Re: [PATCH v4 5/8] tpm: replace of_find_node_by_name() with dev of_node property

[Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>]

On Wed, Sep 28, 2016 at 04:34:39AM -0400, Nayna Jain wrote:
> Using the device of_node property is a better way to refer to the
> device tree node rather than of_find_node_by_name().
> 
> Suggested-by: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
> Signed-off-by: Nayna Jain <nayna-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

/Jarkko

> ---
>  drivers/char/tpm/tpm_of.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
> index 7c30752..22b8f81 100644
> --- a/drivers/char/tpm/tpm_of.c
> +++ b/drivers/char/tpm/tpm_of.c
> @@ -29,7 +29,8 @@ int read_log_of(struct tpm_chip *chip)
>  	struct tpm_bios_log *log;
>  
>  	log = &chip->log;
> -	np = of_find_node_by_name(NULL, "vtpm");
> +	if (chip->dev.parent->of_node)
> +		np = chip->dev.parent->of_node;
>  	if (!np) {
>  		pr_err("%s: ERROR - IBMVTPM not supported\n", __func__);
>  		return -ENODEV;
> @@ -55,18 +56,15 @@ int read_log_of(struct tpm_chip *chip)
>  	if (!log->bios_event_log) {
>  		pr_err("%s: ERROR - Not enough memory for BIOS measurements\n",
>  		       __func__);
> -		of_node_put(np);
>  		return -ENOMEM;
>  	}
>  
>  	log->bios_event_log_end = log->bios_event_log + *sizep;
>  
>  	memcpy(log->bios_event_log, __va(*basep), *sizep);
> -	of_node_put(np);
>  
>  	return 0;
>  
>  cleanup_eio:
> -	of_node_put(np);
>  	return -EIO;
>  }
> -- 
> 2.5.0
> 

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