From a172ee2a18b715a6de9b8e914aecd8414a4f3b2d Mon Sep 17 00:00:00 2001
From: Eric Anholt <anholt@freebsd.org>
Date: Sat, 26 Apr 2003 23:04:22 +0000
Subject: [PATCH] MFL: Don't install irq handler unless the driver has been
 initialized.

---
 bsd-core/drm_dma.c | 3 +++
 bsd/drm_dma.h      | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/bsd-core/drm_dma.c b/bsd-core/drm_dma.c
index 526faee2..10c26e37 100644
--- a/bsd-core/drm_dma.c
+++ b/bsd-core/drm_dma.c
@@ -160,6 +160,9 @@ int DRM(irq_install)( drm_device_t *dev, int irq )
 	if ( !irq )
 		return DRM_ERR(EINVAL);
 
+	if (dev->dev_private == NULL)
+		return DRM_ERR(EINVAL);
+
 	DRM_LOCK;
 	if ( dev->irq ) {
 		DRM_UNLOCK;
diff --git a/bsd/drm_dma.h b/bsd/drm_dma.h
index 526faee2..10c26e37 100644
--- a/bsd/drm_dma.h
+++ b/bsd/drm_dma.h
@@ -160,6 +160,9 @@ int DRM(irq_install)( drm_device_t *dev, int irq )
 	if ( !irq )
 		return DRM_ERR(EINVAL);
 
+	if (dev->dev_private == NULL)
+		return DRM_ERR(EINVAL);
+
 	DRM_LOCK;
 	if ( dev->irq ) {
 		DRM_UNLOCK;