linux-kernel - Re: [PATCH v2] drm/hisilicon: Add load and unload callback functions

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Date:   Mon, 4 Jan 2021 09:04:13 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Tian Tao <tiantao6@...ilicon.com>, airlied@...ux.ie,
        daniel@...ll.ch, kraxel@...hat.com, alexander.deucher@....com,
        tglx@...utronix.de, dri-devel@...ts.freedesktop.org,
        xinliang.liu@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/hisilicon: Add load and unload callback functions

Hi,

and a happy new year.

Am 24.12.20 um 09:45 schrieb Tian Tao:
> Add the callback functions of drm_driver structure member functions
> load and unload, no need to call load in the hibmc_pci_probe function
> and unload in the hibmc_pci_remove function.

The load and unload callbacks are left over from long ago. They are now 
deprecated.* Don't use them.

> 
> v2:
> remove the hibmc_unload called from hibmc_pic_remove.

If anything, you'd want to inline hibmc's load/unload into their callers.

Best regards
Thomas

*) White lie: They are used by the old non-KMS drivers. Anything with 
KMS should not use them.

> 
> Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
> ---
>   drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 18 +++++++-----------
>   1 file changed, 7 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> index 0d4e902..10042cf 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> @@ -27,6 +27,9 @@
>   
>   DEFINE_DRM_GEM_FOPS(hibmc_fops);
>   
> +static int hibmc_load(struct drm_device *dev, unsigned long flags);
> +static void hibmc_unload(struct drm_device *dev);
> +
>   static irqreturn_t hibmc_drm_interrupt(int irq, void *arg)
>   {
>   	struct drm_device *dev = (struct drm_device *)arg;
> @@ -63,6 +66,8 @@ static const struct drm_driver hibmc_driver = {
>   	.dumb_map_offset        = drm_gem_vram_driver_dumb_mmap_offset,
>   	.gem_prime_mmap		= drm_gem_prime_mmap,
>   	.irq_handler		= hibmc_drm_interrupt,
> +	.load			= hibmc_load,
> +	.unload			= hibmc_unload,
>   };
>   
>   static int __maybe_unused hibmc_pm_suspend(struct device *dev)
> @@ -248,7 +253,7 @@ static int hibmc_hw_init(struct hibmc_drm_private *priv)
>   	return 0;
>   }
>   
> -static int hibmc_unload(struct drm_device *dev)
> +static void hibmc_unload(struct drm_device *dev)
>   {
>   	drm_atomic_helper_shutdown(dev);
>   
> @@ -256,11 +261,9 @@ static int hibmc_unload(struct drm_device *dev)
>   		drm_irq_uninstall(dev);
>   
>   	pci_disable_msi(dev->pdev);
> -
> -	return 0;
>   }
>   
> -static int hibmc_load(struct drm_device *dev)
> +static int hibmc_load(struct drm_device *dev, unsigned long flags)
>   {
>   	struct hibmc_drm_private *priv = to_hibmc_drm_private(dev);
>   	int ret;
> @@ -335,12 +338,6 @@ static int hibmc_pci_probe(struct pci_dev *pdev,
>   		goto err_return;
>   	}
>   
> -	ret = hibmc_load(dev);
> -	if (ret) {
> -		drm_err(dev, "failed to load hibmc: %d\n", ret);
> -		goto err_return;
> -	}
> -
>   	ret = drm_dev_register(dev, 0);
>   	if (ret) {
>   		drm_err(dev, "failed to register drv for userspace access: %d\n",
> @@ -363,7 +360,6 @@ static void hibmc_pci_remove(struct pci_dev *pdev)
>   	struct drm_device *dev = pci_get_drvdata(pdev);
>   
>   	drm_dev_unregister(dev);
> -	hibmc_unload(dev);
>   }
>   
>   static const struct pci_device_id hibmc_pci_table[] = {
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer



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