linux-kernel - Aw: Re: [PATCH v2 3/7] rtc: mt6397: improvements of rtc driver

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Date:   Fri, 5 Jul 2019 17:35:46 +0200
From:   "Frank Wunderlich" <frank-w@...lic-files.de>
To:     "Alexandre Belloni" <alexandre.belloni@...tlin.com>
Cc:     "Lee Jones" <lee.jones@...aro.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Mark Rutland" <mark.rutland@....com>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        "Sean Wang" <sean.wang@...iatek.com>,
        "Sebastian Reichel" <sre@...nel.org>,
        "Alessandro Zummo" <a.zummo@...ertech.it>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-rtc@...r.kernel.org,
        "Eddie Huang" <eddie.huang@...iatek.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Richard Fontana" <rfontana@...hat.com>,
        "Allison Randal" <allison@...utok.net>,
        "David S . Miller" <davem@...emloft.net>,
        "Mauro Carvalho Chehab" <mchehab+samsung@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Rob Herring" <robh@...nel.org>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        "Nicolas Ferre" <nicolas.ferre@...rochip.com>,
        "Paul E . McKenney" <paulmck@...ux.ibm.com>,
        "Josef Friedl" <josef.friedl@...ed.at>
Subject: Aw: Re: [PATCH v2 3/7] rtc: mt6397: improvements of rtc driver

Hi Alexander,

thank you for the Review

> Gesendet: Donnerstag, 04. Juli 2019 um 22:43 Uhr
> Von: "Alexandre Belloni" <alexandre.belloni@...tlin.com>
> > -	rtc->rtc_dev = devm_rtc_allocate_device(rtc->dev);
> > -	if (IS_ERR(rtc->rtc_dev))
> > -		return PTR_ERR(rtc->rtc_dev);
> > +	ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
> > +					mtk_rtc_irq_handler_thread,
> > +					IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
> > +					"mt6397-rtc", rtc);
> >
>
> This change may lead to a crash and the allocation was intentionally
> placed before the irq request.

i got no crash till now, but i will try to move the allocation before irq-request

> > -	ret = request_threaded_irq(rtc->irq, NULL,
> > -				   mtk_rtc_irq_handler_thread,
> > -				   IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
> > -				   "mt6397-rtc", rtc);
> >  	if (ret) {
> >  		dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
> >  			rtc->irq, ret);
> > @@ -287,6 +281,10 @@ static int mtk_rtc_probe(struct platform_device *pdev)
> >
> >  	device_init_wakeup(&pdev->dev, 1);
> >
> > +	rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
> > +	if (IS_ERR(rtc->rtc_dev))
> > +		return PTR_ERR(rtc->rtc_dev);
> > +
> >  	rtc->rtc_dev->ops = &mtk_rtc_ops;


> >  static const struct of_device_id mt6397_rtc_of_match[] = {
> > +	{ .compatible = "mediatek,mt6323-rtc", },
>
> Unrelated change, this is not an improvement and must be accompanied by
> a documentation change.

documentation is changed in 1/7 defining this compatible. i called it improvement because existing driver now supports another chip

regards Frank