linux-kernel - Re: [PATCH] drm/msm/dpu: dev_pm_opp_put_clkname() only when an opp

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Date:   Mon, 20 Jul 2020 18:27:50 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     robdclark@...il.com, sean@...rly.run,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH] drm/msm/dpu: dev_pm_opp_put_clkname() only when an
 opp_table exists

On 2020-07-20 17:47, Rajendra Nayak wrote:
> Its possible that dpu_bind() fails early enough before
> dev_pm_opp_set_clkname() is called. In such cases, unconditionally
> calling dev_pm_opp_put_clkname() in dpu_unbind() can result in
> a crash. Put an additional check so that dev_pm_opp_put_clkname()
> is called only when an opp_table exists.
> 
> Fixes: aa3950767d05 ("drm/msm/dpu: Use OPP API to set clk/perf state")
> Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index f2bbce4..843a1c1 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -1079,7 +1079,8 @@ static void dpu_unbind(struct device *dev,
> struct device *master, void *data)
> 
>  	if (dpu_kms->has_opp_table)
>  		dev_pm_opp_of_remove_table(dev);
> -	dev_pm_opp_put_clkname(dpu_kms->opp_table);
> +	if (dpu_kms->opp_table)
> +		dev_pm_opp_put_clkname(dpu_kms->opp_table);
>  }
> 
>  static const struct component_ops dpu_ops = {

Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>

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