From: Rafał Miłecki rafal@milecki.pl
Environment variables can be stored in two formats: 1. Single entry with header containing CRC32 2. Two entries with extra flags field in each entry header
For that reason fw_env_open() has two main code paths and there are pointers for CRC32/flags/data.
Previous implementation was a bit hard to follow: 1. It was checking for used format twice (in reversed order each time) 2. It was setting "environment" global struct fields to some temporary values that required extra comments explaining it
This change simplifies that code: 1. It introduces two clear code paths 2. It sets "environment" global struct fields values only once it really knows them
To be fair there are *two* crc32() calls now and an extra pointer variable but that should be cheap enough and worth it.
Signed-off-by: Rafał Miłecki rafal@milecki.pl --- V2: Add missing "environment.image = addr0;" --- tools/env/fw_env.c | 77 +++++++++++++++++++--------------------------- 1 file changed, 31 insertions(+), 46 deletions(-)
diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c index a738b910c2..31afef6f3b 100644 --- a/tools/env/fw_env.c +++ b/tools/env/fw_env.c @@ -1421,9 +1421,6 @@ int fw_env_open(struct env_opts *opts)
int ret;
- struct env_image_single *single; - struct env_image_redundant *redundant; - if (!opts) opts = &default_opts;
@@ -1439,40 +1436,37 @@ int fw_env_open(struct env_opts *opts) goto open_cleanup; }
- /* read environment from FLASH to local buffer */ - environment.image = addr0; - - if (have_redund_env) { - redundant = addr0; - environment.crc = &redundant->crc; - environment.flags = &redundant->flags; - environment.data = redundant->data; - } else { - single = addr0; - environment.crc = &single->crc; - environment.flags = NULL; - environment.data = single->data; - } - dev_current = 0; - if (flash_io(O_RDONLY, environment.image, CUR_ENVSIZE)) { + if (flash_io(O_RDONLY, addr0, CUR_ENVSIZE)) { ret = -EIO; goto open_cleanup; }
- crc0 = crc32(0, (uint8_t *)environment.data, ENV_SIZE); - - crc0_ok = (crc0 == *environment.crc); if (!have_redund_env) { + struct env_image_single *single = addr0; + + crc0 = crc32(0, (uint8_t *)single->data, ENV_SIZE); + crc0_ok = (crc0 == single->crc); if (!crc0_ok) { fprintf(stderr, "Warning: Bad CRC, using default environment\n"); - memcpy(environment.data, default_environment, + memcpy(single->data, default_environment, sizeof(default_environment)); environment.dirty = 1; } + + environment.image = addr0; + environment.crc = &single->crc; + environment.flags = NULL; + environment.data = single->data; } else { - flag0 = *environment.flags; + struct env_image_redundant *redundant0 = addr0; + struct env_image_redundant *redundant1; + + crc0 = crc32(0, (uint8_t *)redundant0->data, ENV_SIZE); + crc0_ok = (crc0 == redundant0->crc); + + flag0 = redundant0->flags;
dev_current = 1; addr1 = calloc(1, CUR_ENVSIZE); @@ -1483,14 +1477,9 @@ int fw_env_open(struct env_opts *opts) ret = -ENOMEM; goto open_cleanup; } - redundant = addr1; + redundant1 = addr1;
- /* - * have to set environment.image for flash_read(), careful - - * other pointers in environment still point inside addr0 - */ - environment.image = addr1; - if (flash_io(O_RDONLY, environment.image, CUR_ENVSIZE)) { + if (flash_io(O_RDONLY, addr1, CUR_ENVSIZE)) { ret = -EIO; goto open_cleanup; } @@ -1518,18 +1507,12 @@ int fw_env_open(struct env_opts *opts) goto open_cleanup; }
- crc1 = crc32(0, (uint8_t *)redundant->data, ENV_SIZE); + crc1 = crc32(0, (uint8_t *)redundant1->data, ENV_SIZE);
- crc1_ok = (crc1 == redundant->crc); - flag1 = redundant->flags; + crc1_ok = (crc1 == redundant1->crc); + flag1 = redundant1->flags;
- /* - * environment.data still points to ((struct - * env_image_redundant *)addr0)->data. If the two - * environments differ, or one has bad crc, force a - * write-out by marking the environment dirty. - */ - if (memcmp(environment.data, redundant->data, ENV_SIZE) || + if (memcmp(redundant0->data, redundant1->data, ENV_SIZE) || !crc0_ok || !crc1_ok) environment.dirty = 1;
@@ -1540,7 +1523,7 @@ int fw_env_open(struct env_opts *opts) } else if (!crc0_ok && !crc1_ok) { fprintf(stderr, "Warning: Bad CRC, using default environment\n"); - memcpy(environment.data, default_environment, + memcpy(redundant0->data, default_environment, sizeof(default_environment)); environment.dirty = 1; dev_current = 0; @@ -1586,13 +1569,15 @@ int fw_env_open(struct env_opts *opts) */ if (dev_current) { environment.image = addr1; - environment.crc = &redundant->crc; - environment.flags = &redundant->flags; - environment.data = redundant->data; + environment.crc = &redundant1->crc; + environment.flags = &redundant1->flags; + environment.data = redundant1->data; free(addr0); } else { environment.image = addr0; - /* Other pointers are already set */ + environment.crc = &redundant0->crc; + environment.flags = &redundant0->flags; + environment.data = redundant0->data; free(addr1); } #ifdef DEBUG