Subject: [PATCH] reset: sunxi: fix spinlock initialization

From: [email-masked] (Maxime Coquelin)
Date: Fri, 9 Jan 2015 12:59:36 +0100

Hi Tyler, Maxime,

On 01/08/2015 01:54 AM, Tyler Baker wrote:
> Call spin_lock_init() before the spinlocks are used, preventing a lockdep
> splat.
>
> I have been observing lockdep complaining [1] during boot on my a80 optimus [2]
> when CONFIG_PROVE_LOCKING has been enabled. This patch resolves the splat,
> and has been tested on a few other sunxi platforms without issue.
>
> [1] http://storage.kernelci.org/next/next-20150107/arm-multi_v7_defconfig+CONFIG_PROVE_LOCKING=y/lab-tbaker/boot-sun9i-a80-optimus.html
> [2] http://kernelci.org/boot/?a80-optimus
>
> Signed-off-by: Tyler Baker <[email-masked]>
> ---
> This patch was tested on 3.19.0-rc3
>
>   drivers/reset/reset-sunxi.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/reset/reset-sunxi.c b/drivers/reset/reset-sunxi.c
> index eebc52c..e37250c 100644
> --- a/drivers/reset/reset-sunxi.c
> +++ b/drivers/reset/reset-sunxi.c
> @@ -157,6 +157,8 @@ static int sunxi_reset_probe(struct platform_device *pdev)
>   	if (IS_ERR(data->membase))
>   		return PTR_ERR(data->membase);
>   
> +	spin_lock_init(&data->lock);
> +
Shouldn't the lock be initialized also in early init function 
(sunxi_reset_init) ?

Regards,
Maxime
>   	data->rcdev.owner = THIS_MODULE;
>   	data->rcdev.nr_resets = resource_size(res) * 32;
>   	data->rcdev.ops = &sunxi_reset_ops;