[PATCH RESEND] drm/amdgpu: error out on entity with no run queue

[Nirmoy Das]

Disabled HW IP's entity initialized with NULL rq. We should not
process any submit request from userspace for a disabled HW IP.

Signed-off-by: Nirmoy Das <nirmoy.das at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 614919f265b9..943e6075bdf9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -913,6 +913,11 @@ static int amdgpu_cs_ib_fill(struct amdgpu_device *adev,
 		if (parser->entity && parser->entity != entity)
 			return -EINVAL;
 
+		/* Return if there is no run queue associated with this entity.
+		 * Possibly because of disabled HW IP*/
+		if (entity->rq == NULL)
+			return -EINVAL;
+
 		parser->entity = entity;
 
 		ring = to_amdgpu_ring(entity->rq->sched);
-- 
2.24.1