Re: [PATCH v2] drm/msm/dpu: Correct dpu destroy and disable order

[Sean Paul <sean-p7yTbzM4H96eqtR555YLDQ@public.gmane.org>]

On Fri, Nov 02, 2018 at 06:19:17PM +0530, Jayant Shekhar wrote:
> In case of msm drm bind failure, dpu_mdss_destroy is triggered.
> In this function, resources are freed and pm runtime disable is
> called, which triggers dpu_mdss_disable. Now in dpu_mdss_disable,
> driver tries to access a memory which is already freed. This
> results in kernel panic. Fix this by ensuring proper sequence
> of dpu destroy and disable calls.
> 
> Changes in v2:
>    - Removed double spacings [Jeykumar]
> 
> Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>

Reviewed-by: Sean Paul <sean@poorly.run>

> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> index fd9c893..902bb4c 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
> @@ -156,18 +156,15 @@ static void dpu_mdss_destroy(struct drm_device *dev)
>  	struct dpu_mdss *dpu_mdss = to_dpu_mdss(priv->mdss);
>  	struct dss_module_power *mp = &dpu_mdss->mp;
>  
> +	pm_runtime_disable(dev->dev);
>  	_dpu_mdss_irq_domain_fini(dpu_mdss);
> -
>  	free_irq(platform_get_irq(pdev, 0), dpu_mdss);
> -
>  	msm_dss_put_clk(mp->clk_config, mp->num_clk);
>  	devm_kfree(&pdev->dev, mp->clk_config);
>  
>  	if (dpu_mdss->mmio)
>  		devm_iounmap(&pdev->dev, dpu_mdss->mmio);
>  	dpu_mdss->mmio = NULL;
> -
> -	pm_runtime_disable(dev->dev);
>  	priv->mdss = NULL;
>  }
>  
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS
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