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Li Zhong 5025d628c8 cpufreq: fix bad unlock balance on !CONFIG_SMP 
This patch tries to fix lockdep complaint attached below.

It seems that we should always read acquire the cpufreq_rwsem,
whether CONFIG_SMP is enabled or not.  And CONFIG_HOTPLUG_CPU
depends on CONFIG_SMP, so it seems we don't need CONFIG_SMP for the
code enabled by CONFIG_HOTPLUG_CPU.

[    0.504191] =====================================
[    0.504627] [ BUG: bad unlock balance detected! ]
[    0.504627] 3.11.0-rc6-next-20130819 #1 Not tainted
[    0.504627] -------------------------------------
[    0.504627] swapper/1 is trying to release lock (cpufreq_rwsem) at:
[    0.504627] [<ffffffff813d927a>] cpufreq_add_dev+0x13a/0x3e0
[    0.504627] but there are no more locks to release!
[    0.504627]
[    0.504627] other info that might help us debug this:
[    0.504627] 1 lock held by swapper/1:
[    0.504627]  #0:  (subsys mutex#4){+.+.+.}, at: [<ffffffff8134a7bf>] subsys_interface_register+0x4f/0xe0
[    0.504627]
[    0.504627] stack backtrace:
[    0.504627] CPU: 0 PID: 1 Comm: swapper Not tainted 3.11.0-rc6-next-20130819 #1
[    0.504627] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
[    0.504627]  ffffffff813d927a ffff88007f847c98 ffffffff814c062b ffff88007f847cc8
[    0.504627]  ffffffff81098bce ffff88007f847cf8 ffffffff81aadc30 ffffffff813d927a
[    0.504627]  00000000ffffffff ffff88007f847d68 ffffffff8109d0be 0000000000000006
[    0.504627] Call Trace:
[    0.504627]  [<ffffffff813d927a>] ? cpufreq_add_dev+0x13a/0x3e0
[    0.504627]  [<ffffffff814c062b>] dump_stack+0x19/0x1b
[    0.504627]  [<ffffffff81098bce>] print_unlock_imbalance_bug+0xfe/0x110
[    0.504627]  [<ffffffff813d927a>] ? cpufreq_add_dev+0x13a/0x3e0
[    0.504627]  [<ffffffff8109d0be>] lock_release_non_nested+0x1ee/0x310
[    0.504627]  [<ffffffff81099d0e>] ? mark_held_locks+0xae/0x120
[    0.504627]  [<ffffffff811510cb>] ? kfree+0xcb/0x1d0
[    0.504627]  [<ffffffff813d77ea>] ? cpufreq_policy_free+0x4a/0x60
[    0.504627]  [<ffffffff813d927a>] ? cpufreq_add_dev+0x13a/0x3e0
[    0.504627]  [<ffffffff8109d2a4>] lock_release+0xc4/0x250
[    0.504627]  [<ffffffff8106c9f3>] up_read+0x23/0x40
[    0.504627]  [<ffffffff813d927a>] cpufreq_add_dev+0x13a/0x3e0
[    0.504627]  [<ffffffff8134a809>] subsys_interface_register+0x99/0xe0
[    0.504627]  [<ffffffff81b19f3b>] ? cpufreq_gov_dbs_init+0x12/0x12
[    0.504627]  [<ffffffff813d7f0d>] cpufreq_register_driver+0x9d/0x1d0
[    0.504627]  [<ffffffff81b19f3b>] ? cpufreq_gov_dbs_init+0x12/0x12
[    0.504627]  [<ffffffff81b1a039>] acpi_cpufreq_init+0xfe/0x1f8
[    0.504627]  [<ffffffff810002ba>] do_one_initcall+0xda/0x180
[    0.504627]  [<ffffffff81ae301e>] kernel_init_freeable+0x12c/0x1bb
[    0.504627]  [<ffffffff81ae2841>] ? do_early_param+0x8c/0x8c
[    0.504627]  [<ffffffff814b4dd0>] ? rest_init+0x140/0x140
[    0.504627]  [<ffffffff814b4dde>] kernel_init+0xe/0xf0
[    0.504627]  [<ffffffff814d029a>] ret_from_fork+0x7a/0xb0
[    0.504627]  [<ffffffff814b4dd0>] ? rest_init+0x140/0x140

Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Acked-and-tested-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-08-21 02:04:31 +02:00
..
acpi-cpufreq.c
acpi-cpufreq: Use cpufreq_freq_attr_rw to define the cpb attribute
2013-08-14 22:24:22 +02:00
amd_freq_sensitivity.c
cpufreq: AMD "frequency sensitivity feedback" powersave bias for ondemand governor
2013-04-10 13:19:26 +02:00
arm_big_little_dt.c
cpufreq: arm_big_little_dt: Instantiate as platform_driver
2013-05-22 12:43:33 +02:00
arm_big_little.c
cpufreq: arm-big-little: call CPUFREQ_POSTCHANGE notfier in error cases
2013-06-24 18:18:58 +05:30
arm_big_little.h
cpufreq: ARM big LITTLE: Move cpu_to_cluster() to arm_big_little.h
2013-05-12 14:04:15 +02:00
at32ap-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
blackfin-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
cpufreq_conservative.c
Merge back earlier 'pm-cpufreq' material
2013-08-14 22:21:16 +02:00
cpufreq_governor.c
Merge back earlier 'pm-cpufreq' material
2013-08-14 22:21:16 +02:00
cpufreq_governor.h
Merge back earlier 'pm-cpufreq' material
2013-08-14 22:21:16 +02:00
cpufreq_ondemand.c
Merge back earlier 'pm-cpufreq' material
2013-08-14 22:21:16 +02:00
cpufreq_performance.c
cpufreq: Clean up header files included in the core
2013-08-07 23:34:09 +02:00
cpufreq_powersave.c
cpufreq: Clean up header files included in the core
2013-08-07 23:34:09 +02:00
cpufreq_stats.c
cpufreq: Use sizeof(*ptr) convetion for computing sizes
2013-08-07 23:34:10 +02:00
cpufreq_userspace.c
cpufreq: Fix minor formatting issues
2013-06-21 01:06:34 +02:00
cpufreq-cpu0.c
cpufreq: cpufreq-cpu0: NULL is a valid regulator
2013-08-14 22:24:22 +02:00
cpufreq-nforce2.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
cpufreq.c
cpufreq: fix bad unlock balance on !CONFIG_SMP
2013-08-21 02:04:31 +02:00
cris-artpec3-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
cris-etraxfs-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
davinci-cpufreq.c
cpufreq: davinci: call CPUFREQ_POSTCHANGE notfier in error cases
2013-06-24 18:18:58 +05:30
dbx500-cpufreq.c
cpufreq: delete __cpuinit usage from all cpufreq files
2013-07-14 19:36:57 -04:00
e_powersaver.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
elanfreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
exynos4x12-cpufreq.c
arm-soc: cleanups
2013-02-21 14:58:40 -08:00
exynos4210-cpufreq.c
arm-soc: cleanups
2013-02-21 14:58:40 -08:00
exynos5250-cpufreq.c
arm-soc: cleanups
2013-02-21 14:58:40 -08:00
exynos5440-cpufreq.c
cpufreq: exynos5440: Fix to skip when new frequency same as current
2013-08-12 12:00:18 +05:30
exynos-cpufreq.c
Merge branch 'cpufreq-fixes' of git://git.linaro.org/people/vireshk/linux into pm-cpufreq
2013-08-14 22:22:57 +02:00
exynos-cpufreq.h
cpufreq: fix EXYNOS drivers selection
2013-08-12 12:00:21 +05:30
freq_table.c
cpufreq: Clean up header files included in the core
2013-08-07 23:34:09 +02:00
gx-suspmod.c
cpufreq / gx: Fix gx_detect_chipset() __init attribute location
2013-08-14 22:24:23 +02:00
highbank-cpufreq.c
cpufreq: highbank: do not initialize array with a loop
2013-03-04 14:23:11 +01:00
ia64-acpi-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
imx6q-cpufreq.c
cpufreq: imx6q: call CPUFREQ_POSTCHANGE notfier in error cases
2013-06-24 18:19:00 +05:30
integrator-cpufreq.c
cpufreq: integrator: move cpufreq driver to drivers/cpufreq
2013-04-08 13:02:31 +02:00
intel_pstate.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
Kconfig
cpufreq: Fix incorrect dependecies for ARM SA11xx drivers
2013-05-12 14:04:16 +02:00
Kconfig.arm
cpufreq: fix EXYNOS drivers selection
2013-08-12 12:00:21 +05:30
Kconfig.powerpc
Merge branch 'pm-cpufreq-assorted' into pm-cpufreq
2013-06-27 21:46:45 +02:00
Kconfig.x86
cpufreq: X86_AMD_FREQ_SENSITIVITY: select CPU_FREQ_TABLE
2013-06-18 13:53:11 +05:30
kirkwood-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
longhaul.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
longhaul.h
cpufreq: delete __cpuinit usage from all cpufreq files
2013-07-14 19:36:57 -04:00
longrun.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
loongson2_cpufreq.c
Merge back earlier 'pm-cpufreq' material
2013-08-14 22:21:16 +02:00
Makefile
cpufreq: Remove unused APERF/MPERF support
2013-07-26 01:06:43 +02:00
maple-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
omap-cpufreq.c
cpufreq: delete __cpuinit usage from all cpufreq files
2013-07-14 19:36:57 -04:00
p4-clockmod.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
pasemi-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
pcc-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
pmac32-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
pmac64-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
powernow-k6.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
powernow-k7.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
powernow-k7.h
[CPUFREQ] Move x86 drivers to drivers/cpufreq/
2011-05-19 18:51:07 -04:00
powernow-k8.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
powernow-k8.h
cpufreq: Remove support for hardware P-state chips from powernow-k8
2012-09-09 22:05:30 +02:00
ppc_cbe_cpufreq_pervasive.c
cpufreq: powerpc/platforms/cell: move cpufreq driver to drivers/cpufreq
2013-04-10 13:19:26 +02:00
ppc_cbe_cpufreq_pmi.c
cpufreq: powerpc/platforms/cell: move cpufreq driver to drivers/cpufreq
2013-04-10 13:19:26 +02:00
ppc_cbe_cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
ppc_cbe_cpufreq.h
cpufreq: powerpc/platforms/cell: move cpufreq driver to drivers/cpufreq
2013-04-10 13:19:26 +02:00
ppc-corenet-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
pxa2xx-cpufreq.c
cpufreq / pxa2xx: Fix pxa_cpufreq_init_voltages() __init attribute location
2013-08-14 22:24:23 +02:00
pxa3xx-cpufreq.c
pxa3xx-cpufreq.c: Avoid using ARRAY_AND_SIZE(e) as a function argument
2013-08-14 22:24:23 +02:00
s3c24xx-cpufreq-debugfs.c
cpufreq: s3c24xx: move cpufreq driver to drivers/cpufreq
2013-05-20 23:04:28 +09:00
s3c24xx-cpufreq.c
cpufreq / s3c24xx: Fix s3c_cpufreq_initclks() __init attribute location
2013-08-14 22:24:24 +02:00
s3c64xx-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
s3c2410-cpufreq.c
cpufreq: s3c24xx: move cpufreq driver to drivers/cpufreq
2013-05-20 23:04:28 +09:00
s3c2412-cpufreq.c
cpufreq: s3c24xx: move cpufreq driver to drivers/cpufreq
2013-05-20 23:04:28 +09:00
s3c2416-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
s3c2440-cpufreq.c
cpufreq: s3c24xx: move cpufreq driver to drivers/cpufreq
2013-05-20 23:04:28 +09:00
s5pv210-cpufreq.c
cpufreq: Notify all policy->cpus in cpufreq_notify_transition()
2013-04-02 15:24:00 +02:00
sa1100-cpufreq.c
cpufreq: sa11x0: move cpufreq driver to drivers/cpufreq
2013-04-10 13:19:24 +02:00
sa1110-cpufreq.c
cpufreq: sa11x0: move cpufreq driver to drivers/cpufreq
2013-04-10 13:19:24 +02:00
sc520_freq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
sh-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
sparc-us2e-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
sparc-us3-cpufreq.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
spear-cpufreq.c
cpufreq: rename index as driver_data in cpufreq_frequency_table
2013-06-04 14:25:59 +02:00
speedstep-centrino.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
speedstep-ich.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
speedstep-lib.c
cpufreq: Add support for x86 cpuinfo auto loading v4
2012-01-26 16:49:06 -08:00
speedstep-lib.h
[CPUFREQ] Move x86 drivers to drivers/cpufreq/
2011-05-19 18:51:07 -04:00
speedstep-smi.c
cpufreq: Drop the owner field from struct cpufreq_driver
2013-08-10 03:24:47 +02:00
tegra-cpufreq.c
Merge branch 'pm-cpufreq-arm' into pm-cpufreq
2013-06-27 21:47:03 +02:00
unicore2-cpufreq.c
cpufreq: unicore2: Staticize local symbol
2013-08-14 22:24:24 +02:00