[PATCH v2 2/2] android_ab: Fix ANDROID_AB_BACKUP_OFFSET
Colin McAllister
colin.mcallister at garmin.com
Thu Mar 7 23:10:29 CET 2024
Currently, setting CONFIG_AB_BACKUP_OFFSET in a target's defconfig will
not actually enable the #if protected code in android_ab.c. This is
because "CONFIG_" should have been prepended to the config macro, or the
macros defined in kconfig.h could have been used.
The code included by ANDROID_AB_BACKUP_OFFSET has been refactored to no
longer be conditionally compiled by preprocessor conditionals and
instead use C conditionals. This better aligns with the Linux kernel
style guide.
Signed-off-by: Colin McAllister <colin.mcallister at garmin.com>
Cc: Joshua Watt <JPEWhacker at gmail.com>
Cc: Simon Glass <sjg at chromium.org>
---
boot/android_ab.c | 97 ++++++++++++++++++++++-------------------------
1 file changed, 45 insertions(+), 52 deletions(-)
diff --git a/boot/android_ab.c b/boot/android_ab.c
index 9a3d15ec60..f547aa64e4 100644
--- a/boot/android_ab.c
+++ b/boot/android_ab.c
@@ -187,13 +187,12 @@ int ab_select_slot(struct blk_desc *dev_desc, struct disk_partition *part_info,
bool dec_tries)
{
struct bootloader_control *abc = NULL;
+ struct bootloader_control *backup_abc = NULL;
u32 crc32_le;
int slot, i, ret;
bool store_needed = false;
+ bool valid_backup = false;
char slot_suffix[4];
-#if ANDROID_AB_BACKUP_OFFSET
- struct bootloader_control *backup_abc = NULL;
-#endif
ret = ab_control_create_from_disk(dev_desc, part_info, &abc, 0);
if (ret < 0) {
@@ -205,53 +204,49 @@ int ab_select_slot(struct blk_desc *dev_desc, struct disk_partition *part_info,
return ret;
}
-#if ANDROID_AB_BACKUP_OFFSET
- ret = ab_control_create_from_disk(dev_desc, part_info, &backup_abc,
- ANDROID_AB_BACKUP_OFFSET);
- if (ret < 0) {
- free(abc);
- return ret;
+ if (CONFIG_ANDROID_AB_BACKUP_OFFSET) {
+ ret = ab_control_create_from_disk(dev_desc, part_info, &backup_abc,
+ CONFIG_ANDROID_AB_BACKUP_OFFSET);
+ if (ret < 0) {
+ free(abc);
+ return ret;
+ }
}
-#endif
crc32_le = ab_control_compute_crc(abc);
if (abc->crc32_le != crc32_le) {
log_err("ANDROID: Invalid CRC-32 (expected %.8x, found %.8x),",
crc32_le, abc->crc32_le);
-#if ANDROID_AB_BACKUP_OFFSET
- crc32_le = ab_control_compute_crc(backup_abc);
- if (backup_abc->crc32_le != crc32_le) {
- log_err("ANDROID: Invalid backup CRC-32 ");
- log_err("expected %.8x, found %.8x),",
- crc32_le, backup_abc->crc32_le);
-#endif
-
- log_err("re-initializing A/B metadata.\n");
+ if (CONFIG_ANDROID_AB_BACKUP_OFFSET) {
+ crc32_le = ab_control_compute_crc(backup_abc);
+ if (backup_abc->crc32_le != crc32_le) {
+ log_err(" ANDROID: Invalid backup CRC-32 ");
+ log_err("(expected %.8x, found %.8x),",
+ crc32_le, backup_abc->crc32_le);
+ } else {
+ valid_backup = true;
+ log_info(" copying A/B metadata from backup.\n");
+ memcpy(abc, backup_abc, sizeof(*abc));
+ }
+ }
+ if (!valid_backup) {
+ log_err(" re-initializing A/B metadata.\n");
ret = ab_control_default(abc);
if (ret < 0) {
-#if ANDROID_AB_BACKUP_OFFSET
- free(backup_abc);
-#endif
+ if (CONFIG_ANDROID_AB_BACKUP_OFFSET)
+ free(backup_abc);
free(abc);
return -ENODATA;
}
-#if ANDROID_AB_BACKUP_OFFSET
- } else {
- /*
- * Backup is valid. Copy it to the primary
- */
- memcpy(abc, backup_abc, sizeof(*abc));
}
-#endif
store_needed = true;
}
if (abc->magic != BOOT_CTRL_MAGIC) {
log_err("ANDROID: Unknown A/B metadata: %.8x\n", abc->magic);
-#if ANDROID_AB_BACKUP_OFFSET
- free(backup_abc);
-#endif
+ if (CONFIG_ANDROID_AB_BACKUP_OFFSET)
+ free(backup_abc);
free(abc);
return -ENODATA;
}
@@ -259,9 +254,8 @@ int ab_select_slot(struct blk_desc *dev_desc, struct disk_partition *part_info,
if (abc->version > BOOT_CTRL_VERSION) {
log_err("ANDROID: Unsupported A/B metadata version: %.8x\n",
abc->version);
-#if ANDROID_AB_BACKUP_OFFSET
- free(backup_abc);
-#endif
+ if (CONFIG_ANDROID_AB_BACKUP_OFFSET)
+ free(backup_abc);
free(abc);
return -ENODATA;
}
@@ -338,30 +332,29 @@ int ab_select_slot(struct blk_desc *dev_desc, struct disk_partition *part_info,
abc->crc32_le = ab_control_compute_crc(abc);
ret = ab_control_store(dev_desc, part_info, abc, 0);
if (ret < 0) {
-#if ANDROID_AB_BACKUP_OFFSET
- free(backup_abc);
-#endif
+ if (CONFIG_ANDROID_AB_BACKUP_OFFSET)
+ free(backup_abc);
free(abc);
return ret;
}
}
-#if ANDROID_AB_BACKUP_OFFSET
- /*
- * If the backup doesn't match the primary, write the primary
- * to the backup offset
- */
- if (memcmp(backup_abc, abc, sizeof(*abc)) != 0) {
- ret = ab_control_store(dev_desc, part_info, abc,
- ANDROID_AB_BACKUP_OFFSET);
- if (ret < 0) {
- free(backup_abc);
- free(abc);
- return ret;
+ if (CONFIG_ANDROID_AB_BACKUP_OFFSET) {
+ /*
+ * If the backup doesn't match the primary, write the primary
+ * to the backup offset
+ */
+ if (memcmp(backup_abc, abc, sizeof(*abc)) != 0) {
+ ret = ab_control_store(dev_desc, part_info, abc,
+ CONFIG_ANDROID_AB_BACKUP_OFFSET);
+ if (ret < 0) {
+ free(backup_abc);
+ free(abc);
+ return ret;
+ }
}
+ free(backup_abc);
}
- free(backup_abc);
-#endif
free(abc);
--
2.43.2
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