linux-kernel - Re: [PATCHv3 3/8] rtc: add STM32 RTC driver

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Message-ID: <20170111000803.mlie6kizcsj2o7lh@piout.net>
Date:   Wed, 11 Jan 2017 01:08:03 +0100
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Amelie Delaunay <amelie.delaunay@...com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Russell King <linux@...linux.org.uk>,
        rtc-linux@...glegroups.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Gabriel Fernandez <gabriel.fernandez@...com>
Subject: Re: [PATCHv3 3/8] rtc: add STM32 RTC driver

Looks good to me, however...


On 05/01/2017 at 14:43:24 +0100, Amelie Delaunay wrote :
> +struct stm32_rtc {
> +	struct rtc_device *rtc_dev;
> +	void __iomem *base;
> +	struct clk *ck_rtc;
> +	spinlock_t lock; /* Protects registers accesses */

This spinlock seems to be useless, the rtc ops_lock is already
protecting everywhere it is taken.

> +	int irq_alarm;
> +};
> +

[...]

> +static int stm32_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> +	struct stm32_rtc *rtc = dev_get_drvdata(dev);
> +	struct rtc_time *tm = &alrm->time;
> +	unsigned long irqflags;
> +	unsigned int cr, isr, alrmar;
> +	int ret = 0;
> +
> +	if (rtc_valid_tm(tm)) {
> +		dev_err(dev, "Alarm time not valid.\n");
> +		return -EINVAL;

This will never happen, tm is already checked multiple times (up to
three) in the core before this function can be called.

> +	}
> +

You don't need to resend the whole series, just this patch. I'll take
2/8 and 3/8, the other ones can go through the stm32 tree.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com