[Intel-gfx] drm/i915: Acquire connector reference before prop_work

[Kamati Srinivas]

From: Srinivas Kamati <srinivasx.k at intel.com>

"Content protection type change" igt test results in kernel
taint. Everytime after prop_work is done we are also
giving up connector reference, which is resulting in ref
count underrun.

Before scheduling prop_work acquire connector reference.

Cc: Sean Paul <seanpaul at chromium.org>
Cc: Ramalingam C <ramalingam.c at intel.com>
Signed-off-by: Srinivas Kamati <srinivasx.k at intel.com>
---
 drivers/gpu/drm/i915/display/intel_hdcp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index b2a4bbcfdcd2..beedd672b21e 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -2210,6 +2210,7 @@ void intel_hdcp_update_pipe(struct intel_atomic_state *state,
 	if (content_protection_type_changed) {
 		mutex_lock(&hdcp->mutex);
 		hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
+		drm_connector_get(&connector->base);
 		schedule_work(&hdcp->prop_work);
 		mutex_unlock(&hdcp->mutex);
 	}
-- 
2.25.1