linux-kernel - Re: [PATCH v2 6/9] drm/rockchip: Reoder unload sequence

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Date:   Tue, 4 Apr 2017 15:44:26 -0400
From:   Sean Paul <seanpaul@...omium.org>
To:     Jeffy Chen <jeffy.chen@...k-chips.com>
Cc:     linux-kernel@...r.kernel.org, briannorris@...omium.org,
        dianders@...omium.org, tfiga@...omium.org, seanpaul@...omium.org,
        zyw@...k-chips.com, mark.yao@...k-chips.com,
        Heiko Stuebner <heiko@...ech.de>,
        dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org,
        David Airlie <airlied@...ux.ie>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 6/9] drm/rockchip: Reoder unload sequence

On Sat, Apr 01, 2017 at 07:35:26PM +0800, Jeffy Chen wrote:
> We should not cleanup iommu before cleanup other resources.
> 
> Reorder unload sequence, follow exynos drm.

This doesn't match the cleanup sequence in rockchip_drm_bind. Also make sure
that you're unwinding the setup sequence when you cleanup (ie: take a close look
at how you set things up and reverse it for cleanup).

Sean

> 
> Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
> ---
> 
> Changes in v2: None
> 
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index b360e62..a5d83cb 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -244,11 +244,13 @@ static void rockchip_drm_unbind(struct device *dev)
>  	struct drm_device *drm_dev = dev_get_drvdata(dev);
>  
>  	rockchip_drm_fbdev_fini(drm_dev);
> -	drm_vblank_cleanup(drm_dev);
>  	drm_kms_helper_poll_fini(drm_dev);
> +
> +	drm_vblank_cleanup(drm_dev);
>  	component_unbind_all(dev, drm_dev);
> -	rockchip_iommu_cleanup(drm_dev);
>  	drm_mode_config_cleanup(drm_dev);
> +	rockchip_iommu_cleanup(drm_dev);
> +
>  	drm_dev->dev_private = NULL;
>  	drm_dev_unregister(drm_dev);
>  	drm_dev_unref(drm_dev);
> -- 
> 2.1.4
> 

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