drm: Allow vblank support without DRIVER_HAVE_IRQ

Drivers that register interrupt handlers without the DRM core helpers
don't initialize the .irq_enabled field and drm_dev_to_irq() may fail
when called on them. This shouldn't preclude them from implementing
the vblank IOCTL.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 19c01ca3cc76..71f820565637 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -1218,8 +1218,9 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
         int ret;
         unsigned int flags, seq, crtc, high_crtc;
 
-        if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled))
-                return -EINVAL;
+        if (drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+                if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled))
+                        return -EINVAL;
 
         if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
                 return -EINVAL;