[PATCH v6 04/18] drm/i915/hdcp: No HDCP when encoder is't initialized

[Ramalingam C]

On 2020-11-26 at 13:07:08 +0530, Anshuman Gupta wrote:
> There can be situation when DP MST connector is created without
> mst modeset being done, in those cases connector->encoder will be
> NULL. MST connector->encoder initializes after modeset.

This patch is to reject the HDCP request on MST connector without
encoder initialized(modeset). But userspace are not supposed to request hdcp at such
scenario right?.

Ram

> Don't enable HDCP in such cases to prevent any crash.
> 
> Cc: Ramalingam C <ramalingam.c at intel.com>
> Cc: Juston Li <juston.li at intel.com>
> Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_hdcp.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index b9d8825e2bb1..7d63e9495956 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -2106,6 +2106,12 @@ int intel_hdcp_enable(struct intel_connector *connector,
>  	if (!hdcp->shim)
>  		return -ENOENT;
>  
> +	if (!connector->encoder) {
> +		drm_err(&dev_priv->drm, "[%s:%d] encoder is not initialized\n",
> +			connector->base.name, connector->base.base.id);
> +		return -ENODEV;
> +	}
> +
>  	mutex_lock(&hdcp->mutex);
>  	mutex_lock(&dig_port->hdcp_mutex);
>  	drm_WARN_ON(&dev_priv->drm,
> -- 
> 2.26.2
>