linux-kernel - [PATCH 3/3] mtd: spi-nor: Introduce spi_nor_get_flash

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Date:   Wed, 31 Jul 2019 09:18:49 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <boris.brezillon@...labora.com>, <marek.vasut@...il.com>,
        <vigneshr@...com>
CC:     <dwmw2@...radead.org>, <computersforpeace@...il.com>,
        <miquel.raynal@...tlin.com>, <richard@....at>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <Tudor.Ambarus@...rochip.com>
Subject: [PATCH 3/3] mtd: spi-nor: Introduce spi_nor_get_flash_info()

From: Tudor Ambarus <tudor.ambarus@...rochip.com>

Dedicate a function for getting the pointer to the flash_info
const struct. Trim a bit the spi_nor_scan() huge function.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 52 ++++++++++++++++++++++++++-----------------
 1 file changed, 32 insertions(+), 20 deletions(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index c322d7cd8216..636f065cc869 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -4800,25 +4800,10 @@ static int spi_nor_set_addr_width(struct spi_nor *nor)
 	return 0;
 }
 
-int spi_nor_scan(struct spi_nor *nor, const char *name,
-		 const struct spi_nor_hwcaps *hwcaps)
+static const struct flash_info *spi_nor_get_flash_info(struct spi_nor *nor,
+						       const char *name)
 {
-	struct spi_nor_flash_parameter params;
 	const struct flash_info *info = NULL;
-	struct device *dev = nor->dev;
-	struct mtd_info *mtd = &nor->mtd;
-	struct device_node *np = spi_nor_get_flash_node(nor);
-	int ret;
-	int i;
-
-	ret = spi_nor_check(nor);
-	if (ret)
-		return ret;
-
-	/* Reset SPI protocol for all commands. */
-	nor->reg_proto = SNOR_PROTO_1_1_1;
-	nor->read_proto = SNOR_PROTO_1_1_1;
-	nor->write_proto = SNOR_PROTO_1_1_1;
 
 	if (name)
 		info = spi_nor_match_id(name);
@@ -4826,7 +4811,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	if (!info)
 		info = spi_nor_read_id(nor);
 	if (IS_ERR_OR_NULL(info))
-		return -ENOENT;
+		return ERR_PTR(-ENOENT);
 
 	/*
 	 * If caller has specified name of flash model that can normally be
@@ -4837,7 +4822,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 
 		jinfo = spi_nor_read_id(nor);
 		if (IS_ERR(jinfo)) {
-			return PTR_ERR(jinfo);
+			return jinfo;
 		} else if (jinfo != info) {
 			/*
 			 * JEDEC knows better, so overwrite platform ID. We
@@ -4846,12 +4831,39 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 			 * marked read-only, and we don't want to lose that
 			 * information, even if it's not 100% accurate.
 			 */
-			dev_warn(dev, "found %s, expected %s\n",
+			dev_warn(nor->dev, "found %s, expected %s\n",
 				 jinfo->name, info->name);
 			info = jinfo;
 		}
 	}
 
+	return info;
+}
+
+int spi_nor_scan(struct spi_nor *nor, const char *name,
+		 const struct spi_nor_hwcaps *hwcaps)
+{
+	struct spi_nor_flash_parameter params;
+	const struct flash_info *info;
+	struct device *dev = nor->dev;
+	struct mtd_info *mtd = &nor->mtd;
+	struct device_node *np = spi_nor_get_flash_node(nor);
+	int ret;
+	int i;
+
+	ret = spi_nor_check(nor);
+	if (ret)
+		return ret;
+
+	/* Reset SPI protocol for all commands. */
+	nor->reg_proto = SNOR_PROTO_1_1_1;
+	nor->read_proto = SNOR_PROTO_1_1_1;
+	nor->write_proto = SNOR_PROTO_1_1_1;
+
+	info = spi_nor_get_flash_info(nor, name);
+	if (IS_ERR(info))
+		return PTR_ERR(info);
+
 	nor->info = info;
 
 	mutex_init(&nor->lock);
-- 
2.9.5