linux-kernel - Re: [PATCH] cpufreq: powernv: add of_node

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Date:   Mon, 26 Nov 2018 18:12:54 +0530
From:   Gautham R Shenoy <ego@...ux.vnet.ibm.com>
To:     Yangtao Li <tiny.windzz@...il.com>
Cc:     rjw@...ysocki.net, viresh.kumar@...aro.org,
        benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH] cpufreq: powernv: add of_node_put()

Hello Yangtao Li,

On Tue, Nov 20, 2018 at 07:57:31AM -0500, Yangtao Li wrote:
> use of_node_put() to release the refcount.
>

Thanks for the patch.

Reviewed-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>

> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> ---
>  drivers/cpufreq/powernv-cpufreq.c | 17 +++++++++++------
>  1 file changed, 11 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
> index bf6519cf64bc..7e7ad3879c4e 100644
> --- a/drivers/cpufreq/powernv-cpufreq.c
> +++ b/drivers/cpufreq/powernv-cpufreq.c
> @@ -253,18 +253,18 @@ static int init_powernv_pstates(void)
> 
>  	if (of_property_read_u32(power_mgt, "ibm,pstate-min", &pstate_min)) {
>  		pr_warn("ibm,pstate-min node not found\n");
> -		return -ENODEV;
> +		goto out;
>  	}
> 
>  	if (of_property_read_u32(power_mgt, "ibm,pstate-max", &pstate_max)) {
>  		pr_warn("ibm,pstate-max node not found\n");
> -		return -ENODEV;
> +		goto out;
>  	}
> 
>  	if (of_property_read_u32(power_mgt, "ibm,pstate-nominal",
>  				 &pstate_nominal)) {
>  		pr_warn("ibm,pstate-nominal not found\n");
> -		return -ENODEV;
> +		goto out;
>  	}
> 
>  	if (of_property_read_u32(power_mgt, "ibm,pstate-ultra-turbo",
> @@ -293,14 +293,14 @@ static int init_powernv_pstates(void)
>  	pstate_ids = of_get_property(power_mgt, "ibm,pstate-ids", &len_ids);
>  	if (!pstate_ids) {
>  		pr_warn("ibm,pstate-ids not found\n");
> -		return -ENODEV;
> +		goto out;
>  	}
> 
>  	pstate_freqs = of_get_property(power_mgt, "ibm,pstate-frequencies-mhz",
>  				      &len_freqs);
>  	if (!pstate_freqs) {
>  		pr_warn("ibm,pstate-frequencies-mhz not found\n");
> -		return -ENODEV;
> +		goto out;
>  	}
> 
>  	if (len_ids != len_freqs) {
> @@ -311,7 +311,7 @@ static int init_powernv_pstates(void)
>  	nr_pstates = min(len_ids, len_freqs) / sizeof(u32);
>  	if (!nr_pstates) {
>  		pr_warn("No PStates found\n");
> -		return -ENODEV;
> +		goto out;
>  	}
> 
>  	powernv_pstate_info.nr_pstates = nr_pstates;
> @@ -352,7 +352,12 @@ static int init_powernv_pstates(void)
> 
>  	/* End of list marker entry */
>  	powernv_freqs[i].frequency = CPUFREQ_TABLE_END;
> +
> +	of_node_put(power_mgt);
>  	return 0;
> +out:
> +	of_node_put(power_mgt);
> +	return -ENODEV;
>  }
> 
>  /* Returns the CPU frequency corresponding to the pstate_id. */
> -- 
> 2.17.0
>