linux-kernel - Re: [PATCH v2 2/7] clocksource: Add Tegra186 timers support

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Message-ID: <20200403201541.GC282587@ulmo>
Date:   Fri, 3 Apr 2020 22:15:41 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Jon Hunter <jonathanh@...dia.com>, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/7] clocksource: Add Tegra186 timers support

On Fri, Apr 03, 2020 at 07:33:24PM +0300, Dmitry Osipenko wrote:
> 01.04.2020 01:19, Thierry Reding пишет:
> ...
> > +static int tegra186_timer_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct tegra186_timer *tegra;
> > +	int err;
> > +
> > +	tegra = devm_kzalloc(dev, sizeof(*tegra), GFP_KERNEL);
> > +	if (!tegra)
> > +		return -ENOMEM;
> > +
> > +	tegra->soc = of_device_get_match_data(dev);
> > +	dev_set_drvdata(dev, tegra);
> > +	tegra->dev = dev;
> > +
> > +	tegra->regs = devm_platform_ioremap_resource(pdev, 0);
> > +	if (IS_ERR(tegra->regs))
> > +		return PTR_ERR(tegra->regs);
> > +
> > +	err = platform_get_irq(pdev, 0);
> > +	if (err < 0) {
> > +		dev_err(dev, "failed to get interrupt #0: %d\n", err);
> > +		return err;
> > +	}
> > +
> > +	tegra->irq = err;
> > +
> > +	err = devm_request_irq(dev, tegra->irq, tegra186_timer_irq,
> > +			       IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
> > +			       "tegra186-timer", tegra);
> 
> Looks like there is no need to store tegra->irq in the struct
> tegra186_timer.

After moving devm_request_irq() to a later point in ->probe() we now
have to store it somewhere because err is being reused. But I can store
it in a local variable instead.

Thierry

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