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f17a0dd1c2
linux/drivers/clk
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Paul E. McKenney f17a0dd1c2 clk: Use _rcuidle suffix to allow clk_core_enable() to used from idle 
This commit fixes the RCU use-from-idle bug corresponding the following
splat:

> [ INFO: suspicious RCU usage. ]
> 4.6.0-rc5-next-20160426+ #1127 Not tainted
> -------------------------------
> include/trace/events/clk.h:45 suspicious rcu_dereference_check() usage!
>
> other info that might help us debug this:
>
>
> RCU used illegally from idle CPU!
> rcu_scheduler_active = 1, debug_locks = 0
> RCU used illegally from extended quiescent state!
> 2 locks held by swapper/0/0:
>  #0:  (&oh->hwmod_key#30){......}, at: [<c0121afc>] omap_hwmod_enable+0x18/0x44
>  #1:  (enable_lock){......}, at: [<c0630684>] clk_enable_lock+0x18/0x124
>
> stack backtrace:
> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.6.0-rc5-next-20160426+ #1127
> Hardware name: Generic OMAP36xx (Flattened Device Tree)
> [<c0110290>] (unwind_backtrace) from [<c010c3a8>] (show_stack+0x10/0x14)
> [<c010c3a8>] (show_stack) from [<c047fd68>] (dump_stack+0xb0/0xe4)
> [<c047fd68>] (dump_stack) from [<c06315c0>] (clk_core_enable+0x1e0/0x36c)
> [<c06315c0>] (clk_core_enable) from [<c0632298>] (clk_enable+0x1c/0x38)
> [<c0632298>] (clk_enable) from [<c01204e0>] (_enable_clocks+0x18/0x7c)
> [<c01204e0>] (_enable_clocks) from [<c012137c>] (_enable+0x114/0x2ec)
> [<c012137c>] (_enable) from [<c0121b08>] (omap_hwmod_enable+0x24/0x44)
> [<c0121b08>] (omap_hwmod_enable) from [<c0122ad0>] (omap_device_enable+0x3c/0x90)
> [<c0122ad0>] (omap_device_enable) from [<c0122b34>] (_od_runtime_resume+0x10/0x38)
> [<c0122b34>] (_od_runtime_resume) from [<c052cc00>] (__rpm_callback+0x2c/0x60)
> [<c052cc00>] (__rpm_callback) from [<c052cc54>] (rpm_callback+0x20/0x80)
> [<c052cc54>] (rpm_callback) from [<c052df7c>] (rpm_resume+0x3d0/0x6f0)
> [<c052df7c>] (rpm_resume) from [<c052e2e8>] (__pm_runtime_resume+0x4c/0x64)
> [<c052e2e8>] (__pm_runtime_resume) from [<c04bf2c4>] (omap2_gpio_resume_after_idle+0x54/0x68)
> [<c04bf2c4>] (omap2_gpio_resume_after_idle) from [<c01269dc>] (omap3_enter_idle_bm+0xfc/0x1ec)
> [<c01269dc>] (omap3_enter_idle_bm) from [<c0601888>] (cpuidle_enter_state+0x80/0x3d4)
> [<c0601888>] (cpuidle_enter_state) from [<c0183b08>] (cpu_startup_entry+0x198/0x3a0)
> [<c0183b08>] (cpu_startup_entry) from [<c0b00c0c>] (start_kernel+0x354/0x3c8)
> [<c0b00c0c>] (start_kernel) from [<8000807c>] (0x8000807c)

Reported-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: <linux-omap@vger.kernel.org>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: <linux-clk@vger.kernel.org>
2016-06-15 13:45:22 -07:00
..
at91 The clk changes for this release cycle are mostly dominated by 2016-03-23 06:06:45 -07:00
bcm clk: bcm2835: fix check of error code returned by devm_ioremap_resource() 2016-03-15 18:14:11 -07:00
berlin ARM: SoC driver updates for v4.4 2015-11-10 15:00:03 -08:00
h8300 clk: h8300: Properly cast to __iomem pointer 2016-02-26 16:01:32 -08:00
hisilicon clk: hisilicon: Remove CLK_IS_ROOT 2016-03-02 17:43:32 -08:00
imx clk: imx: Remove CLK_IS_ROOT 2016-03-02 17:44:26 -08:00
ingenic
keystone clk: keystone: fix a trivial typo 2015-10-19 15:29:09 -07:00
mediatek clk: mediatek: Remove CLK_IS_ROOT 2016-03-02 17:44:06 -08:00
meson clk: meson: Fix meson_clk_register_clks() signature type mismatch 2016-02-08 14:22:44 -08:00
mmp clk: mmp: stop using platform headers 2015-12-01 21:44:22 +01:00
mvebu clk: mvebu: Remove CLK_IS_ROOT 2016-03-03 11:26:42 -08:00
mxs clk: mxs: Remove CLK_IS_ROOT 2016-03-02 17:44:59 -08:00
nxp clk: add lpc18xx creg clk driver 2016-03-04 12:52:10 -08:00
pistachio clk: pistachio: correct critical clock list 2015-08-26 11:34:43 -07:00
pxa The clk changes for this release cycle are mostly dominated by 2016-03-23 06:06:45 -07:00
qcom clk: qcom: Remove CLK_IS_ROOT 2016-03-04 12:53:53 -08:00
renesas clk: renesas: div6: use RENESAS for #define 2016-03-15 18:13:02 -07:00
rockchip The clk changes for this release cycle are mostly dominated by 2016-03-23 06:06:45 -07:00
samsung clk: samsung: Remove CLK_IS_ROOT 2016-03-02 17:46:29 -08:00
sirf clk: atlas7: fix noc/socket disconnect/reconnect for unit clks 2015-09-29 08:27:14 -07:00
socfpga clk: socfpga: allow for multiple parents on Arria10 periph clocks 2016-02-22 14:17:37 -08:00
spear clk: spear: Remove CLK_IS_ROOT 2016-03-02 17:46:55 -08:00
st clk: st: Remove impossible check for of_clk_get_parent_count() < 0 2016-02-26 16:01:32 -08:00
sunxi clk: sunxi: Remove use of variable length array 2016-03-15 15:15:27 -07:00
tegra clk: tegra: Remove CLK_IS_ROOT 2016-03-02 17:47:19 -08:00
ti ARM: SoC 64-bit changes for v4.6 2016-03-20 15:08:45 -07:00
ux500 clk: ux500: Remove CLK_IS_ROOT 2016-03-02 17:48:03 -08:00
versatile clk: versatile: Remove CLK_IS_ROOT 2016-03-15 15:19:21 -07:00
x86 clk: x86: Remove clkdev.h and clk.h includes 2016-03-03 11:27:26 -08:00
zte
zynq clk: zynq: Remove CLK_IS_ROOT 2016-03-02 17:48:26 -08:00
clk-asm9260.c
clk-axi-clkgen.c clk: axi-clkgen: Remove sometimes impossible check 2016-01-29 17:11:02 -08:00
clk-axm5516.c
clk-cdce706.c
clk-cdce925.c
clk-clps711x.c
clk-composite.c clk: move the common clock's to_clk_*(_hw) macros to clk-provider.h 2016-01-29 12:59:50 -08:00
clk-conf.c
clk-cs2000-cp.c clk: add CS2000 Fractional-N driver 2015-11-30 16:33:38 -08:00
clk-devres.c
clk-divider.c clk: optimize the divider walk in clk_divider_bestdiv() 2016-01-29 16:45:32 -08:00
clk-efm32gg.c clk: efm32gg: Remove CLK_IS_ROOT 2016-03-02 17:48:47 -08:00
clk-fixed-factor.c clk: add clk_unregister_fixed_factor() 2016-01-29 16:35:49 -08:00
clk-fixed-rate.c clk: fixed-rate: Remove CLK_IS_ROOT 2016-03-04 14:31:17 -08:00
clk-fractional-divider.c clk: move the common clock's to_clk_*(_hw) macros to clk-provider.h 2016-01-29 12:59:50 -08:00
clk-gate.c clk: move the common clock's to_clk_*(_hw) macros to clk-provider.h 2016-01-29 12:59:50 -08:00
clk-gpio.c ARM: SoC 64-bit changes for v4.6 2016-03-20 15:08:45 -07:00
clk-highbank.c
clk-ls1x.c
clk-max77686.c clk: max77{686,802}: Remove CLK_IS_ROOT 2016-03-15 15:19:49 -07:00
clk-max77802.c clk: max77{686,802}: Remove CLK_IS_ROOT 2016-03-15 15:19:49 -07:00
clk-max-gen.c
clk-max-gen.h
clk-mb86s7x.c clk: mb86s7x: Remove CLK_IS_ROOT 2016-03-03 11:27:48 -08:00
clk-moxart.c
clk-multiplier.c clk: move the common clock's to_clk_*(_hw) macros to clk-provider.h 2016-01-29 12:59:50 -08:00
clk-mux.c clk: move the common clock's to_clk_*(_hw) macros to clk-provider.h 2016-01-29 12:59:50 -08:00
clk-nomadik.c
clk-nspire.c
clk-palmas.c clk: palmas: fix a possible NULL dereference 2016-01-29 16:57:09 -08:00
clk-pwm.c clk: pwm: Remove CLK_IS_ROOT 2016-03-02 17:50:08 -08:00
clk-qoriq.c clk: qoriq: fix memory leak 2015-11-30 13:00:54 -08:00
clk-rk808.c
clk-s2mps11.c clk: s2mps11: Remove CLK_IS_ROOT 2016-03-02 17:50:32 -08:00
clk-scpi.c clk: scpi: Remove CLK_IS_ROOT 2016-03-02 17:50:58 -08:00
clk-si514.c clk: si5{14,351,70}: Remove CLK_IS_ROOT 2016-03-02 17:51:13 -08:00
clk-si570.c clk: si5{14,351,70}: Remove CLK_IS_ROOT 2016-03-02 17:51:13 -08:00
clk-si5351.c clk: si5{14,351,70}: Remove CLK_IS_ROOT 2016-03-02 17:51:13 -08:00
clk-si5351.h
clk-stm32f4.c
clk-tango4.c clk: tango4: clkgen driver for Tango4 platforms 2015-11-16 11:07:06 -08:00
clk-twl6040.c
clk-u300.c
clk-vt8500.c clk: vt8500: don't return possibly uninitialized data 2016-02-02 11:53:17 -08:00
clk-wm831x.c
clk-xgene.c clk: xgene: Add missing parenthesis when clearing divider value 2016-03-03 11:37:15 -08:00
clk.c clk: Use _rcuidle suffix to allow clk_core_enable() to used from idle 2016-06-15 13:45:22 -07:00
clk.h
clkdev.c ARM: 8503/1: clk_register_clkdev: remove format string interface 2016-02-16 16:34:18 +00:00
Kconfig Merge branch 'clk-ti' into clk-next 2016-03-01 16:23:40 -08:00
Makefile clk: renesas: move drivers to renesas directory 2016-03-03 11:22:53 -08:00