[Intel-gfx] [PATCH] drm/i915: intel_audio clear eld buf when disconnecting monitor

[libin.yang at linux.intel.com]

From: Libin Yang <libin.yang at linux.intel.com>

When disconnecting monitor, dev_priv->dig_port_map[port]
will be set NULL, which causes eld will not be updated in
i915_audio_component_get_eld().

This patch clears the eld buf when dev_priv->dig_port_map[port]
is NULL.

Signed-off-by: Libin Yang <libin.yang at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_audio.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
index fdc8b2a..9d3879e 100644
--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -732,6 +732,13 @@ static int i915_audio_component_get_eld(struct device *dev, int port,
 			ret = drm_eld_size(eld);
 			memcpy(buf, eld, min(max_bytes, ret));
 		}
+	} else {
+		/* dev_priv->dig_port_map[port] will be set NULL in
+		 * intel_audio_codec_disable when disconnecting monitor.
+		 * We need clear the eld buf.
+		 */
+		memset(buf, 0, max_bytes);
+		ret = 0;
 	}
 
 	mutex_unlock(&dev_priv->av_mutex);
-- 
1.9.1