drm/radeon: take the mode_config mutex when dealing with hpds (v2)

commit 39fa10f7e21574a70cecf1fed0f9b36535aa68a0 upstream.

Since we are messing with state in the worker.

v2: drop the changes in the mst worker

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Zefan Li <lizefan@huawei.com>

diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index 645dcbf6490b199a50752ecb4ae630b1119de9a4..77c456d624bf60cd37a33fae249ce6f2ba65a8b2 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -51,10 +51,12 @@ static void radeon_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)
                        radeon_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);
 }