Subject: [PATCH v2 1/5] clk: samsung: Fix double add of syscore ops after driver rebind

From: [email-masked] (Sylwester Nawrocki)
Date: Wed, 03 Dec 2014 13:10:55 +0100

On 26/11/14 15:24, Krzysztof Kozlowski wrote:
> During driver unbind the syscore ops were not unregistered which lead to
> double add on syscore list:
> 
> $ echo "3810000.audss-clock-controller" > /sys/bus/platform/drivers/exynos-audss-clk/unbind
> $ echo "3810000.audss-clock-controller" > /sys/bus/platform/drivers/exynos-audss-clk/bind
> [ 1463.044061] ------------[ cut here ]------------
> [ 1463.047255] WARNING: CPU: 0 PID: 1 at lib/list_debug.c:36 __list_add+0x8c/0xc0()
> [ 1463.054613] list_add double add: new=c06e52c0, prev=c06e52c0, next=c06d5f84.
> [ 1463.061625] Modules linked in:
> [ 1463.064623] CPU: 0 PID: 1 Comm: bash Tainted: G        W      3.18.0-rc5-next-20141121-00005-ga8fab06eab42-dirty #1022
> [ 1463.075338] [<c0014e2c>] (unwind_backtrace) from [<c0011d80>] (show_stack+0x10/0x14)
> [ 1463.083046] [<c0011d80>] (show_stack) from [<c048bb70>] (dump_stack+0x70/0xbc)
> [ 1463.090236] [<c048bb70>] (dump_stack) from [<c00233d4>] (warn_slowpath_common+0x74/0xb0)
> [ 1463.098295] [<c00233d4>] (warn_slowpath_common) from [<c00234a4>] (warn_slowpath_fmt+0x30/0x40)
> [ 1463.106962] [<c00234a4>] (warn_slowpath_fmt) from [<c020fe80>] (__list_add+0x8c/0xc0)
> [ 1463.114760] [<c020fe80>] (__list_add) from [<c0282094>] (register_syscore_ops+0x30/0x3c)
> [ 1463.122819] [<c0282094>] (register_syscore_ops) from [<c0392f20>] (exynos_audss_clk_probe+0x36c/0x460)
> [ 1463.132091] [<c0392f20>] (exynos_audss_clk_probe) from [<c0283084>] (platform_drv_probe+0x48/0xa4)
> [ 1463.141013] [<c0283084>] (platform_drv_probe) from [<c0281a14>] (driver_probe_device+0x13c/0x37c)
> [ 1463.149852] [<c0281a14>] (driver_probe_device) from [<c0280560>] (bind_store+0x90/0xe0)
> [ 1463.157822] [<c0280560>] (bind_store) from [<c027fd10>] (drv_attr_store+0x20/0x2c)
> [ 1463.165363] [<c027fd10>] (drv_attr_store) from [<c0143898>] (sysfs_kf_write+0x4c/0x50)
> [ 1463.173252] [<c0143898>] (sysfs_kf_write) from [<c0142c80>] (kernfs_fop_write+0xbc/0x198)
> [ 1463.181395] [<c0142c80>] (kernfs_fop_write) from [<c00e2be0>] (vfs_write+0xa0/0x1a8)
> [ 1463.189104] [<c00e2be0>] (vfs_write) from [<c00e2f00>] (SyS_write+0x40/0x8c)
> [ 1463.196122] [<c00e2f00>] (SyS_write) from [<c000f2a0>] (ret_fast_syscall+0x0/0x48)
> [ 1463.203655] ---[ end trace 08f6710c9bc8d8f3 ]---
> [ 1463.208244] exynos-audss-clk 3810000.audss-clock-controller: setup completed
> 
> Signed-off-by: Krzysztof Kozlowski <[email-masked]>
> Fixes: 1241ef94ccc3 ("clk: samsung: register audio subsystem clocks using common clock framework")
> Cc: <[email-masked]>

Thanks for the fix, I applied the patch to my tree.

> ---
>  drivers/clk/samsung/clk-exynos-audss.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/clk/samsung/clk-exynos-audss.c b/drivers/clk/samsung/clk-exynos-audss.c
> index acce708ace18..7c4368e75ede 100644
> --- a/drivers/clk/samsung/clk-exynos-audss.c
> +++ b/drivers/clk/samsung/clk-exynos-audss.c
> @@ -210,6 +210,10 @@ static int exynos_audss_clk_remove(struct platform_device *pdev)
>  {
>  	int i;
>  
> +#ifdef CONFIG_PM_SLEEP
> +	unregister_syscore_ops(&exynos_audss_clk_syscore_ops);
> +#endif
> +

--
Regards,
Sylwester