drm: kill drm_device->irq

Like the last patch but adds a macro to get at the irq value instead of
dereferencing pdev directly.  Should  make things easier for the BSD guys and
if we ever support non-PCI devices.

Signed-off-by:  Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index d0c13d9..4091b9e 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -228,12 +228,9 @@
 	if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
 		sh_flags = IRQF_SHARED;
 
-	ret = request_irq(dev->pdev->irq, dev->driver->irq_handler,
+	ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler,
 			  sh_flags, dev->devname, dev);
-	/* Expose the device irq number to drivers that want to export it for
-	 * whatever reason.
-	 */
-	dev->irq = dev->pdev->irq;
+
 	if (ret < 0) {
 		mutex_lock(&dev->struct_mutex);
 		dev->irq_enabled = 0;