On Wed, Apr 29, 2020 at 9:46 AM Ramalingam C wrote:
>
> drm_hdcp_check_ksvs_revoked() returns the number of revoked keys and
> error codes when the SRM parsing is failed.
>
> Errors in SRM parsing can't affect the HDCP auth, hence with this patch,
> I915 will look out for revoked key count alone.
>
Reviewed-by: Sean Paul
> Signed-off-by: Ramalingam C
> cc: Sean Paul
> ---
> drivers/gpu/drm/i915/display/intel_hdcp.c | 8
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c
> b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index 2cbc4619b4ce..96bf6def9830 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -576,7 +576,7 @@ int intel_hdcp_auth_downstream(struct intel_connector
> *connector)
> goto err;
>
> if (drm_hdcp_check_ksvs_revoked(_priv->drm, ksv_fifo,
> - num_downstream)) {
> + num_downstream) > 0) {
> drm_err(_priv->drm, "Revoked Ksv(s) in ksv_fifo\n");
> ret = -EPERM;
> goto err;
> @@ -682,7 +682,7 @@ static int intel_hdcp_auth(struct intel_connector
> *connector)
> if (ret < 0)
> return ret;
>
> - if (drm_hdcp_check_ksvs_revoked(_priv->drm, bksv.shim, 1)) {
> + if (drm_hdcp_check_ksvs_revoked(_priv->drm, bksv.shim, 1) > 0) {
> drm_err(_priv->drm, "BKSV is revoked\n");
> return -EPERM;
> }
> @@ -1283,7 +1283,7 @@ static int hdcp2_authentication_key_exchange(struct
> intel_connector *connector)
>
> if (drm_hdcp_check_ksvs_revoked(_priv->drm,
> msgs.send_cert.cert_rx.receiver_id,
> - 1)) {
> + 1) > 0) {
> drm_err(_priv->drm, "Receiver ID is revoked\n");
> return -EPERM;
> }
> @@ -1484,7 +1484,7 @@ int hdcp2_authenticate_repeater_topology(struct
> intel_connector *connector)
> HDCP_2_2_DEV_COUNT_LO(rx_info[1]));
> if (drm_hdcp_check_ksvs_revoked(_priv->drm,
> msgs.recvid_list.receiver_ids,
> - device_cnt)) {
> + device_cnt) > 0) {
> drm_err(_priv->drm, "Revoked receiver ID(s) is in
> list\n");
> return -EPERM;
> }
> --
> 2.20.1
>
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