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

[Thierry Reding]

On Fri, Apr 11, 2014 at 11:36:07PM +0200, 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 at gmail.com>
> Signed-off-by: Daniel Vetter <daniel.vetter at 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);
> +

This looks odd...

>  	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
>  		return -EINVAL;
>  
> -	if (drm_dev_to_irq(dev) == 0)
> +	if (irq == 0)
>  		return -EINVAL;

Wouldn't it make more sense to assign irq only here? And while at it,
perhaps you meant to store irq directly within dev->irq, rather than in
a local variable? That would address Laurent's comment as well.

>  
>  	/* 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;
>  	}

But perhaps you really only want to assign it after it's been properly
initialized, so I guess the local variable is fine. But in that case you
probably need to make sure to not use dev->irq until after this
assignment.

Thierry
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