drm/i915/gvt: Don't submit request for error workload dispatch

As vGPU shadow ctx is loaded with guest context state, arbitrarily
submitting request in error workload dispatch path would cause trouble.
So don't try to submit in error path now like in previous code.
This is to fix VM failure when GPU hang happens.

Fixes: f0e994372518 ("drm/i915/gvt: Fix workload request allocation before request add")
Reviewed-by: Xiong Zhang <xiong.y.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c
index af97df10495ed872463d9010677a04f4bdd11b87..817d46f25f098efc2aac81d6ed5d3ca278066c58 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/scheduler.c
+++ b/drivers/gpu/drm/i915/gvt/scheduler.c
@@ -677,6 +677,7 @@ static int dispatch_workload(struct intel_vgpu_workload *workload)
 {
        struct intel_vgpu *vgpu = workload->vgpu;
        struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
+       struct i915_request *rq;
        int ring_id = workload->ring_id;
        int ret;
 
@@ -702,6 +703,14 @@ static int dispatch_workload(struct intel_vgpu_workload *workload)
 
        ret = prepare_workload(workload);
 out:
+       if (ret) {
+               /* We might still need to add request with
+                * clean ctx to retire it properly..
+                */
+               rq = fetch_and_zero(&workload->req);
+               i915_request_put(rq);
+       }
+
        if (!IS_ERR_OR_NULL(workload->req)) {
                gvt_dbg_sched("ring id %d submit workload to i915 %p\n",
                                ring_id, workload->req);