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Message-ID: <72597e9de2320a4109be2112e696399592edacd4.1729271136.git.christophe.jaillet@wanadoo.fr>
Date: Fri, 18 Oct 2024 19:05:57 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Miquel Raynal <miquel.raynal@...tlin.com>,
Richard Weinberger <richard@....at>,
Vignesh Raghavendra <vigneshr@...com>,
Mark Brown <broonie@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: linux-kernel@...r.kernel.org,
kernel-janitors@...r.kernel.org,
Christophe JAILLET <christophe.jaillet@...adoo.fr>,
linux-mtd@...ts.infradead.org,
linux-spi@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: [PATCH] mtd: spinand: Constify struct nand_ecc_engine_ops
'struct nand_ecc_engine_ops' are not modified in these drivers.
Constifying this structure moves some data to a read-only section, so
increases overall security, especially when the structure holds some
function pointers.
Update the prototype of mxic_ecc_get_pipelined_ops() accordingly.
On a x86_64, with allmodconfig, as an example:
Before:
======
text data bss dec hex filename
16709 1374 16 18099 46b3 drivers/mtd/nand/ecc-mxic.o
After:
=====
text data bss dec hex filename
16789 1294 16 18099 46b3 drivers/mtd/nand/ecc-mxic.o
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Compile tested only.
---
drivers/mtd/nand/ecc-mxic.c | 6 +++---
drivers/mtd/nand/ecc-sw-bch.c | 2 +-
drivers/mtd/nand/ecc-sw-hamming.c | 2 +-
drivers/mtd/nand/spi/core.c | 2 +-
drivers/spi/spi-mtk-snfi.c | 2 +-
drivers/spi/spi-mxic.c | 10 +++++-----
include/linux/mtd/nand-ecc-mxic.h | 4 ++--
include/linux/mtd/nand.h | 2 +-
8 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/drivers/mtd/nand/ecc-mxic.c b/drivers/mtd/nand/ecc-mxic.c
index 47e10945b8d2..86895e09328f 100644
--- a/drivers/mtd/nand/ecc-mxic.c
+++ b/drivers/mtd/nand/ecc-mxic.c
@@ -723,21 +723,21 @@ static int mxic_ecc_finish_io_req_pipelined(struct nand_device *nand,
return ret;
}
-static struct nand_ecc_engine_ops mxic_ecc_engine_external_ops = {
+static const struct nand_ecc_engine_ops mxic_ecc_engine_external_ops = {
.init_ctx = mxic_ecc_init_ctx_external,
.cleanup_ctx = mxic_ecc_cleanup_ctx,
.prepare_io_req = mxic_ecc_prepare_io_req_external,
.finish_io_req = mxic_ecc_finish_io_req_external,
};
-static struct nand_ecc_engine_ops mxic_ecc_engine_pipelined_ops = {
+static const struct nand_ecc_engine_ops mxic_ecc_engine_pipelined_ops = {
.init_ctx = mxic_ecc_init_ctx_pipelined,
.cleanup_ctx = mxic_ecc_cleanup_ctx,
.prepare_io_req = mxic_ecc_prepare_io_req_pipelined,
.finish_io_req = mxic_ecc_finish_io_req_pipelined,
};
-struct nand_ecc_engine_ops *mxic_ecc_get_pipelined_ops(void)
+const struct nand_ecc_engine_ops *mxic_ecc_get_pipelined_ops(void)
{
return &mxic_ecc_engine_pipelined_ops;
}
diff --git a/drivers/mtd/nand/ecc-sw-bch.c b/drivers/mtd/nand/ecc-sw-bch.c
index 405552d014a8..0d9310dd6f52 100644
--- a/drivers/mtd/nand/ecc-sw-bch.c
+++ b/drivers/mtd/nand/ecc-sw-bch.c
@@ -384,7 +384,7 @@ static int nand_ecc_sw_bch_finish_io_req(struct nand_device *nand,
return max_bitflips;
}
-static struct nand_ecc_engine_ops nand_ecc_sw_bch_engine_ops = {
+static const struct nand_ecc_engine_ops nand_ecc_sw_bch_engine_ops = {
.init_ctx = nand_ecc_sw_bch_init_ctx,
.cleanup_ctx = nand_ecc_sw_bch_cleanup_ctx,
.prepare_io_req = nand_ecc_sw_bch_prepare_io_req,
diff --git a/drivers/mtd/nand/ecc-sw-hamming.c b/drivers/mtd/nand/ecc-sw-hamming.c
index 254db2e7f8bb..f2d0effad9d2 100644
--- a/drivers/mtd/nand/ecc-sw-hamming.c
+++ b/drivers/mtd/nand/ecc-sw-hamming.c
@@ -638,7 +638,7 @@ static int nand_ecc_sw_hamming_finish_io_req(struct nand_device *nand,
return max_bitflips;
}
-static struct nand_ecc_engine_ops nand_ecc_sw_hamming_engine_ops = {
+static const struct nand_ecc_engine_ops nand_ecc_sw_hamming_engine_ops = {
.init_ctx = nand_ecc_sw_hamming_init_ctx,
.cleanup_ctx = nand_ecc_sw_hamming_cleanup_ctx,
.prepare_io_req = nand_ecc_sw_hamming_prepare_io_req,
diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index 4d76f9f71a0e..b1df7f627161 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -337,7 +337,7 @@ static int spinand_ondie_ecc_finish_io_req(struct nand_device *nand,
return ret;
}
-static struct nand_ecc_engine_ops spinand_ondie_ecc_engine_ops = {
+static const struct nand_ecc_engine_ops spinand_ondie_ecc_engine_ops = {
.init_ctx = spinand_ondie_ecc_init_ctx,
.cleanup_ctx = spinand_ondie_ecc_cleanup_ctx,
.prepare_io_req = spinand_ondie_ecc_prepare_io_req,
diff --git a/drivers/spi/spi-mtk-snfi.c b/drivers/spi/spi-mtk-snfi.c
index debe0e3c1c8b..4169d622f28c 100644
--- a/drivers/spi/spi-mtk-snfi.c
+++ b/drivers/spi/spi-mtk-snfi.c
@@ -776,7 +776,7 @@ static int mtk_snand_ecc_finish_io_req(struct nand_device *nand,
return snf->ecc_stats.failed ? -EBADMSG : snf->ecc_stats.bitflips;
}
-static struct nand_ecc_engine_ops mtk_snfi_ecc_engine_ops = {
+static const struct nand_ecc_engine_ops mtk_snfi_ecc_engine_ops = {
.init_ctx = mtk_snand_ecc_init_ctx,
.cleanup_ctx = mtk_snand_ecc_cleanup_ctx,
.prepare_io_req = mtk_snand_ecc_prepare_io_req,
diff --git a/drivers/spi/spi-mxic.c b/drivers/spi/spi-mxic.c
index 9699e0bb6a5e..809767d3145c 100644
--- a/drivers/spi/spi-mxic.c
+++ b/drivers/spi/spi-mxic.c
@@ -649,7 +649,7 @@ static int mxic_spi_transfer_one(struct spi_controller *host,
/* ECC wrapper */
static int mxic_spi_mem_ecc_init_ctx(struct nand_device *nand)
{
- struct nand_ecc_engine_ops *ops = mxic_ecc_get_pipelined_ops();
+ const struct nand_ecc_engine_ops *ops = mxic_ecc_get_pipelined_ops();
struct mxic_spi *mxic = nand->ecc.engine->priv;
mxic->ecc.use_pipelined_conf = true;
@@ -659,7 +659,7 @@ static int mxic_spi_mem_ecc_init_ctx(struct nand_device *nand)
static void mxic_spi_mem_ecc_cleanup_ctx(struct nand_device *nand)
{
- struct nand_ecc_engine_ops *ops = mxic_ecc_get_pipelined_ops();
+ const struct nand_ecc_engine_ops *ops = mxic_ecc_get_pipelined_ops();
struct mxic_spi *mxic = nand->ecc.engine->priv;
mxic->ecc.use_pipelined_conf = false;
@@ -670,7 +670,7 @@ static void mxic_spi_mem_ecc_cleanup_ctx(struct nand_device *nand)
static int mxic_spi_mem_ecc_prepare_io_req(struct nand_device *nand,
struct nand_page_io_req *req)
{
- struct nand_ecc_engine_ops *ops = mxic_ecc_get_pipelined_ops();
+ const struct nand_ecc_engine_ops *ops = mxic_ecc_get_pipelined_ops();
return ops->prepare_io_req(nand, req);
}
@@ -678,12 +678,12 @@ static int mxic_spi_mem_ecc_prepare_io_req(struct nand_device *nand,
static int mxic_spi_mem_ecc_finish_io_req(struct nand_device *nand,
struct nand_page_io_req *req)
{
- struct nand_ecc_engine_ops *ops = mxic_ecc_get_pipelined_ops();
+ const struct nand_ecc_engine_ops *ops = mxic_ecc_get_pipelined_ops();
return ops->finish_io_req(nand, req);
}
-static struct nand_ecc_engine_ops mxic_spi_mem_ecc_engine_pipelined_ops = {
+static const struct nand_ecc_engine_ops mxic_spi_mem_ecc_engine_pipelined_ops = {
.init_ctx = mxic_spi_mem_ecc_init_ctx,
.cleanup_ctx = mxic_spi_mem_ecc_cleanup_ctx,
.prepare_io_req = mxic_spi_mem_ecc_prepare_io_req,
diff --git a/include/linux/mtd/nand-ecc-mxic.h b/include/linux/mtd/nand-ecc-mxic.h
index b125926e458c..0da4b2999576 100644
--- a/include/linux/mtd/nand-ecc-mxic.h
+++ b/include/linux/mtd/nand-ecc-mxic.h
@@ -16,7 +16,7 @@ struct mxic_ecc_engine;
#if IS_ENABLED(CONFIG_MTD_NAND_ECC_MXIC) && IS_REACHABLE(CONFIG_MTD_NAND_CORE)
-struct nand_ecc_engine_ops *mxic_ecc_get_pipelined_ops(void);
+const struct nand_ecc_engine_ops *mxic_ecc_get_pipelined_ops(void);
struct nand_ecc_engine *mxic_ecc_get_pipelined_engine(struct platform_device *spi_pdev);
void mxic_ecc_put_pipelined_engine(struct nand_ecc_engine *eng);
int mxic_ecc_process_data_pipelined(struct nand_ecc_engine *eng,
@@ -24,7 +24,7 @@ int mxic_ecc_process_data_pipelined(struct nand_ecc_engine *eng,
#else /* !CONFIG_MTD_NAND_ECC_MXIC */
-static inline struct nand_ecc_engine_ops *mxic_ecc_get_pipelined_ops(void)
+static inline const struct nand_ecc_engine_ops *mxic_ecc_get_pipelined_ops(void)
{
return NULL;
}
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 1e4208040956..0e2f228e8b4a 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -293,7 +293,7 @@ enum nand_ecc_engine_integration {
struct nand_ecc_engine {
struct device *dev;
struct list_head node;
- struct nand_ecc_engine_ops *ops;
+ const struct nand_ecc_engine_ops *ops;
enum nand_ecc_engine_integration integration;
void *priv;
};
--
2.47.0
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