linux-kernel - [PATCH v1 0/2] exynos_mct driver: fix irq allocation and cleanup

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Date:	Thu, 13 Feb 2014 12:08:41 +0900
From:	Tarek Dakhran <t.dakhran@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tarek Dakhran <t.dakhran@...il.com>,
	Vyacheslav Tyrtov <v.tyrtov@...sung.com>,
	Tomasz Figa <t.figa@...sung.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	Tarek Dakhran <t.dakhran@...sung.com>
Subject: [PATCH v1 0/2] exynos_mct driver: fix irq allocation and cleanup

exynos4_local_timer_setup called on the secondary cpu before
irqs are enabled. request_irq can sleep, which produces next warning:

on boot:
[    0.370000] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.370000] Setting up static identity map for 0x403b5700 - 0x403b5758
[    0.395000] CPU1: Booted secondary processor
[    0.395000] ------------[ cut here ]------------
[    0.395000] WARNING: CPU: 1 PID: 0 at kernel/locking/lockdep.c:2742 lockdep_trace_alloc+0xe0/0xfc()
[    0.395000] DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags))
[    0.395000] Modules linked in:
[    0.395000] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.14.0-rc2-00004-g0db95f4 #128
[    0.395000] [<c0014308>] (unwind_backtrace) from [<c0011690>] (show_stack+0x10/0x14)
[    0.395000] [<c0011690>] (show_stack) from [<c03ae7d0>] (dump_stack+0x6c/0xb8)
[    0.395000] [<c03ae7d0>] (dump_stack) from [<c001d504>] (warn_slowpath_common+0x68/0x8c)
[    0.395000] [<c001d504>] (warn_slowpath_common) from [<c001d5bc>] (warn_slowpath_fmt+0x30/0x40)
[    0.395000] [<c001d5bc>] (warn_slowpath_fmt) from [<c0059824>] (lockdep_trace_alloc+0xe0/0xfc)
[    0.395000] [<c0059824>] (lockdep_trace_alloc) from [<c00bee24>] (kmem_cache_alloc+0x24/0x160)
[    0.395000] [<c00bee24>] (kmem_cache_alloc) from [<c0068174>] (request_threaded_irq+0x64/0x130)
[    0.395000] [<c0068174>] (request_threaded_irq) from [<c02efaf8>] (exynos4_local_timer_setup+0xd0/0x124)
[    0.395000] [<c02efaf8>] (exynos4_local_timer_setup) from [<c02efc34>] (exynos4_mct_cpu_notify+0x78/0xf0)
[    0.395000] [<c02efc34>] (exynos4_mct_cpu_notify) from [<c003d318>] (notifier_call_chain+0x44/0x84)
[    0.395000] [<c003d318>] (notifier_call_chain) from [<c001d61c>] (__cpu_notify+0x24/0x40)
[    0.395000] [<c001d61c>] (__cpu_notify) from [<c0013314>] (secondary_start_kernel+0xe4/0x134)
[    0.395000] [<c0013314>] (secondary_start_kernel) from [<40008624>] (0x40008624)
[    0.395000] ---[ end trace 347890460e745f50 ]---
[    0.420000] CPU1: update cpu_power 1024
[    0.420000] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001

on hotplug:
[  108.040000] CPU3: Booted secondary processor
[  108.040000] BUG: sleeping function called from invalid context at mm/slub.c:965
[  108.040000] in_atomic(): 1, irqs_disabled(): 128, pid: 0, name: swapper/3
[  108.040000] INFO: lockdep is turned off.
[  108.040000] irq event stamp: 0
[  108.040000] hardirqs last  enabled at (0): [<  (null)>]   (null)
[  108.040000] hardirqs last disabled at (0): [<c001b768>] copy_process.part.2+0x2a4/0x12f4
[  108.040000] softirqs last  enabled at (0): [<c001b768>] copy_process.part.2+0x2a4/0x12f4
[  108.040000] softirqs last disabled at (0): [<  (null)>]   (null)
[  108.040000] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G        W    3.14.0-rc2-00004-g0db95f4 #128
[  108.040000] [<c0014308>] (unwind_backtrace) from [<c0011690>] (show_stack+0x10/0x14)
[  108.040000] [<c0011690>] (show_stack) from [<c03ae7d0>] (dump_stack+0x6c/0xb8)
[  108.040000] [<c03ae7d0>] (dump_stack) from [<c00beed4>] (kmem_cache_alloc+0xd4/0x160)
[  108.040000] [<c00beed4>] (kmem_cache_alloc) from [<c0068174>] (request_threaded_irq+0x64/0x130)
[  108.040000] [<c0068174>] (request_threaded_irq) from [<c02efaf8>] (exynos4_local_timer_setup+0xd0/0x124)
[  108.040000] [<c02efaf8>] (exynos4_local_timer_setup) from [<c02efc34>] (exynos4_mct_cpu_notify+0x78/0xf0)
[  108.040000] [<c02efc34>] (exynos4_mct_cpu_notify) from [<c003d318>] (notifier_call_chain+0x44/0x84)
[  108.040000] [<c003d318>] (notifier_call_chain) from [<c001d61c>] (__cpu_notify+0x24/0x40)
[  108.040000] [<c001d61c>] (__cpu_notify) from [<c0013314>] (secondary_start_kernel+0xe4/0x134)
[  108.040000] [<c0013314>] (secondary_start_kernel) from [<40008624>] (0x40008624)

First patch fixes this problem by removing request_irq from exynos4_local_timer_setup
Second removes non-dt stuff.

Tested on linux kernel v3.14-rc2.
Comments and additions would be appreciated.
Thank you.
	Tarek.

Tarek Dakhran (2):
  clocksource: mct: remove request_irq from exynos4_local_timer_setup
  clocksource: mct: cleanup, remove non-dt stuff from mct

 arch/arm/mach-exynos/common.h    |    2 --
 drivers/clocksource/exynos_mct.c |   55 +++++++++++++++++++++-----------------
 2 files changed, 31 insertions(+), 26 deletions(-)

-- 
1.7.10.4

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