linux-kernel - [PATCH v2] mtd: spi-nor: Refactor spi_nor_read

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Date:   Sun, 23 Feb 2020 18:37:13 +0100
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     linux-mtd@...ts.infradead.org
Cc:     Jonathan Neuschäfer <j.neuschaefer@....net>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] mtd: spi-nor: Refactor spi_nor_read_id()

- Don't use `tmp` for two purposes (return value, loop counter).
  Instead, use `i` for the loop counter, and `ret` for the return value.
- Don't use tabs between type and name in variable declarations,
  for consistency with other functions in spi-nor.c.
- Rewrite nested `if`s as `if (a && b)`.
- Remove `info` variable, and use spi_nor_ids[i] directly.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>
---

v2:
- As suggested by Tudor Ambarus:
  - rename tmp to ret
  - remove tabs between variable type and name
  - remove `info` variable

v1:
- https://lore.kernel.org/lkml/20200218151034.24744-1-j.neuschaefer@gmx.net/
---
 drivers/mtd/spi-nor/spi-nor.c | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 4fc632ec18fe..4c01ebb38da8 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -2711,9 +2711,8 @@ static const struct flash_info spi_nor_ids[] = {

 static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
 {
-	int			tmp;
-	u8			*id = nor->bouncebuf;
-	const struct flash_info	*info;
+	int ret, i;
+	u8 *id = nor->bouncebuf;

 	if (nor->spimem) {
 		struct spi_mem_op op =
@@ -2722,22 +2721,20 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
 				   SPI_MEM_OP_NO_DUMMY,
 				   SPI_MEM_OP_DATA_IN(SPI_NOR_MAX_ID_LEN, id, 1));

-		tmp = spi_mem_exec_op(nor->spimem, &op);
+		ret = spi_mem_exec_op(nor->spimem, &op);
 	} else {
-		tmp = nor->controller_ops->read_reg(nor, SPINOR_OP_RDID, id,
+		ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDID, id,
 						    SPI_NOR_MAX_ID_LEN);
 	}
-	if (tmp) {
-		dev_dbg(nor->dev, "error %d reading JEDEC ID\n", tmp);
-		return ERR_PTR(tmp);
+	if (ret) {
+		dev_dbg(nor->dev, "error %d reading JEDEC ID\n", ret);
+		return ERR_PTR(ret);
 	}

-	for (tmp = 0; tmp < ARRAY_SIZE(spi_nor_ids) - 1; tmp++) {
-		info = &spi_nor_ids[tmp];
-		if (info->id_len) {
-			if (!memcmp(info->id, id, info->id_len))
-				return &spi_nor_ids[tmp];
-		}
+	for (i = 0; i < ARRAY_SIZE(spi_nor_ids) - 1; i++) {
+		if (spi_nor_ids[i].id_len &&
+		    !memcmp(spi_nor_ids[i].id, id, spi_nor_ids[i].id_len))
+			return &spi_nor_ids[i];
 	}
 	dev_err(nor->dev, "unrecognized JEDEC id bytes: %*ph\n",
 		SPI_NOR_MAX_ID_LEN, id);
--
2.20.1