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authorTudor Ambarus <tudor.ambarus@microchip.com>2021-04-03 09:09:31 +0300
committerMiquel Raynal <miquel.raynal@bootlin.com>2021-04-16 20:30:54 +0200
commit1df1fc8c62f7527d953c7f3869930067bf5b3f29 (patch)
treeb683a6e18b43e5a37f47bbbdb2cfb27d54056cde /drivers/mtd/spi-nor
parentef4ed780d005d65b1a70ba7803233cace93a73ac (diff)
mtd: core: Constify buf in mtd_write_user_prot_reg()
The write buffer comes from user and should be const. Constify write buffer in mtd core and across all _write_user_prot_reg() users. cfi_cmdset_{0001, 0002} and onenand_base will pay the cost of an explicit cast to discard the const qualifier since the beginning, since they are using an otp_op_t function prototype that is used for both reads and writes. mtd_dataflash and SPI NOR will benefit of the const buffer because they are using different paths for writes and reads. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20210403060931.7119-1-tudor.ambarus@microchip.com
Diffstat (limited to 'drivers/mtd/spi-nor')
-rw-r--r--drivers/mtd/spi-nor/core.h6
-rw-r--r--drivers/mtd/spi-nor/otp.c9
2 files changed, 9 insertions, 6 deletions
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index e9b6b2e76cdb..28a2e0be97a3 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -211,7 +211,8 @@ struct spi_nor_otp_organization {
*/
struct spi_nor_otp_ops {
int (*read)(struct spi_nor *nor, loff_t addr, size_t len, u8 *buf);
- int (*write)(struct spi_nor *nor, loff_t addr, size_t len, u8 *buf);
+ int (*write)(struct spi_nor *nor, loff_t addr, size_t len,
+ const u8 *buf);
int (*lock)(struct spi_nor *nor, unsigned int region);
int (*is_locked)(struct spi_nor *nor, unsigned int region);
};
@@ -504,7 +505,8 @@ ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len,
const u8 *buf);
int spi_nor_otp_read_secr(struct spi_nor *nor, loff_t addr, size_t len, u8 *buf);
-int spi_nor_otp_write_secr(struct spi_nor *nor, loff_t addr, size_t len, u8 *buf);
+int spi_nor_otp_write_secr(struct spi_nor *nor, loff_t addr, size_t len,
+ const u8 *buf);
int spi_nor_otp_lock_sr2(struct spi_nor *nor, unsigned int region);
int spi_nor_otp_is_locked_sr2(struct spi_nor *nor, unsigned int region);
diff --git a/drivers/mtd/spi-nor/otp.c b/drivers/mtd/spi-nor/otp.c
index 5021d40dffbf..fcf38d260345 100644
--- a/drivers/mtd/spi-nor/otp.c
+++ b/drivers/mtd/spi-nor/otp.c
@@ -70,7 +70,8 @@ int spi_nor_otp_read_secr(struct spi_nor *nor, loff_t addr, size_t len, u8 *buf)
*
* Return: number of bytes written successfully, -errno otherwise
*/
-int spi_nor_otp_write_secr(struct spi_nor *nor, loff_t addr, size_t len, u8 *buf)
+int spi_nor_otp_write_secr(struct spi_nor *nor, loff_t addr, size_t len,
+ const u8 *buf)
{
enum spi_nor_protocol write_proto;
struct spi_mem_dirmap_desc *wdesc;
@@ -241,7 +242,7 @@ out:
static int spi_nor_mtd_otp_read_write(struct mtd_info *mtd, loff_t ofs,
size_t total_len, size_t *retlen,
- u8 *buf, bool is_write)
+ const u8 *buf, bool is_write)
{
struct spi_nor *nor = mtd_to_spi_nor(mtd);
const struct spi_nor_otp_ops *ops = nor->params->otp.ops;
@@ -285,7 +286,7 @@ static int spi_nor_mtd_otp_read_write(struct mtd_info *mtd, loff_t ofs,
if (is_write)
ret = ops->write(nor, rstart + rofs, len, buf);
else
- ret = ops->read(nor, rstart + rofs, len, buf);
+ ret = ops->read(nor, rstart + rofs, len, (u8 *)buf);
if (ret == 0)
ret = -EIO;
if (ret < 0)
@@ -310,7 +311,7 @@ static int spi_nor_mtd_otp_read(struct mtd_info *mtd, loff_t from, size_t len,
}
static int spi_nor_mtd_otp_write(struct mtd_info *mtd, loff_t to, size_t len,
- size_t *retlen, u8 *buf)
+ size_t *retlen, const u8 *buf)
{
return spi_nor_mtd_otp_read_write(mtd, to, len, retlen, buf, true);
}