[PATCH 4.17 093/336] drm/amd/display: Do not program interrupt status on disabled crtc

[Greg Kroah-Hartman]

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mikita Lipski <mikita.lipski@xxxxxxx>

[ Upstream commit 4ea7fc09539bd2399c1fa7acea14529406120d9e ]

Prevent interrupt programming of a crtc on which the stream is disabled and
it doesn't have an OTG to reference.

Signed-off-by: Mikita Lipski <mikita.lipski@xxxxxxx>
Reviewed-by: Harry Wentland <Harry.Wentland@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c
@@ -555,6 +555,9 @@ static inline int dm_irq_state(struct am
 		return 0;
 	}
 
+	if (acrtc->otg_inst == -1)
+		return 0;
+
 	irq_source = dal_irq_type + acrtc->otg_inst;
 
 	st = (state == AMDGPU_IRQ_STATE_ENABLE);