linux-kernel - Re: [PATCH] PPC: Skip over OF_DT_NOP when unflattening the device tree

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Date:	Fri, 19 Mar 2010 16:50:38 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH] PPC: Skip over OF_DT_NOP when unflattening the device
 tree

On Tue, 2010-03-09 at 12:30 -0700, Jason Gunthorpe wrote:
> NOPs within the property section are skipped, but NOPs between
> OF_DT_END_NODE and OF_DT_BEGIN_NODE were not. My firmware NOPs out
> entire nodes depending on various environment parameters.
> 
> of_scan_flat_dt already handles NOP more generally..

Good catch, though that code has now moved over to drivers/of
and is a bit different. Grant is going to fix it up though.

Cheers,
Ben.

> Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> ---
>  arch/powerpc/kernel/prom.c |    7 +++++--
>  1 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
> index 4ec3008..92137b2 100644
> --- a/arch/powerpc/kernel/prom.c
> +++ b/arch/powerpc/kernel/prom.c
> @@ -408,8 +408,11 @@ static unsigned long __init unflatten_dt_node(unsigned long mem,
>  		if (!np->type)
>  			np->type = "<NULL>";
>  	}
> -	while (tag == OF_DT_BEGIN_NODE) {
> -		mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
> +	while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
> +		if (tag == OF_DT_NOP)
> +			*p += 4;
> +		else
> +			mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
>  		tag = *((u32 *)(*p));
>  	}
>  	if (tag != OF_DT_END_NODE) {


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