Commit 9272f73f authored Feb 17, 2017 by Chuanxiao Dong Committed by Zhenyu Wang Feb 23, 2017

drm/i915/gvt: add a NULL pointer check to avoid kernel panic



Due to the request replay, context switch interrupt may come after
gvt free the workload thus can cause a kernel NULL pointer kernel
panic. This patch will add a simple check to avoid this for a short
term.

From long term, gvt workload lifecycle doesn't match with i915 request
and need to find a proper way to manage this.

v4: simplify the NULL pointer check.
v5: add unlikely to optimize.

Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

parent a33fc7a0

drivers/gpu/drm/i915/gvt/scheduler.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -139,6 +139,9 @@ static int shadow_context_status_change(struct notifier_block *nb,
		struct intel_vgpu_workload *workload =
		scheduler->current_workload[req->engine->id];

		if (unlikely(!workload))
		return NOTIFY_OK;

		switch (action) {
		case INTEL_CONTEXT_SCHEDULE_IN:
		intel_gvt_load_render_mmio(workload->vgpu,