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

[Sam Ravnborg <sam@ravnborg.org>]

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@hisilicon.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