linux-kernel - Re: [PATCH -mm 5/5] Blackfin: on-chip RTC controller driver

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Message-ID: <20070301091408.GA4324@linux-sh.org>
Date:	Thu, 1 Mar 2007 18:14:08 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	"Wu, Bryan" <bryan.wu@...log.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, a.zummo@...ertech.it,
	vapier@...too.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 5/5] Blackfin: on-chip RTC controller driver

On Thu, Mar 01, 2007 at 12:15:46PM +0800, Wu, Bryan wrote:
> +#define stamp(fmt, args...) pr_debug("%s:%i: " fmt "\n", __FUNCTION__, __LINE__, ## args)
> +#define stampit() stamp("here i am")
> +

Are these really necessary for the final driver? It's littered all over
the place, and presumably the driver should be functional enough to not
need this sort of debugging instrumentation.

[snip]

> +static void rtc_bfin_sync_pending(void)
> +{
> +	stampit();
> +	while (!(bfin_read_RTC_ISTAT() & RTC_ISTAT_WRITE_COMPLETE)) {
> +		if (!(bfin_read_RTC_ISTAT() & RTC_ISTAT_WRITE_PENDING))
> +			break;
> +	}
> +	bfin_write_RTC_ISTAT(RTC_ISTAT_WRITE_COMPLETE);
> +}
> +
No timeout? (and superfluous braces)

> +	case RTC_PIE_ON:
> +		stampit();
> +		spin_lock_irq(&rtc->lock);
> +		rtc_bfin_sync_pending();

And it's also called under a spinlock each time.. this is a disaster
waiting to happen.
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