mtd: rawnand: Rename the use_bufpoi variables

Both in nand_do_read_ops() and nand_do_write_ops() there is a boolean
called use_bufpoi which is set to true in case of unaligned request or
when there is a need for a DMA-able buffer. It basically means "use a
bounce buffer".

Depending on the value of use_bufpoi, the bufpoi variable is always
used and will either point to the original buffer or to the nand_chip
structure "internal data buffer" (this buffer is allocated with
kmalloc() on purpose so that it will be DMA-compliant).

In all cases bufpoi is used so the boolean name is misleading. Rename
use_bufpoi to be use_bouce_buf to be more accurate.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200507105241.14299-6-miquel.raynal@bootlin.com

drivers/mtd/nand/raw/nand_base.c

@@ -3216,7 +3216,7 @@ static int nand_do_read_ops(struct nand_chip *chip, loff_t from,
 	uint32_t max_oobsize = mtd_oobavail(mtd, ops);
 
 	uint8_t *bufpoi, *oob, *buf;
-	int use_bufpoi;
+	int use_bounce_buf;
 	unsigned int max_bitflips = 0;
 	int retry_mode = 0;
 	bool ecc_fail = false;
@@ -3240,19 +3240,19 @@ static int nand_do_read_ops(struct nand_chip *chip, loff_t from,
 		aligned = (bytes == mtd->writesize);
 
 		if (!aligned)
-			use_bufpoi = 1;
+			use_bounce_buf = 1;
 		else if (chip->options & NAND_USES_DMA)
-			use_bufpoi = !virt_addr_valid(buf) ||
-				     !IS_ALIGNED((unsigned long)buf,
-						 chip->buf_align);
+			use_bounce_buf = !virt_addr_valid(buf) ||
+					 !IS_ALIGNED((unsigned long)buf,
+						     chip->buf_align);
 		else
-			use_bufpoi = 0;
+			use_bounce_buf = 0;
 
 		/* Is the current page in the buffer? */
 		if (realpage != chip->pagecache.page || oob) {
-			bufpoi = use_bufpoi ? chip->data_buf : buf;
+			bufpoi = use_bounce_buf ? chip->data_buf : buf;
 
-			if (use_bufpoi && aligned)
+			if (use_bounce_buf && aligned)
 				pr_debug("%s: using read bounce buffer for buf@%p\n",
 						 __func__, buf);
 
@@ -3273,7 +3273,7 @@ static int nand_do_read_ops(struct nand_chip *chip, loff_t from,
 				ret = chip->ecc.read_page(chip, bufpoi,
 							  oob_required, page);
 			if (ret < 0) {
-				if (use_bufpoi)
+				if (use_bounce_buf)
 					/* Invalidate page cache */
 					chip->pagecache.page = -1;
 				break;
@@ -3283,7 +3283,7 @@ static int nand_do_read_ops(struct nand_chip *chip, loff_t from,
 			 * Copy back the data in the initial buffer when reading
 			 * partial pages or when a bounce buffer is required.
 			 */
-			if (use_bufpoi) {
+			if (use_bounce_buf) {
 				if (!NAND_HAS_SUBPAGE_READ(chip) && !oob &&
 				    !(mtd->ecc_stats.failed - ecc_failures) &&
 				    (ops->mode != MTD_OPS_RAW)) {
@@ -4065,23 +4065,23 @@ static int nand_do_write_ops(struct nand_chip *chip, loff_t to,
 	while (1) {
 		int bytes = mtd->writesize;
 		uint8_t *wbuf = buf;
-		int use_bufpoi;
+		int use_bounce_buf;
 		int part_pagewr = (column || writelen < mtd->writesize);
 
 		if (part_pagewr)
-			use_bufpoi = 1;
+			use_bounce_buf = 1;
 		else if (chip->options & NAND_USES_DMA)
-			use_bufpoi = !virt_addr_valid(buf) ||
-				     !IS_ALIGNED((unsigned long)buf,
-						 chip->buf_align);
+			use_bounce_buf = !virt_addr_valid(buf) ||
+					 !IS_ALIGNED((unsigned long)buf,
+						     chip->buf_align);
 		else
-			use_bufpoi = 0;
+			use_bounce_buf = 0;
 
 		/*
 		 * Copy the data from the initial buffer when doing partial page
 		 * writes or when a bounce buffer is required.
 		 */
-		if (use_bufpoi) {
+		if (use_bounce_buf) {
 			pr_debug("%s: using write bounce buffer for buf@%p\n",
 					 __func__, buf);
 			if (part_pagewr)