[PATCH 1/2] state: don't keep pointers to any device tree data

[Sascha Hauer]

On Thu, Sep 15, 2016 at 08:10:13AM +0200, Michael Olbrich wrote:
> Caching pointers to device tree nodes or names is not save. The barebox
> internal device tree may be changed by loading a new device tree or through
> fixup handlers.
> Use local copies of the full path instead and resolve the node as needed.
>

This should be two patches, one for backend->of_path and one
state->root. When reviewing this I first had to understand that this
patch has two unrelated changes.


> Signed-off-by: Michael Olbrich <m.olbrich at pengutronix.de>
> ---
>  common/state/backend.c |  3 ++-
>  common/state/state.c   | 19 ++++++++++++-------
>  common/state/state.h   |  4 ++--
>  3 files changed, 16 insertions(+), 10 deletions(-)
> 
> diff --git a/common/state/backend.c b/common/state/backend.c
> index 2f2e6dfd32d1..5235bb0283dd 100644
> --- a/common/state/backend.c
> +++ b/common/state/backend.c
> @@ -164,7 +164,7 @@ int state_backend_init(struct state_backend *backend, struct device_d *dev,
>  	if (ret)
>  		goto out_free_format;
>  
> -	backend->of_path = of_path;
> +	backend->of_path = xstrdup(of_path);
>  
>  	return 0;
>  
> @@ -185,4 +185,5 @@ void state_backend_free(struct state_backend *backend)
>  	state_storage_free(&backend->storage);
>  	if (backend->format)
>  		state_format_free(backend->format);
> +	free(backend->of_path);
>  }
> diff --git a/common/state/state.c b/common/state/state.c
> index 9b1d4edef132..0c329cd67548 100644
> --- a/common/state/state.c
> +++ b/common/state/state.c
> @@ -202,15 +202,19 @@ struct device_node *state_to_node(struct state *state,
>  				  enum state_convert conv)
>  {
>  	struct device_node *child;
> -	struct device_node *root;
> +	struct device_node *root, *state_root;
>  	int ret;
>  
> -	root = of_new_node(parent, state->root->name);
> +	state_root = of_find_node_by_path(state->of_path);
> +	if (!state_root)
> +		return ERR_PTR(-ENODEV);

Shouldn't you create the node if it's not there in the target device
tree?

Sascha


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