[PATCH 07/21] drm/msm/dsi: initialize postdiv_lock before use for 10nm pll

[Archit Taneja]

On Monday 09 July 2018 11:01 PM, Sean Paul wrote:
> From: Rajesh Yadav <ryadav at codeaurora.org>
> 
> postdiv_lock spinlock was used before initialization
> for 10nm pll. It causes following spin_bug:
> 	"BUG: spinlock bad magic on CPU#0".
> Initialize spinlock before its usage.

Reviewed-by: Archit Taneja <architt at codeaurora.org>

> 
> Signed-off-by: Rajesh Yadav <ryadav at codeaurora.org>
> Signed-off-by: Sean Paul <seanpaul at chromium.org>
> ---
>   drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c
> index c4c37a7df637..4c03f0b7343e 100644
> --- a/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c
> +++ b/drivers/gpu/drm/msm/dsi/pll/dsi_pll_10nm.c
> @@ -798,6 +798,8 @@ struct msm_dsi_pll *msm_dsi_pll_10nm_init(struct platform_device *pdev, int id)
>   		return ERR_PTR(-ENOMEM);
>   	}
>   
> +	spin_lock_init(&pll_10nm->postdiv_lock);
> +
>   	pll = &pll_10nm->base;
>   	pll->min_rate = 1000000000UL;
>   	pll->max_rate = 3500000000UL;
>