[PATCH] drm/irq: Add irq as false detection

[Tian Tao]

Add the detection of false for irq, so that the EINVAL is not
returned when dev->irq_enabled is false.

Signed-off-by: Tian Tao <tiantao6 at hisilicon.com>
---
 drivers/gpu/drm/drm_irq.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 09d6e9e..7537a3d 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -172,6 +172,9 @@ int drm_irq_uninstall(struct drm_device *dev)
 	bool irq_enabled;
 	int i;
 
+	if (!dev->irq_enabled || !dev)
+		return 0;
+
 	irq_enabled = dev->irq_enabled;
 	dev->irq_enabled = false;
 
-- 
2.7.4