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

[Paul Mundt <lethal@linux-sh.org>]

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.