Re: [PATCH] of: overlay: fix overly strict check for symbols

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

On 26.09.22 11:06, Michael Riesch wrote:
> The recent patch "of: overlay: improve error handling in
> of_overlay_apply_tree" introduced overly strict checks for symbols
> in the root device tree and the overlay. However, it is legal for
> both to have no symbols. Fix the checks in order to implement the
> status quo.
> 
> Fixes: bc475fd88810 ("of: overlay: improve error handling in of_overlay_apply_tree")
> Signed-off-by: Michael Riesch <michael.riesch@wolfvision.net>


Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

FWIW, we do such fixups on the emulated Virt platforms. The device tree comes
from QEMU and lacks symbols, still barebox applies an overlay with state
and environment nodes on top of it.

Cheers,
Ahmad

> ---
>  drivers/of/overlay.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
> index 0fc440fdcf..9d112b67f1 100644
> --- a/drivers/of/overlay.c
> +++ b/drivers/of/overlay.c
> @@ -131,12 +131,12 @@ static int of_overlay_apply_symbols(struct device_node *root,
>  
>  	if (!overlay_symbols) {
>  		pr_debug("overlay doesn't have a __symbols__ node\n");
> -		return -EINVAL;
> +		return 0;
>  	}
>  
>  	if (!root_symbols) {
>  		pr_info("root doesn't have a __symbols__ node\n");
> -		return -EINVAL;
> +		return 0;
>  	}
>  
>  	list_for_each_entry(prop, &overlay_symbols->properties, list) {


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