo {
 /* Non chip related options */
 /* This option skips the bbt scan during initialization. */
 #define NAND_SKIP_BBTSCAN	0x00010000
-/*
- * This option is defined if the board driver allocates its own buffers
- * (e.g. because it needs them DMA-coherent).
- */
-#define NAND_OWN_BUFFERS	0x00020000
 /* Chip may not exist, so silence any errors in scan */
 #define NAND_SCAN_SILENT_NODEV	0x00040000
 /*