linux-kernel - Re: [PATCH] drm/komeda: Reordered the komeda's de-init functions

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Message-ID: <8379636.aKIvcsjXCK@e123338-lin>
Date:   Fri, 23 Aug 2019 10:42:04 +0000
From:   Mihail Atanassov <Mihail.Atanassov@....com>
To:     Ayan Halder <Ayan.Halder@....com>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Liviu Dudau <Liviu.Dudau@....com>,
        Brian Starkey <Brian.Starkey@....com>,
        "malidp@...s.arm.com" <malidp@...s.arm.com>,
        "james qian wang (Arm Technology China)" <james.qian.wang@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        nd <nd@....com>
Subject: Re: [PATCH] drm/komeda: Reordered the komeda's de-init functions

On Tuesday, 20 August 2019 18:46:19 BST Ayan Halder wrote:
> The de-init routine should be doing the following in order:-
> 1. Unregister the drm device
> 2. Shut down the crtcs - failing to do this might cause a connector leakage
> See the 'commit 109c4d18e574 ("drm/arm/malidp: Ensure that the crtcs are
> shutdown before removing any encoder/connector")'
> 3. Disable the interrupts
> 4. Unbind the components
> 5. Free up DRM mode_config info
> 
> Signed-off-by: Ayan Kumar Halder <ayan.halder@....com>
> ---
>  .../gpu/drm/arm/display/komeda/komeda_kms.c   | 20 +++++++++++++------
>  1 file changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> index 89191a555c84..e219d1b67100 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> @@ -13,6 +13,7 @@
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_gem_cma_helper.h>
>  #include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_probe_helper.h>
Can we keep the include list in alphabetical order?
>  #include <drm/drm_irq.h>
>  #include <drm/drm_vblank.h>
>  
> @@ -304,24 +305,30 @@ struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
>  			       komeda_kms_irq_handler, IRQF_SHARED,
>  			       drm->driver->name, drm);
>  	if (err)
> -		goto cleanup_mode_config;
> +		goto free_component_binding;
>  
>  	err = mdev->funcs->enable_irq(mdev);
>  	if (err)
> -		goto cleanup_mode_config;
> +		goto free_component_binding;
>  
>  	drm->irq_enabled = true;
>  
>  	err = drm_dev_register(drm, 0);
>  	if (err)
> -		goto cleanup_mode_config;
> +		goto free_interrupts;
>  
>  	return kms;
>  
> -cleanup_mode_config:
> +free_interrupts:
>  	drm->irq_enabled = false;
> +	mdev->funcs->disable_irq(mdev);
> +free_component_binding:
> +	component_unbind_all(mdev->dev, drm);
> +cleanup_mode_config:
>  	drm_mode_config_cleanup(drm);
>  	komeda_kms_cleanup_private_objs(kms);
> +	drm->dev_private = NULL;
> +	drm_dev_put(drm);
>  free_kms:
>  	kfree(kms);
>  	return ERR_PTR(err);
> @@ -332,12 +339,13 @@ void komeda_kms_detach(struct komeda_kms_dev *kms)
>  	struct drm_device *drm = &kms->base;
>  	struct komeda_dev *mdev = drm->dev_private;
>  
> +	drm_dev_unregister(drm);
> +	drm_atomic_helper_shutdown(drm);
>  	drm->irq_enabled = false;
>  	mdev->funcs->disable_irq(mdev);
> -	drm_dev_unregister(drm);
>  	component_unbind_all(mdev->dev, drm);
> -	komeda_kms_cleanup_private_objs(kms);
>  	drm_mode_config_cleanup(drm);
> +	komeda_kms_cleanup_private_objs(kms);
>  	drm->dev_private = NULL;
>  	drm_dev_put(drm);
>  }
> 

Thanks. See my include order comment above, with that fixed:

Reviewed-by: Mihail Atanassov <mihail.atanassov@....com>

-- 
Mihail