linux-kernel - Re: RTC seems broken on 2.6.38-rc1 for RTCs lacking alarms.

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Date:	Thu, 20 Jan 2011 22:24:56 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	David Daney <ddaney@...iumnetworks.com>,
	Andreas Schwab <schwab@...ux-m68k.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: RTC seems broken on 2.6.38-rc1 for RTCs lacking alarms.

On Thu, Jan 20, 2011 at 22:16, John Stultz <john.stultz@...aro.org> wrote:
> On Thu, 2011-01-20 at 12:51 -0800, David Daney wrote:
>> open("/dev/rtc0", O_RDONLY|O_LARGEFILE) = 3
>> ioctl(3, PRESTO_GETMOUNT or RTC_UIE_ON, 0) = 0
>> _newselect(4, [3], NULL, NULL, {5, 0})  = 0 (Timeout)
>> write(2, "select() to /dev/rtc0 to wait for"..., 55select() to /dev/rtc0
>> to wait for clock tick timed out
>> ) = 55
>> ioctl(3, PRESTO_SETPID or RTC_UIE_OFF, 0) = 0
>> close(3)                                = 0
>> exit_group(1)                           = ?
>>
>>
>> The hwclock program is asking to put the clock in UIE mode and then
>> does a select() on it.  Since the alarm doesn't work, the select times out.
>>
>> Previously the ioctl(RTC_UIE_ON) would return EINVAL:
>
> Ah. Good diagnosis! Let me try to get a patch for you and Andreas to
> test.

I'm also seeing this on m68k (ARAnyM, rtc-generic).

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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