[PATCH V3 0/2] rtc-cmos: Workaround unwanted interrupt generation

From: Pratyush Anand <panand@redhat.com>
To: mingo@kernel.org, alexandre.belloni@free-electrons.com,
	tglx@linutronix.de, hpa@zytor.com, x86@kernel.org
Cc: rtc-linux@googlegroups.com, linux-kernel@vger.kernel.org,
	prarit@redhat.com, dzickus@redhat.com, dyoung@redhat.com,
	a.zummo@towertech.it, Pratyush Anand <panand@redhat.com>
Subject: [PATCH V3 0/2] rtc-cmos: Workaround unwanted interrupt generation
Date: Tue, 16 Aug 2016 08:55:42 +0530	[thread overview]
Message-ID: <cover.1470985727.git.panand@redhat.com> (raw)

We have observed on few machines with rtc-cmos devices that it generates
an interrupt before the hpet_rtc_timer_init() call is finished. This leads
to hpet_rtc_interrupt() being called before it is fully initialized.

Therefore the while-loop of hpet_cnt_ahead() in hpet_rtc_timer_reinit()
never completes. This leads to "NMI watchdog: Watchdog detected hard LOCKUP
on cpu 0".

This patch set initializes hpet_default_delta and hpet_t1_cmp before
interrupt can be raised.

Changes since V2:
  - Improved commit log further
Changes since RFC:
  - Commit log of patches has been improved.

Pratyush Anand (2):
  rtc/hpet: Factorize hpet_rtc_timer_init()
  rtc/rtc-cmos: Initialize software counters before irq is registered

 arch/x86/include/asm/hpet.h |  2 ++
 arch/x86/kernel/hpet.c      | 41 +++++++++++++++++++++++++++++++++++------
 drivers/rtc/rtc-cmos.c      | 13 ++++++++++++-
 3 files changed, 49 insertions(+), 7 deletions(-)

-- 
2.5.5