From 61a669473f82cd5cac66146644b829b370c791ca Mon Sep 17 00:00:00 2001
From: Zhenyu Wang <zhenyuw@linux.intel.com>
Date: Mon, 15 Jan 2018 16:36:12 +0800
Subject: [PATCH] drm/i915/gvt: cancel scheduler timer when no vGPU exists
Git-commit: 61a669473f82cd5cac66146644b829b370c791ca
Patch-mainline: v4.16-rc1
References: FATE#322643 bsc#1055900

Stop gvt scheduler timer if no vGPU exists, otherwise it keeps
gvt service thread busy to handle request schedule event but no
actual schedule activity required.

Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/gvt/sched_policy.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/gpu/drm/i915/gvt/sched_policy.c
+++ b/drivers/gpu/drm/i915/gvt/sched_policy.c
@@ -308,8 +308,15 @@ static int tbs_sched_init_vgpu(struct in
 
 static void tbs_sched_clean_vgpu(struct intel_vgpu *vgpu)
 {
+	struct intel_gvt *gvt = vgpu->gvt;
+	struct gvt_sched_data *sched_data = gvt->scheduler.sched_data;
+
 	kfree(vgpu->sched_data);
 	vgpu->sched_data = NULL;
+
+	/* this vgpu id has been removed */
+	if (idr_is_empty(&gvt->vgpu_idr))
+		hrtimer_cancel(&sched_data->timer);
 }
 
 static void tbs_sched_start_schedule(struct intel_vgpu *vgpu)