linux-kernel - Re: [PATCH] of: property: Disable fw

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Date:   Fri, 10 Sep 2021 08:15:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Andre Muller <andre.muller@....de>, kernel-team@...roid.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of: property: Disable fw_devlink DT support for X86

On Thu, Sep 09, 2021 at 06:14:45PM -0700, Saravana Kannan wrote:
> Andre reported fw_devlink=on breaking OLPC XO-1.5 [1].
> 
> OLPC XO-1.5 is an X86 system that uses a mix of ACPI and OF to populate
> devices. The root cause seems to be ISA devices not setting their fwnode
> field. But trying to figure out how to fix that doesn't seem worth the
> trouble because the OLPC devicetree is very sparse/limited and fw_devlink
> only adds the links causing this issue. Considering that there aren't many
> users of OF in an X86 system, simply fw_devlink DT support for X86.
> 
> [1] - https://lore.kernel.org/lkml/3c1f2473-92ad-bfc4-258e-a5a08ad73dd0@web.de/
> Fixes: ea718c699055 ("Revert "Revert "driver core: Set fw_devlink=on by default""")
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> Cc: Andre Muller <andre.muller@....de>
> ---
>  drivers/of/property.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/of/property.c b/drivers/of/property.c
> index 0c0dc2e369c0..3fd74bb34819 100644
> --- a/drivers/of/property.c
> +++ b/drivers/of/property.c
> @@ -1444,6 +1444,9 @@ static int of_fwnode_add_links(struct fwnode_handle *fwnode)
>  	struct property *p;
>  	struct device_node *con_np = to_of_node(fwnode);
>  
> +	if (IS_ENABLED(CONFIG_X86))
> +		return 0;

I love it :)

Anyway, getting a "Tested-by:" would be great to have here.  Andre, can
you verify this solves your issue?

thanks,

greg k-h