The update is horribly racy since it doesn't protect at all against
concurrent closing of the master fd. And it can't really since that
requires us to grab a mutex.
Instead of jumping through hoops and offloading this to a worker
thread just block this bit of code for the modesetting driver.
Reported-by: Eugene Shatokhin <eugene.shatok...@rosalab.ru>
Cc: Eugene Shatokhin <eugene.shatok...@rosalab.ru>
Cc: sta...@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch>
---
drivers/gpu/drm/i915/i915_dma.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 197db0993a24..0a42e2f7bcf8 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -83,6 +83,9 @@ void i915_update_dri1_breadcrumb(struct drm_device *dev)
drm_i915_private_t *dev_priv = dev->dev_private;
struct drm_i915_master_private *master_priv;
+ if (drm_core_check_feature(dev, DRIVER_MODESET))
+ return;
+
if (dev->primary->master) {
master_priv = dev->primary->master->driver_priv;
if (master_priv->sarea_priv)
--
1.8.4.3
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