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Date:   Thu, 26 Nov 2020 14:12:26 +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, maarten.lankhorst@...ux.intel.com,
        mripard@...nel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH drm/hisilicon 2/3] drm/irq: Add the new api to install irq

Hi

Am 26.11.20 um 13:02 schrieb Tian Tao:
> Add new api devm_drm_irq_install() to register interrupts,
> no need to call drm_irq_uninstall() when the drm module is removed.
> 
> Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
> ---
>   drivers/gpu/drm/drm_irq.c | 34 ++++++++++++++++++++++++++++++++++
>   include/drm/drm_irq.h     |  2 +-
>   2 files changed, 35 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index 09d6e9e..983ad6b 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -214,6 +214,40 @@ int drm_irq_uninstall(struct drm_device *dev)
>   }
>   EXPORT_SYMBOL(drm_irq_uninstall);
>   
> +static void devm_drm_irq_uninstall(void *data)
> +{
> +	drm_irq_uninstall(data);
> +}
> +
> +/**
> + * devm_drm_irq_install - install IRQ handler
> + * @dev: DRM device
> + * @irq: IRQ number to install the handler for
> + *
> + * devm_drm_irq_install is the help function of drm_irq_install,

'the help' -> 'a helper'. I'd do a full stop with period at the end of 
the line.

> + * when the driver uses devm_drm_irq_install, there is no need

when -> If

> + * to call drm_irq_uninstall when the drm module is uninstalled,

'is uninstalled' -> 'gets unloaded'

> + * and this will done automagically.

and -> as

> + *
> + * Returns:
> + * Zero on success or a negative error code on failure.
> + */
> +int devm_drm_irq_install(struct drm_device *dev, int irq)
> +{
> +	int ret;
> +
> +	ret = drm_irq_install(dev, irq);
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_add_action(dev->dev, devm_drm_irq_uninstall, dev);
> +	if (ret)
> +		devm_drm_irq_uninstall(dev);

This pattern can be replaced by devm_add_action_or_reset()

With my comments addressed,

Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>

Best regards
Thomas

> +
> +	return ret;
> +}
> +EXPORT_SYMBOL(devm_drm_irq_install);
> +
>   #if IS_ENABLED(CONFIG_DRM_LEGACY)
>   int drm_legacy_irq_control(struct drm_device *dev, void *data,
>   			   struct drm_file *file_priv)
> diff --git a/include/drm/drm_irq.h b/include/drm/drm_irq.h
> index d77f6e6..631b22f 100644
> --- a/include/drm/drm_irq.h
> +++ b/include/drm/drm_irq.h
> @@ -28,5 +28,5 @@ struct drm_device;
>   
>   int drm_irq_install(struct drm_device *dev, int irq);
>   int drm_irq_uninstall(struct drm_device *dev);
> -
> +int devm_drm_irq_install(struct drm_device *dev, int irq);
>   #endif
> 

-- 
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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