linux-kernel - Re: [PATCH] of/fdt: Don't clear initial_boot_params if fdt_check

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Date:	Tue, 04 Nov 2014 16:08:39 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rob Herring <robh+dt@...nel.org>
Cc:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of/fdt: Don't clear initial_boot_params
 if fdt_check_header() fails

On Wed, 29 Oct 2014 12:15:00 -0600
, Bjorn Helgaas <bhelgaas@...gle.com>
 wrote:
> If the device tree pointer is NULL, early_init_dt_verify() fails, leaving
> initial_boot_params unchanged.  If the device tree pointer is non-NULL but
> invalid, early_init_dt_verify() again fails but this time it also clears
> initial_boot_params.
> 
> Leave initial_boot_params unchanged if the device tree pointer is invalid.
> This doesn't fix a bug, but it makes the behavior more consistent and
> easier to analyze.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>

Looks correct. Applied.

g.

> ---
>  drivers/of/fdt.c |    9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index d1ffca8b34ea..55a566a53f36 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -994,15 +994,12 @@ bool __init early_init_dt_verify(void *params)
>  	if (!params)
>  		return false;
>  
> -	/* Setup flat device-tree pointer */
> -	initial_boot_params = params;
> -
>  	/* check device tree validity */
> -	if (fdt_check_header(params)) {
> -		initial_boot_params = NULL;
> +	if (fdt_check_header(params))
>  		return false;
> -	}
>  
> +	/* Setup flat device-tree pointer */
> +	initial_boot_params = params;
>  	return true;
>  }
>  
> 

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