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| author |   Chuanxiao Dong <chuanxiao.dong@intel.com> | 2017-02-17 19:29:52 +0800 |
|---|---|---|
| committer |   Zhenyu Wang <zhenyuw@linux.intel.com> | 2017-02-23 17:32:13 +0800 |
| commit | 9272f73f79bd780502134f227fa52fd280ecda17 (patch) | |
| tree | d8596485a231f43d6b9b2389dbe2abaf53f56923 /drivers/gpu/drm | |
| parent | drm/i915/gvt: enter failsafe mode when guest requires more resources (diff) | |
| download | linux-dev-9272f73f79bd780502134f227fa52fd280ecda17.tar.xz linux-dev-9272f73f79bd780502134f227fa52fd280ecda17.zip | |
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>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/i915/gvt/scheduler.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c index d6b6d0efdd1a..e355a82ccabd 100644 --- a/drivers/gpu/drm/i915/gvt/scheduler.c +++ b/drivers/gpu/drm/i915/gvt/scheduler.c @@ -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, |