Re: [PATCH 10/18] drm/irq: track the irq installed in drm_irq_install in dev->irq

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

And another comment...

On Friday 11 April 2014 23:36:07 Daniel Vetter wrote:
> To get rid of the dev->bus->get_irq callback we need to pass in the
> desired irq explicitly into drm_irq_install. To avoid having to do the
> same for drm_irq_unistall just track it internally. That leaves
> drivers with less room to botch things up.
> 
> v2: Add the hunk lost in an earlier patch to this one (Thierry).
> 
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
>  drivers/gpu/drm/drm_irq.c | 18 +++++++++++-------
>  include/drm/drmP.h        |  2 ++
>  2 files changed, 13 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index 330e85b19115..1c3b6229363d 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -249,14 +249,16 @@ static inline int drm_dev_to_irq(struct drm_device
> *dev) */
>  int drm_irq_install(struct drm_device *dev)
>  {
> -	int ret;
> +	int ret, irq;
>  	unsigned long sh_flags = 0;
>  	char *irqname;
> 
> +	irq = drm_dev_to_irq(dev);
> +
>  	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
>  		return -EINVAL;
> 
> -	if (drm_dev_to_irq(dev) == 0)
> +	if (irq == 0)

Isn't 0 a valid IRQ number ? Shouldn't you check for irq < 0 instead ? At 
least platform_get_irq() returns a negative error value on failure.

>  		return -EINVAL;
> 
>  	/* Driver must have been initialized */
> @@ -267,7 +269,7 @@ int drm_irq_install(struct drm_device *dev)
>  		return -EBUSY;
>  	dev->irq_enabled = true;
> 
> -	DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
> +	DRM_DEBUG("irq=%d\n", dev->irq);
> 
>  	/* Before installing handler */
>  	if (dev->driver->irq_preinstall)
> @@ -282,7 +284,7 @@ int drm_irq_install(struct drm_device *dev)
>  	else
>  		irqname = dev->driver->name;
> 
> -	ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler,
> +	ret = request_irq(dev->irq, dev->driver->irq_handler,
>  			  sh_flags, irqname, dev);
> 
>  	if (ret < 0) {
> @@ -301,7 +303,9 @@ int drm_irq_install(struct drm_device *dev)
>  		dev->irq_enabled = false;
>  		if (!drm_core_check_feature(dev, DRIVER_MODESET))
>  			vga_client_register(dev->pdev, NULL, NULL, NULL);
> -		free_irq(drm_dev_to_irq(dev), dev);
> +		free_irq(dev->irq, dev);
> +	} else {
> +		dev->irq = irq;
>  	}
> 
>  	return ret;
> @@ -344,7 +348,7 @@ int drm_irq_uninstall(struct drm_device *dev)
>  	if (!irq_enabled)
>  		return -EINVAL;
> 
> -	DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));
> +	DRM_DEBUG("irq=%d\n", dev->irq);
> 
>  	if (!drm_core_check_feature(dev, DRIVER_MODESET))
>  		vga_client_register(dev->pdev, NULL, NULL, NULL);
> @@ -352,7 +356,7 @@ int drm_irq_uninstall(struct drm_device *dev)
>  	if (dev->driver->irq_uninstall)
>  		dev->driver->irq_uninstall(dev);
> 
> -	free_irq(drm_dev_to_irq(dev), dev);
> +	free_irq(dev->irq, dev);
> 
>  	return 0;
>  }
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 8b23a34a103e..6f512cd97cd5 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -1107,6 +1107,8 @@ struct drm_device {
>  	/** \name Context support */
>  	/*@{ */
>  	bool irq_enabled;		/**< True if irq handler is enabled */
> +	int irq;
> +
>  	__volatile__ long context_flag;	/**< Context swapping flag */
>  	int last_context;		/**< Last current context */
>  	/*@} */

-- 
Regards,

Laurent Pinchart