1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 23d1ae67d279..02f96fd0d52d 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -306,12 +306,15 @@ static void i915_hotplug_work_func(struct work_struct *work)
         struct drm_mode_config *mode_config = &dev->mode_config;
         struct intel_encoder *encoder;
 
+        mutex_lock(&mode_config->mutex);
         DRM_DEBUG_KMS("running encoder hotplug functions\n");
 
         list_for_each_entry(encoder, &mode_config->encoder_list, base.head)
                 if (encoder->hot_plug)
                         encoder->hot_plug(encoder);
 
+        mutex_unlock(&mode_config->mutex);
+
         /* Just fire off a uevent and let userspace tell us what to do */
         drm_helper_hpd_irq_event(dev);
 }