Re: [PATCH RESEND] drm/rockchip: Unregister platform drivers in reverse order

From: "Heiko Stübner" <heiko@sntech.de>
To: Sandy Huang <hjc@rock-chips.com>,
	Andy Yan <andy.yan@rock-chips.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
	Sean Paul <seanpaul@chromium.org>,
	Jeffy Chen <jeffy.chen@rock-chips.com>,
	Andrzej Hajda <andrzej.hajda@intel.com>,
	Mark Yao <markyao0591@gmail.com>,
	Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Cc: kernel@collabora.com, dri-devel@lists.freedesktop.org,
	linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH RESEND] drm/rockchip: Unregister platform drivers in reverse order
Date: Thu, 15 Aug 2024 16:21:42 +0200	[thread overview]
Message-ID: <9027071.qdD9tO9HgI@diego> (raw)
In-Reply-To: <20240808-rk-drm-fix-unreg-v1-1-c30d9a754722@collabora.com>

Am Donnerstag, 8. August 2024, 13:58:02 CEST schrieb Cristian Ciocaltea:
> Move rockchip_drm_platform_driver unregistration after its sub-drivers,
> which ensures all drivers are unregistered in the reverse order used
> when they were registered.

are you sure about that?

I.e. currently rockchip_drm_init() does 
  platform_register_drivers(rockchip_sub_drivers, ...)
to register the sub-drivers and only after that registers the main
drm-platform-driver

rockchip_drm_fini currently does the reverse of first unregistering the
main drm-platform-driver and after that unregistering the array of sub-
drivers.

So as it stands right now, rockchip_drm_fini does already do exactly the
reverse when de-registering.

> Fixes: 8820b68bd378 ("drm/rockchip: Refactor the component match logic.")
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
> ---
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index 44d769d9234d..ca7b07503fbe 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -528,10 +528,9 @@ static int __init rockchip_drm_init(void)
>  
>  static void __exit rockchip_drm_fini(void)
>  {
> -	platform_driver_unregister(&rockchip_drm_platform_driver);
> -
>  	platform_unregister_drivers(rockchip_sub_drivers,
>  				    num_rockchip_sub_drivers);
> +	platform_driver_unregister(&rockchip_drm_platform_driver);
>  }
>  
>  module_init(rockchip_drm_init);
> 
> ---
> base-commit: 1eb586a9782cde8e5091b9de74603e0a8386b09e
> change-id: 20240702-rk-drm-fix-unreg-9f3f29996a00
> 

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