linux-kernel - Re: [PATCH v3] cpufreq: scmi: Skip SCMI devices that aren't used by the CPUs

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Message-ID: <20250507-analytic-practical-carp-5cddaf@sudeepholla>
Date: Wed, 7 May 2025 14:12:36 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: Cristian Marussi <cristian.marussi@....com>,
	Mike Tipton <quic_mdtipton@...cinc.com>
Cc: "Rafael J . Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>, <arm-scmi@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Peng Fan <peng.fan@....nxp.com>,
	Peng Fan <peng.fan@....com>
Subject: Re: [PATCH v3] cpufreq: scmi: Skip SCMI devices that aren't used by
 the CPUs

On Wed, May 07, 2025 at 12:59:45PM +0100, Cristian Marussi wrote:
> On Mon, Apr 28, 2025 at 07:47:28AM -0700, Mike Tipton wrote:
> > +static bool scmi_dev_used_by_cpus(struct device *scmi_dev)
> > +{
> > +	struct device_node *scmi_np = dev_of_node(scmi_dev);
> > +	struct device_node *np;
> > +	struct device *cpu_dev;
> > +	int cpu, idx;
> > +
> > +	if (!scmi_np)
> > +		return false;
> > +
> > +	for_each_possible_cpu(cpu) {
> > +		cpu_dev = get_cpu_device(cpu);
> > +		if (!cpu_dev)
> > +			continue;
> > +
> > +		np = dev_of_node(cpu_dev);
> > +
> > +		if (of_parse_phandle(np, "clocks", 0) == scmi_np)
> 
> Shouldn't this, on Success, be released by an of_node_put() (or, BETTER,
> by some OF-related cleanup.h magic...)
> 

Good catch, I missed this.

With the above issue fixed, you can add and post new version:
Reviewed-by: Sudeep Holla <sudeep.holla@....com>

I will drop this patch now that you need to fix and repost. Also Viresh
may be away, so better to route via his tree when he is back as I can't
take it without his ack. I was holding off my PR for this, but I will
send SCMI PR without this now.

-- 
Regards,
Sudeep