linux-kernel - Re: [PATCH v2] perf/smmuv3: Remove the leftover put

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Date:   Wed, 18 Dec 2019 16:15:57 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Will Deacon <will@...nel.org>
Cc:     Hanjun Guo <guohanjun@...wei.com>,
        Mark Rutland <mark.rutland@....com>,
        Robin Murphy <robin.murphy@....com>,
        Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] perf/smmuv3: Remove the leftover put_cpu() in error
 path

On Mon, Dec 16, 2019 at 12:20:57PM +0000, Will Deacon wrote:
> On Wed, Dec 11, 2019 at 02:43:06PM +0800, Hanjun Guo wrote:
> > In smmu_pmu_probe(), there is put_cpu() in the error path,
> > which is wrong because we use raw_smp_processor_id() to
> > get the cpu ID, not get_cpu(), remove it.
> > 
> > While we are at it, kill 'out_cpuhp_err' altogether and
> > just return err if we fail to add the hotplug instance.
> > 
> > Acked-by: Robin Murphy <robin.murphy@....com>
> > Signed-off-by: Hanjun Guo <guohanjun@...wei.com>
> > ---
> >  drivers/perf/arm_smmuv3_pmu.c | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> > 
> > diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c
> > index 773128f..d704ecc 100644
> > --- a/drivers/perf/arm_smmuv3_pmu.c
> > +++ b/drivers/perf/arm_smmuv3_pmu.c
> > @@ -814,7 +814,7 @@ static int smmu_pmu_probe(struct platform_device *pdev)
> >  	if (err) {
> >  		dev_err(dev, "Error %d registering hotplug, PMU @%pa\n",
> >  			err, &res_0->start);
> > -		goto out_cpuhp_err;
> > +		return err;
> >  	}
> >  
> >  	err = perf_pmu_register(&smmu_pmu->pmu, name, -1);
> > @@ -833,8 +833,6 @@ static int smmu_pmu_probe(struct platform_device *pdev)
> >  
> >  out_unregister:
> >  	cpuhp_state_remove_instance_nocalls(cpuhp_state_num, &smmu_pmu->node);
> > -out_cpuhp_err:
> > -	put_cpu();
> >  	return err;
> >  }
> 
> Acked-by: Will Deacon <will@...nel.org>
> 
> Catalin -- please can you take this as a fix via the arm64 tree? I don't
> have any other perf patches pending at the moment.

Queued.

-- 
Catalin