linux-kernel - Re: [rtc-linux] [PATCH v3 2/3] rtc: mediatek: Add MT6397 RTC driver

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Date:	Wed, 6 May 2015 11:32:31 +0800
From:	Eddie Huang <eddie.huang@...iatek.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:	Joe Perches <joe@...ches.com>, Lee Jones <lee.jones@...aro.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Tomasz Figa" <tfiga@...gle.com>,
	Uwe Kleine-König <kernel@...gutronix.de>,
	<srv_heupstream@...iatek.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>, <rtc-linux@...glegroups.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>,
	Tianping Fang <tianping.fang@...iatek.com>
Subject: Re: [rtc-linux] [PATCH v3 2/3] rtc: mediatek: Add MT6397 RTC driver

Hi Joe and Alexandre,

On Tue, 2015-05-05 at 23:01 +0200, Alexandre Belloni wrote:
> On 05/05/2015 at 13:44:21 -0700, Joe Perches wrote :
> > I suggest moving the time_after() test into the loop,
> > use break; and remove the exit label too.
> > 
> > Maybe something like:
> > 
> > 	while (1) {
> > 		ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_BBPU,
> > 				  &data);
> > 		if (ret < 0)
> > 			break;
> > 		if (!(data & RTC_BBPU_CBUSY))
> > 			break;
> > 		if (time_after(jiffies, timeout)) {
> > 			ret = -ETIMEDOUT;
> > 			break;
> > 		}
> > 		cpu_relax();
> > 	}
> > 
> > 	return ret;
> 
> That certainly looks more readable.
> 

Thanks correct me that I put wrong paramters in time_after, and give me
good example. I will adopt your suggestion in next round.

Eddie


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