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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 21:30:54 +0300
commit1df1fc8c62f7527d953c7f3869930067bf5b3f29 (patch)
treeb683a6e18b43e5a37f47bbbdb2cfb27d54056cde /include/linux/mtd
parentef4ed780d005d65b1a70ba7803233cace93a73ac (diff)
downloadlinux-1df1fc8c62f7527d953c7f3869930067bf5b3f29.tar.xz
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 'include/linux/mtd')
-rw-r--r--include/linux/mtd/mtd.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 4aac200ca8b5..a89955f3cbc8 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -334,7 +334,8 @@ struct mtd_info {
int (*_read_user_prot_reg) (struct mtd_info *mtd, loff_t from,
size_t len, size_t *retlen, u_char *buf);
int (*_write_user_prot_reg) (struct mtd_info *mtd, loff_t to,
- size_t len, size_t *retlen, u_char *buf);
+ size_t len, size_t *retlen,
+ const u_char *buf);
int (*_lock_user_prot_reg) (struct mtd_info *mtd, loff_t from,
size_t len);
int (*_erase_user_prot_reg) (struct mtd_info *mtd, loff_t from,
@@ -518,7 +519,7 @@ int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf);
int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
- size_t *retlen, u_char *buf);
+ size_t *retlen, const u_char *buf);
int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len);
int mtd_erase_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len);