3.13.11-ckt34 -stable review patch.  If anyone has any objections, please let 
me know.

---8<------------------------------------------------------------

From: Ben Skeggs <[email protected]>

commit 0a882cadbc63fd2da3994af7115b4ada2fcbd638 upstream.

fdo#93634

Signed-off-by: Ben Skeggs <[email protected]>
[ kamal: backport to 3.13-stable: context ]
Signed-off-by: Kamal Mostafa <[email protected]>
---
 drivers/gpu/drm/nouveau/nouveau_connector.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c 
b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 1674882..40bd3ae 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -925,10 +925,12 @@ nouveau_connector_hotplug_work(struct work_struct *work)
        NV_DEBUG(drm, "%splugged %s\n", plugged ? "" : "un",
                 drm_get_connector_name(connector));
 
+       mutex_lock(&drm->dev->mode_config.mutex);
        if (plugged)
                drm_helper_connector_dpms(connector, DRM_MODE_DPMS_ON);
        else
                drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
+       mutex_unlock(&drm->dev->mode_config.mutex);
 
        drm_helper_hpd_irq_event(dev);
 }
-- 
1.9.1

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