Re: [RESEND PATCH v3 2/5] dt/powerpc/powernv: Use of_get_child_by_name to get a named child.

[Michael Ellerman <michael@ellerman.id.au>]

On Mon, 2012-09-17 at 12:58 +0100, Srinivas KANDAGATLA wrote:
> From: Srinivas Kandagatla <srinivas.kandagatla@st.com>
> 
> As follow-up to "dt: introduce of_get_child_by_name to get child node by
> name." patch, This patch removes some of the code duplication in the
> driver by replacing it with of_get_child_by_name instead.
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
> ---
>  arch/powerpc/platforms/powernv/opal.c |    6 +++---
>  1 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
> index aaa0dba..fc7ae70 100644
> --- a/arch/powerpc/platforms/powernv/opal.c
> +++ b/arch/powerpc/platforms/powernv/opal.c
> @@ -294,9 +294,9 @@ static int __init opal_init(void)
>  		consoles = of_node_get(opal_node);
>  
>  	/* Register serial ports */
> -	for_each_child_of_node(consoles, np) {
> -		if (strcmp(np->name, "serial"))
> -			continue;
> +	np = of_get_child_by_name(consoles, "serial");
> +	if (np) {
> +		of_node_put(np);
>  		of_platform_device_create(np, NULL, NULL);

You mustn't drop the reference until after you've finished with np, as
you have written it the node could be freed before you call
of_platform_device_create().

cheers