fw_env: simplify logic & code paths in the fw_env_open()
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>
diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index a738b91..31afef6 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -1421,9 +1421,6 @@
int ret;
- struct env_image_single *single;
- struct env_image_redundant *redundant;
-
if (!opts)
opts = &default_opts;
@@ -1439,40 +1436,37 @@
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 @@
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 @@
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 @@
} 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 @@
*/
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