[PATCH v3 1/6] mtd: spi-nor: core: Report correct name in case of ID collisions

[Tudor Ambarus]

Provide a way to report the correct flash name in case of ID collisions.
There will be a single flash_info entry when flash IDs collide, and the
differentiation between the flash types will be made at runtime
if possible.

Signed-off-by: Tudor Ambarus <tudor.ambarus at microchip.com>
---
 drivers/mtd/spi-nor/core.c  | 7 +++++--
 drivers/mtd/spi-nor/sysfs.c | 2 +-
 include/linux/mtd/spi-nor.h | 2 ++
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index ea26f27a3229..3d97c189c332 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -3132,7 +3132,7 @@ static void spi_nor_debugfs_init(struct spi_nor *nor,
 {
 	struct mtd_info *mtd = &nor->mtd;
 
-	mtd->dbg.partname = info->name;
+	mtd->dbg.partname = nor->name;
 	mtd->dbg.partid = devm_kasprintf(nor->dev, GFP_KERNEL, "spi-nor:%*phN",
 					 info->id_len, info->id);
 }
@@ -3271,7 +3271,10 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 
 	spi_nor_set_mtd_info(nor);
 
-	dev_info(dev, "%s (%lld Kbytes)\n", info->name,
+	if (!nor->name)
+		nor->name = info->name;
+
+	dev_info(dev, "%s (%lld Kbytes)\n", nor->name,
 			(long long)mtd->size >> 10);
 
 	dev_dbg(dev,
diff --git a/drivers/mtd/spi-nor/sysfs.c b/drivers/mtd/spi-nor/sysfs.c
index 9aec9d8a98ad..017119768f32 100644
--- a/drivers/mtd/spi-nor/sysfs.c
+++ b/drivers/mtd/spi-nor/sysfs.c
@@ -25,7 +25,7 @@ static ssize_t partname_show(struct device *dev,
 	struct spi_mem *spimem = spi_get_drvdata(spi);
 	struct spi_nor *nor = spi_mem_get_drvdata(spimem);
 
-	return sysfs_emit(buf, "%s\n", nor->info->name);
+	return sysfs_emit(buf, "%s\n", nor->name);
 }
 static DEVICE_ATTR_RO(partname);
 
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index fc90fce26e33..be7ebaf092fe 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -369,6 +369,7 @@ struct spi_nor_flash_parameter;
  * @bouncebuf:		bounce buffer used when the buffer passed by the MTD
  *                      layer is not DMA-able
  * @bouncebuf_size:	size of the bounce buffer
+ * @name:		used to point to correct name in case of ID collisions.
  * @info:		SPI NOR part JEDEC MFR ID and other info
  * @manufacturer:	SPI NOR manufacturer
  * @addr_width:		number of address bytes
@@ -398,6 +399,7 @@ struct spi_nor {
 	struct spi_mem		*spimem;
 	u8			*bouncebuf;
 	size_t			bouncebuf_size;
+	const char *name;
 	const struct flash_info	*info;
 	const struct spi_nor_manufacturer *manufacturer;
 	u8			addr_width;
-- 
2.25.1