linux-kernel - [PATCH v2 5/6] mtd: spi-nor: simplify spi_nor_get_flash

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Date: Fri, 19 Apr 2024 16:12:48 +0200
From: Michael Walle <mwalle@...nel.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>,
	Pratyush Yadav <pratyush@...nel.org>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>
Cc: Ricardo Ribalda <ribalda@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org,
	Michael Walle <mwalle@...nel.org>
Subject: [PATCH v2 5/6] mtd: spi-nor: simplify spi_nor_get_flash_info()

Rework spi_nor_get_flash_info() to make it look more straight forward
and esp. don't return early. The latter is a preparation to check for
deprecated flashes.

Signed-off-by: Michael Walle <mwalle@...nel.org>
Reviewed-by: Pratyush Yadav <pratyush@...nel.org>
---
 drivers/mtd/spi-nor/core.c | 45 ++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 24 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 4e2ae6642d4c..8e4ae1317870 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -3294,39 +3294,36 @@ static const struct flash_info *spi_nor_match_name(struct spi_nor *nor,
 static const struct flash_info *spi_nor_get_flash_info(struct spi_nor *nor,
 						       const char *name)
 {
-	const struct flash_info *info = NULL;
+	const struct flash_info *jinfo = NULL, *info = NULL;
 
 	if (name)
 		info = spi_nor_match_name(nor, name);
-	/* Try to auto-detect if chip name wasn't specified or not found */
-	if (!info)
-		return spi_nor_detect(nor);
-
 	/*
-	 * If caller has specified name of flash model that can normally be
-	 * detected using JEDEC, let's verify it.
+	 * Auto-detect if chip name wasn't specified or not found, or the chip
+	 * has an ID. If the chip supposedly has an ID, we also do an
+	 * auto-detection to compare it later.
 	 */
-	if (name && info->id) {
-		const struct flash_info *jinfo;
-
+	if (!info || info->id) {
 		jinfo = spi_nor_detect(nor);
-		if (IS_ERR(jinfo)) {
+		if (IS_ERR(jinfo))
 			return jinfo;
-		} else if (jinfo != info) {
-			/*
-			 * JEDEC knows better, so overwrite platform ID. We
-			 * can't trust partitions any longer, but we'll let
-			 * mtd apply them anyway, since some partitions may be
-			 * marked read-only, and we don't want to loose that
-			 * information, even if it's not 100% accurate.
-			 */
-			dev_warn(nor->dev, "found %s, expected %s\n",
-				 jinfo->name, info->name);
-			info = jinfo;
-		}
 	}
 
-	return info;
+	/*
+	 * If caller has specified name of flash model that can normally be
+	 * detected using JEDEC, let's verify it.
+	 */
+	if (info && jinfo && jinfo != info)
+		dev_warn(nor->dev, "found %s, expected %s\n",
+			 jinfo->name, info->name);
+
+	/*
+	 * JEDEC knows better, so overwrite platform ID. We can't trust
+	 * partitions any longer, but we'll let mtd apply them anyway, since
+	 * some partitions may be marked read-only, and we don't want to loose
+	 * that information, even if it's not 100% accurate.
+	 */
+	return jinfo ?: info;
 }
 
 static u32
-- 
2.39.2