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mtdconfig/nvs: use a fixed size buffer instead of vla

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use a fixed size buffer on stack instead of vla,
When it needs to pass misra-c check

Signed-off-by: zhaoxingyu1 <zhaoxingyu1@xiaomi.com>
This commit is contained in:
zhaoxingyu1
2025-07-15 20:47:25 +08:00
committed by Xiang Xiao
parent 2e4ce22774
commit 1b587db667
2 changed files with 58 additions and 35 deletions
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drivers/mtd/Kconfig
+10 -3
View File
@@ -212,9 +212,16 @@ config MTD_CONFIG_CACHE_SIZE
int "Non-volatile Storage lookup cache size"
default 0
depends on MTD_CONFIG_NVS
help
Number of entries in Non-volatile Storage lookup cache.
It is recommended that it be a power of 2.
---help---
Number of entries in Non-volatile Storage lookup cache.
It is recommended that it be a power of 2.
config MTD_CONFIG_BUFFER_SIZE
int "Buffer size on the stack"
default 0
---help---
Define a fixed size buffer on the stack instead of using a
variable length array.
endif
drivers/mtd/mtd_config_nvs.c
+48 -32
View File
@@ -57,9 +57,17 @@
#define NVS_CACHE_NO_ADDR 0xffffffff
#define NVS_ATE(name, size) \
char name##_buf[size]; \
FAR struct nvs_ate *name = (FAR struct nvs_ate *)name##_buf
#if CONFIG_MTD_CONFIG_BUFFER_SIZE > 0
# define NVS_BUFFER_SIZE(fs) CONFIG_MTD_CONFIG_BUFFER_SIZE
# define NVS_ATE(name, size) \
char name##_buf[CONFIG_MTD_CONFIG_BUFFER_SIZE]; \
FAR struct nvs_ate *name = (FAR struct nvs_ate *)name##_buf
#else
# define NVS_BUFFER_SIZE(fs) nvs_align_up(fs, 32)
# define NVS_ATE(name, size) \
char name##_buf[size]; \
FAR struct nvs_ate *name = (FAR struct nvs_ate *)name##_buf
#endif
/****************************************************************************
* Private Types
@@ -204,6 +212,15 @@ static inline size_t nvs_align_up(FAR struct nvs_fs *fs, size_t len)
return (len + (fs->progsize - 1)) & ~(fs->progsize - 1);
}
/****************************************************************************
* Name: nvs_align_down
****************************************************************************/
static inline size_t nvs_align_down(FAR struct nvs_fs *fs, size_t len)
{
return len & ~(fs->progsize - 1);
}
/****************************************************************************
* Name: nvs_ate_size
****************************************************************************/
@@ -220,15 +237,6 @@ static inline size_t nvs_ate_size(FAR struct nvs_fs *fs)
return nvs_align_up(fs, sizeof(struct nvs_ate)) + fs->progsize;
}
/****************************************************************************
* Name: nvs_buffer_size
****************************************************************************/
static inline size_t nvs_buffer_size(FAR struct nvs_fs *fs)
{
return nvs_align_up(fs, 32);
}
/****************************************************************************
* Name: nvs_ate_expired
****************************************************************************/
@@ -340,7 +348,7 @@ static int nvs_flash_rd(FAR struct nvs_fs *fs, uint32_t addr,
return nvs_flash_brd(fs, offset, data, len);
#else
uint8_t buf[fs->progsize];
uint8_t buf[NVS_BUFFER_SIZE(fs)];
size_t bytes_to_rd;
off_t begin_padding;
off_t offset;
@@ -466,13 +474,14 @@ static int nvs_flash_block_cmp(FAR struct nvs_fs *fs, uint32_t addr,
FAR const void *data, size_t len)
{
FAR const uint8_t *data8 = (FAR const uint8_t *)data;
uint8_t buf[nvs_buffer_size(fs)];
uint8_t buf[NVS_BUFFER_SIZE(fs)];
size_t buf_size = nvs_align_down(fs, sizeof(buf));
size_t bytes_to_cmp;
int rc;
while (len > 0)
{
bytes_to_cmp = MIN(sizeof(buf), len);
bytes_to_cmp = MIN(buf_size, len);
rc = nvs_flash_rd(fs, addr, buf, bytes_to_cmp);
if (rc)
{
@@ -506,14 +515,15 @@ static int nvs_flash_block_cmp(FAR struct nvs_fs *fs, uint32_t addr,
static int nvs_flash_direct_cmp(FAR struct nvs_fs *fs, uint32_t addr1,
uint32_t addr2, size_t len)
{
uint8_t buf1[nvs_buffer_size(fs)];
uint8_t buf2[nvs_buffer_size(fs)];
uint8_t buf1[NVS_BUFFER_SIZE(fs)];
uint8_t buf2[NVS_BUFFER_SIZE(fs)];
size_t buf_size = nvs_align_down(fs, sizeof(buf1));
size_t bytes_to_cmp;
int rc;
while (len > 0)
{
bytes_to_cmp = MIN(sizeof(buf1), len);
bytes_to_cmp = MIN(buf_size, len);
rc = nvs_flash_rd(fs, addr1, buf1, bytes_to_cmp);
if (rc)
{
@@ -553,14 +563,15 @@ static int nvs_flash_direct_cmp(FAR struct nvs_fs *fs, uint32_t addr1,
static int nvs_flash_cmp_const(FAR struct nvs_fs *fs, uint32_t addr,
uint8_t value, size_t len)
{
uint8_t cmp[nvs_buffer_size(fs)];
uint8_t cmp[NVS_BUFFER_SIZE(fs)];
size_t buf_size = nvs_align_down(fs, sizeof(cmp));
size_t bytes_to_cmp;
int rc;
memset(cmp, value, sizeof(cmp));
while (len > 0)
{
bytes_to_cmp = MIN(sizeof(cmp), len);
bytes_to_cmp = MIN(buf_size, len);
rc = nvs_flash_block_cmp(fs, addr, cmp, bytes_to_cmp);
if (rc)
{
@@ -586,13 +597,14 @@ static int nvs_flash_cmp_const(FAR struct nvs_fs *fs, uint32_t addr,
static int nvs_flash_block_move(FAR struct nvs_fs *fs, uint32_t addr,
size_t len)
{
uint8_t buf[nvs_buffer_size(fs)];
uint8_t buf[NVS_BUFFER_SIZE(fs)];
size_t buf_size = nvs_align_down(fs, sizeof(buf));
size_t bytes_to_copy;
int rc;
while (len)
{
bytes_to_copy = MIN(sizeof(buf), len);
bytes_to_copy = MIN(buf_size, len);
rc = nvs_flash_rd(fs, addr, buf, bytes_to_copy);
if (rc)
{
@@ -799,7 +811,7 @@ static int nvs_flash_wrt_entry(FAR struct nvs_fs *fs, uint32_t id,
{
size_t ate_size = nvs_ate_size(fs);
NVS_ATE(entry, ate_size);
uint8_t buf[fs->progsize];
uint8_t buf[NVS_BUFFER_SIZE(fs)];
uint16_t copy_len = 0;
uint16_t left;
int rc;
@@ -826,14 +838,14 @@ static int nvs_flash_wrt_entry(FAR struct nvs_fs *fs, uint32_t id,
/* Write align block which include part key + part data */
left = rc;
memset(buf, fs->erasestate, sizeof(buf));
memset(buf, fs->erasestate, fs->progsize);
copy_len = (left + len) <= sizeof(buf) ?
len : (sizeof(buf) - left);
copy_len = (left + len) <= fs->progsize ?
len : (fs->progsize - left);
memcpy(buf, key + key_size - left, left);
memcpy(buf + left, data, copy_len);
rc = nvs_flash_data_wrt(fs, buf, sizeof(buf));
rc = nvs_flash_data_wrt(fs, buf, fs->progsize);
if (rc)
{
ferr("Write value failed, rc=%d\n", rc);
@@ -852,10 +864,10 @@ static int nvs_flash_wrt_entry(FAR struct nvs_fs *fs, uint32_t id,
/* Add padding at the end of data */
left = rc;
memset(buf, fs->erasestate, sizeof(buf));
memset(buf, fs->erasestate, fs->progsize);
memcpy(buf, data + len - left, left);
rc = nvs_flash_data_wrt(fs, buf, sizeof(buf));
rc = nvs_flash_data_wrt(fs, buf, fs->progsize);
if (rc)
{
ferr("Write value failed, rc=%d\n", rc);
@@ -1088,11 +1100,11 @@ static int nvs_add_gc_done_ate(FAR struct nvs_fs *fs)
static int nvs_expire_ate(FAR struct nvs_fs *fs, uint32_t addr)
{
uint8_t expired[fs->progsize];
memset(expired, ~fs->erasestate, sizeof(expired));
uint8_t expired[NVS_BUFFER_SIZE(fs)];
memset(expired, ~fs->erasestate, fs->progsize);
return nvs_flash_wrt(fs, addr + nvs_align_up(fs, sizeof(struct nvs_ate)),
expired, sizeof(expired));
expired, fs->progsize);
}
/****************************************************************************
@@ -1274,6 +1286,10 @@ static int nvs_startup(FAR struct nvs_fs *fs)
NVS_ATE(second_ate, ate_size);
NVS_ATE(last_ate, ate_size);
#if CONFIG_MTD_CONFIG_BUFFER_SIZE > 0
DEBUGASSERT(ate_size <= CONFIG_MTD_CONFIG_BUFFER_SIZE);
#endif
rc = MTD_IOCTL(fs->mtd, MTDIOC_ERASESTATE,
(unsigned long)((uintptr_t)&fs->erasestate));
if (rc < 0)