From: John Stultz <john.stultz@linaro.org>
To: David Daney <ddaney@caviumnetworks.com>,
Andreas Schwab <schwab@linux-m68k.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Alessandro Zummo <a.zummo@towertech.it>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: RTC seems broken on 2.6.38-rc1 for RTCs lacking alarms.
Date: Thu, 20 Jan 2011 13:16:36 -0800 [thread overview]
Message-ID: <1295558196.2998.85.camel@work-vm> (raw)
In-Reply-To: <4D38A051.2010301@caviumnetworks.com>
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.
thanks
-john
next prev parent reply other threads:[~2011-01-20 21:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-20 20:51 RTC seems broken on 2.6.38-rc1 for RTCs lacking alarms David Daney
2011-01-20 21:16 ` John Stultz [this message]
2011-01-20 21:24 ` Geert Uytterhoeven
2011-01-20 22:23 ` John Stultz
2011-01-20 22:54 ` David Daney
2011-01-21 10:48 ` Andreas Schwab
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