No luck on linuxppc-dev, trying LKML ... -------- Forwarded Message -------- From: Joakim Tjernlund <joakim.tjernl...@infinera.com> To: linuxppc-dev linuxppc-dev <linuxppc-...@lists.ozlabs.org> Subject: 11 minute NTP hw clock update racy? Date: Mon, 27 Aug 2018 10:01:12 +0200
We see corrupt HW clock time every now and then(really hard to reproduce) Our RTC is a DS1388 on an I2C bus. Looking at ntp_notify_cmos_timer() and it's delayed work queue impl. I wonder if there could be a race here w.r.t reboot ? Could the 11 minute update kick in just as the system is about to reset the CPU? I am on 4.14.51, ppc32 and using the ppc_md.restart() hook which will reset the CPU immediately. Question, is safe to call ntp_notify_cmos_timer() when the work queue is already armed(like do_adjtimex() does) ? Jocke
