If a HDCP repeater is detected with zero hdcp authenticated
downstream devices, there are two option as below:

1. Dont continue on second stage authentication. Disable encryption.
2. Continue with second stage authentication excluding the KSV list and
   continue encryption on success.

This patch adopts the option 1.

Signed-off-by: Ramalingam C <ramalinga...@intel.com>
---
 drivers/gpu/drm/i915/intel_hdcp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_hdcp.c 
b/drivers/gpu/drm/i915/intel_hdcp.c
index 0021511ae4d7..182a3c8a4e4a 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -175,10 +175,10 @@ int intel_hdcp_auth_downstream(struct intel_connector 
*connector)
                return -EPERM;
        }
 
-       /* If there are no downstream devices, we're all done. */
+       /* If there are no downstream devices, we're not encrypting. */
        num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]);
        if (num_downstream == 0)
-               return 0;
+               return -EINVAL;
 
        ksv_fifo = kzalloc(num_downstream * DRM_HDCP_KSV_LEN, GFP_KERNEL);
        if (!ksv_fifo)
-- 
2.7.4

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