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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <aBtfvuzO54XK6KOd@pluto>
Date: Wed, 7 May 2025 14:27:26 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Cristian Marussi <cristian.marussi@....com>,
	Mike Tipton <quic_mdtipton@...cinc.com>,
	Sudeep Holla <sudeep.holla@....com>,
	"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 04:18:34PM +0300, Dan Carpenter wrote:
> On Wed, May 07, 2025 at 12:59:45PM +0100, Cristian Marussi 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...)
> > 
> 
> The cleanup.h magic is __free(of_node_put) but dev_of_node() doesn't
> take a reference so I don't think it's required.
> 
 
I was referrring to the 2 (possibly) successfull of_parse_phandle() needs an
of_put() before returning. (at least looking at of_parse_phandle() comments)

Thanks,
Cristian