linux-kernel - Re: [PATCH v2] drm: Add the new api to install irq

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Date:   Tue, 3 Nov 2020 10:36:32 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Tian Tao <tiantao6@...ilicon.com>
Cc:     maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...ux.ie, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm: Add the new api to install irq

Hi Tian.

Good to see more infrastructure support so one does not have to think about cleanup.

On Tue, Nov 03, 2020 at 10:10:41AM +0800, Tian Tao wrote:
> Add new api devm_drm_irq_install() to register interrupts,
> no need to call drm_irq_uninstall() when the drm module is removed.
> 
> v2:
> fixed the wrong parameter.
> 
> Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
> ---
>  drivers/gpu/drm/drm_drv.c | 23 +++++++++++++++++++++++
>  include/drm/drm_drv.h     |  3 ++-
>  2 files changed, 25 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index cd162d4..0fe5243 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -39,6 +39,7 @@
>  #include <drm/drm_color_mgmt.h>
>  #include <drm/drm_drv.h>
>  #include <drm/drm_file.h>
> +#include <drm/drm_irq.h>
>  #include <drm/drm_managed.h>
>  #include <drm/drm_mode_object.h>
>  #include <drm/drm_print.h>
> @@ -678,6 +679,28 @@ static int devm_drm_dev_init(struct device *parent,
>  	return ret;
>  }
>  
> +static void devm_drm_dev_irq_uninstall(void *data)
devm_drm_irq_uninstall??
It matches other names if you drop the _dev part.

> +{
> +	drm_irq_uninstall(data);
> +}
> +
> +int devm_drm_irq_install(struct device *parent,
> +			 struct drm_device *dev, int irq)
As this is an exported function please add appropriate kernel-doc
documentation. It should for example explain that there is no need to
uninstall as this is done automagically.

> +{
> +	int ret;
> +
> +	ret = drm_irq_install(dev, irq);
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_add_action(parent, devm_drm_dev_irq_uninstall, dev);
> +	if (ret)
> +		devm_drm_dev_irq_uninstall(dev);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL(devm_drm_irq_install);

The above are in addition to Thomas' feedback.

	Sam