[PATCH] drm/irq: simplify irq checks in drm_wait_vblank

[Daniel Vetter]

Checking for both an irq number _and_ whether it's enabled is
redundant. Originally I've thought the drm_dev_to_irq call would break
drivers which do their own irq checking, but those shouldn't have
DRIVER_HAVE_IRQ set as Thierry Reding pointed out. But such drivers
already need to set dev->irq_enabled for other reasons, so we might as
well ditch that check, too.

v2: Also drop the HAVE_IRQ check.

Cc: Thierry Reding <thierry.reding at gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/drm_irq.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index c0c6bdedefef..f83e72cd5215 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -1185,9 +1185,8 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
 	int ret;
 	unsigned int flags, seq, crtc, high_crtc;
 
-	if (drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
-		if ((!drm_dev_to_irq(dev)) || (!dev->irq_enabled))
-			return -EINVAL;
+	if (!dev->irq_enabled)
+		return -EINVAL;
 
 	if (vblwait->request.type & _DRM_VBLANK_SIGNAL)
 		return -EINVAL;
-- 
1.8.4.3