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-rw-r--r--common/state/state.c19
1 files changed, 18 insertions, 1 deletions
diff --git a/common/state/state.c b/common/state/state.c
index 73dfb586e..25d950211 100644
--- a/common/state/state.c
+++ b/common/state/state.c
@@ -44,6 +44,8 @@ int state_save(struct state *state)
void *buf;
ssize_t len;
int ret;
+ struct state_backend_storage_bucket *bucket;
+ struct state_backend_storage *storage;
if (!state->dirty)
return 0;
@@ -55,7 +57,19 @@ int state_save(struct state *state)
return ret;
}
- ret = state_storage_write(&state->storage, buf, len);
+ storage = &state->storage;
+ if (state->keep_prev_content) {
+ bool has_content = 0;
+ list_for_each_entry(bucket, &storage->buckets, bucket_list)
+ has_content |= bucket->wrong_magic;
+ if (has_content) {
+ dev_err(&state->dev, "Found foreign content on backend, won't overwrite.\n");
+ ret = -EPERM;
+ goto out;
+ }
+ }
+
+ ret = state_storage_write(storage, buf, len);
if (ret) {
dev_err(&state->dev, "Failed to write packed state, %d\n", ret);
goto out;
@@ -623,6 +637,9 @@ struct state *state_new_from_node(struct device_node *node, bool readonly)
of_property_read_string(node, "backend-storage-type", &storage_type);
+ state->keep_prev_content = of_property_read_bool(node,
+ "keep-previous-content");
+
ret = state_format_init(state, backend_type, node, alias);
if (ret)
goto out_release_state;