drm/i915: fix hpd work vs. flush_work in the pageflip code deadlock

[karo-tx-linux.git] / drivers / gpu / drm / i915 / i915_irq.c

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 4c6853f57d6292bc875892f10c074b5ac5acbfa9..9e48cf27db5e7f7f660b056d4142dcbf72b9637f 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1027,8 +1027,13 @@ static inline void intel_hpd_irq_handler(struct drm_device *dev,
                dev_priv->display.hpd_irq_setup(dev);
        spin_unlock(&dev_priv->irq_lock);
 
-       queue_work(dev_priv->wq,
-                  &dev_priv->hotplug_work);
+       /*
+        * Our hotplug handler can grab modeset locks (by calling down into the
+        * fb helpers). Hence it must not be run on our own dev-priv->wq work
+        * queue for otherwise the flush_work in the pageflip code will
+        * deadlock.
+        */
+       schedule_work(&dev_priv->hotplug_work);
 }
 
 static void gmbus_irq_handler(struct drm_device *dev)