kernel-packages team mailing list archive

[Martin Pitt <martin.pitt@xxxxxxxxxx>]

Indeed the code in
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/rtc/hctosys.c
looks like it runs entirely "self-"triggered (late_initcall), not
triggered by an userspace call. This function tries to open the device
which simply isn't present (yet) at that time. So maybe this can be
moved after the loading of the  RTC modules somehow, or the error
message quiesced, but I'd like to defer that to a kernel engineer.

** Tags added: bot-stop-nagging xenial

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https://bugs.launchpad.net/bugs/1410604

Title:
  ISST-LTE: unable to open rtc device

Status in linux package in Ubuntu:
  Triaged

Bug description:
  == Comment: #0 - Chanh H. Nguyen <chnguyen@xxxxxxxxxx> - 2015-01-09 17:30:08 ==
  We use DVD to install Ubuntu 15.04 kernel 3.18.0-8-generic version on our PowerVM system. After install, I am seeing this error "/build/buildd/linux-3.18.0/drivers/rtc/hctosys.c: unable to open rtc device" on the dmesg log...

  root@pole1lp3:~# uname -a
  Linux pole1lp3 3.18.0-8-generic #9-Ubuntu SMP Mon Jan 5 22:52:15 UTC 2015 ppc64le ppc64le ppc64le GNU/Linux
  root@pole1lp3:~# dmesg |grep rtc
  [    0.556763] /build/buildd/linux-3.18.0/drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
  [    3.296241] rtc-generic rtc-generic: rtc core: registered rtc-generic as rtc0
  root@pole1lp3:~#

  == Comment: #2 - David Heller <hellerda@xxxxxxxxxx> - 2015-01-13 20:53:50 ==
  It must be an order of operations thing: something is trying to do the hctosys before the driver is loaded. A few seconds later the driver loads and it seems fine after that.

  root@pole1lp3:~# dmesg | grep rtc
  [    0.551202] /build/buildd/linux-3.18.0/drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
  [    3.353719] rtc-generic rtc-generic: rtc core: registered rtc-generic as rtc0

  root@pole1lp3:~# find /dev -name \*rtc\*
  /dev/rtc
  /dev/rtc0

  root@pole1lp3:~# hwclock
  Tue 13 Jan 2015 07:36:15 PM CST  -0.779773 seconds

  root@pole1lp3:~# hwclock --hctosys

  root@pole1lp3:~# date
  Tue Jan 13 19:38:05 CST 2015

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