video: tegra: dc: hdcp: handle the case of DEVICE_COUNT = 0 properly

When HDCP repeater has no device attached, DEVICE_COUNT reports back as 0.
HDCP driver should handle this case as a good case and continue downstream
authentication, other than fail it.

Change-Id: Ied2e46428c0247f14fbd96016cd4fdbf358f6587

diff --git a/drivers/video/tegra/dc/nvhdcp.c b/drivers/video/tegra/dc/nvhdcp.c
index 7c8869a563f55578901eec1df8ad636c0a436e4a..5c2d9050a14b92128d28ec1b50a996b2d258b19b 100644 (file)
--- a/drivers/video/tegra/dc/nvhdcp.c
+++ b/drivers/video/tegra/dc/nvhdcp.c
@@ -354,6 +354,9 @@ static int get_ksvfifo(struct tegra_nvhdcp *nvhdcp,
        if (!ksv_list || num_bksv_list > TEGRA_NVHDCP_MAX_DEVS)
                return -EINVAL;
 
+       if (num_bksv_list == 0)
+               return 0;
+
        buf = kmalloc(buf_len, GFP_KERNEL);
        if (IS_ERR_OR_NULL(buf))
                return -ENOMEM;