drm/amdgpu: take the mode_config mutex when handling hpds

Since we may modify display state.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
index 2187960baf7c..b4d36f0f2153 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
@@ -59,10 +59,12 @@ static void amdgpu_hotplug_work_func(struct work_struct *work)
         struct drm_mode_config *mode_config = &dev->mode_config;
         struct drm_connector *connector;
 
+        mutex_lock(&mode_config->mutex);
         if (mode_config->num_connector) {
                 list_for_each_entry(connector, &mode_config->connector_list, head)
                         amdgpu_connector_hotplug(connector);
         }
+        mutex_unlock(&mode_config->mutex);
         /* Just fire off a uevent and let userspace tell us what to do */
         drm_helper_hpd_irq_event(dev);
 }