[PATCH v15 3/8] mtd: spi-nor: sfdp: Clarify that nor->read_{opcode, dummy} are uninitialized

[tkuw584924 at gmail.com]

From: Tudor Ambarus <tudor.ambarus at microchip.com>

nor->read_{opcode, dummy} are uninitialized (value zero) at SFDP parsing
time. Clarify that in the code.

Signed-off-by: Tudor Ambarus <tudor.ambarus at microchip.com>
Tested-By: Takahiro Kuwano <Takahiro.Kuwano at infineon.com>
---
 drivers/mtd/spi-nor/sfdp.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
index 61ae8c8c5237..058ce218d2af 100644
--- a/drivers/mtd/spi-nor/sfdp.c
+++ b/drivers/mtd/spi-nor/sfdp.c
@@ -178,12 +178,10 @@ static int spi_nor_read_raw(struct spi_nor *nor, u32 addr, size_t len, u8 *buf)
 static int spi_nor_read_sfdp(struct spi_nor *nor, u32 addr,
 			     size_t len, void *buf)
 {
-	u8 addr_nbytes, read_opcode, read_dummy;
+	u8 addr_nbytes;
 	int ret;
 
-	read_opcode = nor->read_opcode;
 	addr_nbytes = nor->addr_nbytes;
-	read_dummy = nor->read_dummy;
 
 	nor->read_opcode = SPINOR_OP_RDSFDP;
 	nor->addr_nbytes = 3;
@@ -191,9 +189,10 @@ static int spi_nor_read_sfdp(struct spi_nor *nor, u32 addr,
 
 	ret = spi_nor_read_raw(nor, addr, len, buf);
 
-	nor->read_opcode = read_opcode;
 	nor->addr_nbytes = addr_nbytes;
-	nor->read_dummy = read_dummy;
+	/* Restore setup to its uninitialized state. */
+	nor->read_opcode = 0;
+	nor->read_dummy = 0;
 
 	return ret;
 }
@@ -690,7 +689,7 @@ static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt,
 	u32 addr;
 	int err;
 	u8 i;
-	u8 addr_nbytes, read_opcode, read_dummy;
+	u8 addr_nbytes;
 	u8 read_data_mask, map_id;
 
 	/* Use a kmalloc'ed bounce buffer to guarantee it is DMA-able. */
@@ -699,8 +698,6 @@ static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt,
 		return ERR_PTR(-ENOMEM);
 
 	addr_nbytes = nor->addr_nbytes;
-	read_dummy = nor->read_dummy;
-	read_opcode = nor->read_opcode;
 
 	map_id = 0;
 	/* Determine if there are any optional Detection Command Descriptors */
@@ -757,8 +754,9 @@ static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt,
 out:
 	kfree(buf);
 	nor->addr_nbytes = addr_nbytes;
-	nor->read_dummy = read_dummy;
-	nor->read_opcode = read_opcode;
+	/* Restore setup to its uninitialized state. */
+	nor->read_dummy = 0;
+	nor->read_opcode = 0;
 	return ret;
 }
 
-- 
2.25.1