Re: [rtc-linux] Re: rtc_cmos: error after first write to wakealarm

Alessandro Zummo
2007-06-19T12:24:22Z

On Fri, 15 Jun 2007 09:03:19 +0200
Tino Keitel <tino.keitel@gmx.de> wrote:

> > > I have the following strange behaviour with rtc_cmos:
> > >
> > > $ echo 1181934240 > /sys/class/rtc/rtc0/wakealarm
> > > bash: echo: write error: Device or resource busy
> > > $ rmmod rtc_cmos
> > > $ modprobe rtc_cmos
> > > $ echo 1181934240 > /sys/class/rtc/rtc0/wakealarm
> > > $ echo 1181934240 > /sys/class/rtc/rtc0/wakealarm
> > > bash: echo: write error: Device or resource busy
> > > $
> >
> > If the alarm has already been enabled, you cannot set the next alarm.
> > You should disable first.
>
> Ah, ok.
>
> Where is the documentation that describes that I have to disable it
> first, and how to do this? A migration document for /proc/acpi/alarm
> users would be nice, too.

Well, I guess there is no documentation. Maybe we could add
a dev_warn with an explicit message.

--

Best regards,

Alessandro Zummo,
Tower Technologies - Torino, Italy