linux-kernel - [PATCH v6 3/7] mtd: spi-nor: core: Use auto-detection only once

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Date:   Wed, 9 Feb 2022 15:36:52 +0200
From:   Tudor Ambarus <tudor.ambarus@...rochip.com>
To:     <p.yadav@...com>, <michael@...le.cc>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <nicolas.ferre@...rochip.com>, <zhengxunli@...c.com.tw>,
        <jaimeliao@...c.com.tw>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>
Subject: [PATCH v6 3/7] mtd: spi-nor: core: Use auto-detection only once

In case spi_nor_match_name() returned NULL, the auto detection was
issued twice. There's no reason to try to detect the same chip twice,
do the auto detection only once.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/mtd/spi-nor/core.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 335170fc2438..9b740f77174e 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -3127,13 +3127,15 @@ 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 *info = NULL, *detected_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)
-		info = spi_nor_read_id(nor);
+	if (!info) {
+		detected_info = spi_nor_read_id(nor);
+		info = detected_info;
+	}
 	if (IS_ERR_OR_NULL(info))
 		return ERR_PTR(-ENOENT);
 
@@ -3141,7 +3143,7 @@ static const struct flash_info *spi_nor_get_flash_info(struct spi_nor *nor,
 	 * If caller has specified name of flash model that can normally be
 	 * detected using JEDEC, let's verify it.
 	 */
-	if (name && info->id_len) {
+	if (name && !detected_info && info->id_len) {
 		const struct flash_info *jinfo;
 
 		jinfo = spi_nor_read_id(nor);
-- 
2.25.1