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 3b03f85ea627..9da2a2c99953 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -306,6 +306,7 @@ 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)
@@ -314,6 +315,8 @@ static void i915_hotplug_work_func(struct work_struct *work)
 
         /* Just fire off a uevent and let userspace tell us what to do */
         drm_helper_hpd_irq_event(dev);
+
+        mutex_unlock(&mode_config->mutex);
 }
 
 static void i915_handle_rps_change(struct drm_device *dev)