linux-kernel - Re: [PATCH v4 2/7] coresight: of_get_coresight_platform_data: Add missing of_node

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Message-ID: <574d8e6b-cd2d-c1be-6c14-09e8be147e93@arm.com>
Date:   Fri, 17 Mar 2017 15:09:23 +0000
From:   Suzuki K Poulose <Suzuki.Poulose@....com>
To:     Leo Yan <leo.yan@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Wei Xu <xuwei5@...ilicon.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Guodong Xu <guodong.xu@...aro.org>,
        John Stultz <john.stultz@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, mike.leach@...aro.org,
        sudeep.holla@....com
Subject: Re: [PATCH v4 2/7] coresight: of_get_coresight_platform_data: Add
 missing of_node_put

On 17/03/17 15:02, Leo Yan wrote:
> From: Suzuki K Poulose <suzuki.poulose@....com>
>
> The of_get_coresight_platform_data iterates over the possible CPU nodes
> to find a given cpu phandle. However it does not drop the reference
> to the node pointer returned by the of_get_coresight_platform_data.
>
> [Leo: minor tweaks for of_get_coresight_platform_data]
>
> Cc: Leo Yan <leo.yan@...aro.org>
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>

You should add your Signed-off-by here when you send somebody's patch, irrespective
of whether you have modified it or not.
e.g:

Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
[Leo: minor tweaks for of_get_coresight_platform_data]
Signed-off-by: Leo Yan <leo.yan@...aro.org>


> ---
>  drivers/hwtracing/coresight/of_coresight.c | 17 ++++++++++-------
>  1 file changed, 10 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
> index 629e031..917ca39 100644
> --- a/drivers/hwtracing/coresight/of_coresight.c
> +++ b/drivers/hwtracing/coresight/of_coresight.c
> @@ -108,7 +108,8 @@ struct coresight_platform_data *of_get_coresight_platform_data(
>  	struct coresight_platform_data *pdata;
>  	struct of_endpoint endpoint, rendpoint;
>  	struct device *rdev;
> -	struct device_node *dn;
> +	bool found;
> +	struct device_node *dn, *np;
>  	struct device_node *ep = NULL;
>  	struct device_node *rparent = NULL;
>  	struct device_node *rport = NULL;
> @@ -175,17 +176,19 @@ struct coresight_platform_data *of_get_coresight_platform_data(
>  		} while (ep);
>  	}
>
> -	/* Affinity defaults to CPU0 */
> -	pdata->cpu = 0;
>  	dn = of_parse_phandle(node, "cpu", 0);
> -	for (cpu = 0; dn && cpu < nr_cpu_ids; cpu++) {
> -		if (dn == of_get_cpu_node(cpu, NULL)) {
> -			pdata->cpu = cpu;
> +	for_each_possible_cpu(cpu) {
> +		np = of_get_cpu_node(cpu, NULL);
> +		found = (dn == np);
> +		of_node_put(np);
> +		if (found)
>  			break;
> -		}
>  	}
>  	of_node_put(dn);
>
> +	/* Affinity to CPU0 if no cpu nodes are found */
> +	pdata->cpu = found ? cpu : 0;
> +
>  	return pdata;
>  }
>  EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
>