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

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Message-ID: <9a03714af98ea8fefa491d049f142789@codeaurora.org>
Date:   Mon, 20 Jul 2020 19:38:25 +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: dsi: dev_pm_opp_put_clkname() only when an
 opp_table exists

On 2020-07-20 17:31, Rajendra Nayak wrote:
> Its possible for msm_dsi_host_init() to fail early, before
> dev_pm_opp_set_clkname() is called. In such cases, unconditionally
> calling dev_pm_opp_put_clkname() in msm_dsi_host_destroy() results
> in a crash. Put an additional check so that dev_pm_opp_put_clkname()
> is called only when an opp_table exists.
> 
> Fixes: f99131fa7a23 ("drm/msm: dsi: Use OPP API to set clk/perf state")
> Reported-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
> Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
> ---
>  drivers/gpu/drm/msm/dsi/dsi_host.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c
> b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 0a14c4a..4f580f7 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -1936,7 +1936,8 @@ void msm_dsi_host_destroy(struct mipi_dsi_host 
> *host)
> 
>  	if (msm_host->has_opp_table)
>  		dev_pm_opp_of_remove_table(&msm_host->pdev->dev);
> -	dev_pm_opp_put_clkname(msm_host->opp_table);
> +	if (msm_host->opp_table)
> +		dev_pm_opp_put_clkname(msm_host->opp_table);
>  	pm_runtime_disable(&msm_host->pdev->dev);
>  }

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

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