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drm/i915: protect ringbuffer sarea update behind !MODESET 

Avoids surprises when userspace races open/closes against this.

Cc: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
hifive-unleashed-5.1
Daniel Vetter 2014-02-12 23:44:34 +01:00
parent 1fcb195e90
commit fb19e2ac7c
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -1513,7 +1513,8 @@ static int ring_wait_for_space(struct intel_ring_buffer *ring, int n)
return 0;
}
if (dev->primary->master) {
if (!drm_core_check_feature(dev, DRIVER_MODESET) &&
dev->primary->master) {
struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
if (master_priv->sarea_priv)
master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;